Search Sweep Of Oscillator Patents (Class 331/4)
  • Patent number: 9544864
    Abstract: Provided is a data transmission system, including: a transmitting device configured to transmit a data signal; a receiving device configured to receive the transmitted data signal; and a transmission path for transmitting the data signal, the receiving device including: a detection unit configured to detect a timing at which a polarity of the received data signal is inverted; a plurality of resistors to be selectively connected to a terminal side of the transmission path; and a switching unit configured to switch the plurality of resistors based on the detected timing, the switching unit being configured to select a resistor having a higher resistance value than a characteristic impedance of the transmission path, during a first period, which is a predetermined period from a time point at which the polarity is inverted, and to select, after the first period, a resistor having the same resistance value as the characteristic impedance.
    Type: Grant
    Filed: March 7, 2016
    Date of Patent: January 10, 2017
    Assignee: PANASONIC LIQUID CRYSTAL DISPLAY CO., LTD.
    Inventor: Kouji Takahashi
  • Patent number: 9490825
    Abstract: A circuit may include a digitally-controlled oscillator including a coarse frequency-tuning array with a multiple selectable coarse frequency-tuning segments. Each of the coarse frequency-tuning segments may have a coarse segment frequency step size. The digitally-controlled oscillator may also include a fine frequency-tuning array with multiple selectable fine frequency-tuning segments. The fine frequency-tuning array may have a fine array frequency step size that is at least twice the coarse segment frequency step size. The digitally-controlled oscillator may be configured to generate an output signal with a frequency based on the coarse frequency-tuning array and the fine frequency-tuning array.
    Type: Grant
    Filed: May 23, 2013
    Date of Patent: November 8, 2016
    Assignee: Intel IP Corporation
    Inventors: Claudio Rey, David Harnishfeger, Darin Nguyen
  • Patent number: 9395229
    Abstract: The present invention relates to a radar level gauge system comprising a signal propagation device; a microwave signal source; a microwave signal source controller; a mixer configured to combine a transmit signal from the microwave signal source and a reflection signal from the surface to form an intermediate frequency signal; and processing circuitry coupled to the mixer and configured to determine the filling level based on the intermediate frequency signal. The microwave signal source is configured to exhibit a phase noise greater than or equal to ?70 dBc/Hz @ 100 kHz offset from a carrier frequency for the transmit signal.
    Type: Grant
    Filed: March 5, 2014
    Date of Patent: July 19, 2016
    Assignee: ROSEMOUNT TANK RADAR AB
    Inventors: Anders Jirskog, Mikael Kleman, Lars Ove Larsson
  • Patent number: 9366706
    Abstract: A system for sensing human activity by monitoring impedance includes a signal generator for generating an alternating current (AC) signal, the AC signal applied to an object, a reactance altering element coupled to the AC signal, an envelope generator for converting a returned AC signal to a time-varying direct current (DC) signal, and an analog-to-digital converter for determining a defined impedance parameter of the time-varying DC signal, where the defined impedance parameter defines an electromagnetic resonant attribute of the object.
    Type: Grant
    Filed: December 26, 2012
    Date of Patent: June 14, 2016
    Assignee: Disney Enterprises, Inc.
    Inventors: Ivan Poupyrev, Zhiquan Yeo, Jonas Loh
  • Patent number: 9128496
    Abstract: A method for increasing the accuracy of a time-domain apparatus comprising the following steps: initiating a periodic oscillation with the time-domain apparatus; measuring time intervals between trigger events during each oscillation, wherein the trigger events correspond to the oscillation passing known values; detecting a perturbation to the oscillation by monitoring changes in the time intervals between trigger events; and adjusting a parameter of the oscillation based on the perturbation such that measurement error is reduced.
    Type: Grant
    Filed: June 18, 2013
    Date of Patent: September 8, 2015
    Assignee: The United States of America as represented by Secretary of the Navy
    Inventors: Richard L. Waters, Paul David Swanson
  • Patent number: 8964880
    Abstract: In an embodiment of the invention, a frequency divider in a phase-locked loop (PLL) circuit is provided power from the power supply that provides power to a transmission circuit. The PLL is configured to receive a first direct current (DC) reference voltage, a second DC voltage and a reference clock signal. The PLL is configured to generate a transmission clock signal. A transmission circuit is configured to receive the transmission clock signal, the second DC voltage and a data bus where the data bus includes a plurality of data bits in parallel. The transmission circuit transmits data serially.
    Type: Grant
    Filed: July 11, 2012
    Date of Patent: February 24, 2015
    Assignee: Texas Instruments Incorporated
    Inventors: Vishnu Ravinuthula, Dushmantha Rajapaksha, Hugh Mair
  • Patent number: 8441217
    Abstract: With an oscillator circuit with a frequency sweep function, a first counter counts a reference clock for a number of counts that corresponds to a digital first setting signal, and generates a first count completion signal which is asserted on completion of the count. A D/A converter converts a digital second setting signal into an analog control voltage. A VCO oscillates with a frequency according to the control voltage. When the first count completion signal is asserted, the VCO is reset. An output combining unit receives the output signal of the VCO, generates the output signal of the oscillator circuit, and generates the first setting signal and the second setting signal.
    Type: Grant
    Filed: August 9, 2010
    Date of Patent: May 14, 2013
    Assignee: Rohm Co., Ltd.
    Inventor: Hisashi Sugie
  • Patent number: 8175199
    Abstract: A wireless receiver realizes multi-band and multi-mode operations while reducing power consumption of a local oscillator. The receiver includes the local oscillator for discontinuously changing a band of a local oscillation signal corresponding to a frequency band of an RF signal to be received and outputting the local oscillation signal, a frequency converter for converting the RF signal into an IF signal by using the local oscillation signal, and a demodulator for demodulating the IF signal. The local oscillator detects a frequency variation range of the local oscillation signal, obtains a frequency equivalent to an integral multiple of a symbol rate from the frequency variation range, and outputs the local oscillation signal having a local oscillatory frequency, causing a center frequency of a channel to be received, which channel is included in the intermediate frequency signal, to be equivalent to the integral multiple of the symbol rate.
    Type: Grant
    Filed: June 15, 2006
    Date of Patent: May 8, 2012
    Assignee: Panasonic Corporation
    Inventor: Toshifumi Nakatani
  • Patent number: 8085097
    Abstract: An integrated ramp, sweep fractional frequency synthesizer system on an integrated circuit chip includes an integrated circuit chip having a fractional frequency synthesizer with a fractional divider responsive to a VCO and a ?? modulator for modifying the divisor of the fractional divider; and a ramp generator on the same integrated circuit chip; the ramp generator being responsive to a trigger signal to generate a ramp for sweeping the frequency of said fractional frequency synthesizer.
    Type: Grant
    Filed: May 4, 2009
    Date of Patent: December 27, 2011
    Assignee: Hittite Microwave Corporation
    Inventors: Mark M. Cloutier, Tudor Lipan
  • Patent number: 8018294
    Abstract: An oscillator device includes an oscillation system having an oscillator and an elastic supporting member, a detecting member for detecting oscillation amplitude of the oscillator, a driving member for driving the oscillator, and a control unit for generating a driving signal for driving the oscillator and for supplying the driving signal to the driving member, wherein the control unit reciprocally sweeps a driving frequency of the driving signal so that a resonance frequency of the oscillation system is included within a frequency range swept, wherein the control unit determines a resonance frequency based on at least two frequencies with which an oscillation amplitude value obtainable by the reciprocal sweeping reaches a maximum, and wherein the control unit generates the driving signal based on the determined resonance frequency.
    Type: Grant
    Filed: May 13, 2008
    Date of Patent: September 13, 2011
    Assignee: Canon Kabushiki Kaisha
    Inventor: Ikuo Watanabe
  • Patent number: 8004197
    Abstract: A collector sweeping method for controlling an electron beam in a beam collector, in particular of a magnetic gyrotron device, comprises the steps of subjecting the electron beam to a transversal sweeping field having a field component perpendicular to a longitudinal direction (z) of the beam collector and providing a tilted, rotating intersection area of the electron beam in the beam collector, and varying at least one of a longitudinal position and a tilting angle of the intersection area by a modulation of the transversal sweeping field. Furthermore, a collector sweeping apparatus and a microwave generator are described.
    Type: Grant
    Filed: May 4, 2007
    Date of Patent: August 23, 2011
    Assignees: Max-Planck-Gesellschaft zur Förderung der Wissenschaften e.V., Karlsruher Institut für Technologie
    Inventors: Volker Erckmann, Günter Dammertz, Martin Schmid
  • Patent number: 7986193
    Abstract: Disclosed is a system and method for providing an oscillating signal of relatively precise frequency without using a signal provided by a crystal as a reference. Disclosed is a feedback oscillator circuit configured to output an oscillating signal having a frequency defined by a reference signal. The oscillating signal can be sent to one or more circuits including at least one frequency sensitive element. The frequency sensitive element produces an output signal which depends on the frequency of the oscillating signal. A controller controls the reference signal in order to cause an attribute of the output signal to have a value within a desired range.
    Type: Grant
    Filed: January 3, 2007
    Date of Patent: July 26, 2011
    Assignee: Apple Inc.
    Inventor: Christoph Horst Krah
  • Patent number: 7800451
    Abstract: A fractional-N divider receives an input signal and supplies a divided signal divided in accordance with an integer divide control signal determined from a divide ratio. A phase interpolator is coupled to the fractional-N divider to adjust a phase of the divided signal according to a fractional portion of the divide ratio. The apparatus, responsive to a request for a frequency adjustment of the generated signal in a programmable number of steps, is configured to adjust the frequency of the generated signal from a beginning frequency to an ending frequency in the programmable number of steps by adjusting the supplied divide ratio at each step.
    Type: Grant
    Filed: September 23, 2008
    Date of Patent: September 21, 2010
    Assignee: Silicon Laboratories Inc.
    Inventors: Zhuo Fu, Vivek Sarda, Pio Balmelli
  • Patent number: 7622872
    Abstract: An actuator driving apparatus comprises the following. A start signal generator generates a start signal having a frequency substantially equal to the resonance frequency of the movable portion of an actuator. A rock detector detects rock of the movable portion. A drive timing signal generator generates a drive timing signal based on the output of the rock detector. A switch is connected to the start signal generator and drive timing signal generator for selectively transmitting their outputs to a section arranged in a subsequent stage. A drive signal generator generates a drive signal based on the output of the switch, and supplies it to the actuator. A superposition preventing section prevents a frequency component of a frequency substantially equal to the resonance frequency from being superposed upon the output of the rock detector. The apparatus performs driving according to the rocking state of the movable portion, by switching the switch.
    Type: Grant
    Filed: July 23, 2007
    Date of Patent: November 24, 2009
    Assignee: Olympus Corporation
    Inventor: Masahiro Nishio
  • Publication number: 20090278611
    Abstract: An integrated ramp, sweep fractional frequency synthesizer system on an integrated circuit chip includes an integrated circuit chip having a fractional frequency synthesizer with a fractional divider responsive to a VCO and a ?? modulator for modifying the divisor of the fractional divider; and a ramp generator on the same integrated circuit chip; the ramp generator being responsive to a trigger signal to generate a ramp for sweeping the frequency of said fractional frequency synthesizer.
    Type: Application
    Filed: May 4, 2009
    Publication date: November 12, 2009
    Inventors: Mark M. Cloutier, Tudor Lipan
  • Patent number: 7545847
    Abstract: A frequency synthesizer applied to a frequency hopping system includes a voltage controlled oscillator (VCO), a phase lock loop (PLL) system, a second frequency divider, a first SSB mixer, a second SSB mixer, and a multiplexer. The VCO generates an oscillating frequency. The PLL system includes a first frequency divider and divides the oscillating frequency by 10 to generate a first dividing signal. The second frequency divider divides the oscillating frequency by 2 to generate a second dividing signal and further divides the second dividing signal by 2 to generate a third dividing signal. The first SSB mixer mixes frequencies of the second and third dividing signals to generate a first mixing signal. The second SSB mixer mixes frequencies of the first mixing signal and the first dividing signal to generate a second mixing signal. The Multiplexer determines to output the first mixing signal or the second mixing signal.
    Type: Grant
    Filed: July 6, 2007
    Date of Patent: June 9, 2009
    Assignee: Alcor Micro, Corp.
    Inventors: Chi-Tung Chang, Chih-Hao Lai, Chieh-Tsao Hwang
  • Publication number: 20080284523
    Abstract: An oscillator device includes an oscillation system having an oscillator and an elastic supporting member, a detecting member for detecting oscillation amplitude of the oscillator, a driving member for driving the oscillator, and a control unit for generating a driving signal for driving the oscillator and for supplying the driving signal to the driving member, wherein the control unit reciprocally sweeps a driving frequency of the driving signal so that a resonance frequency of the oscillation system is included within a frequency range swept, wherein the control unit determines a resonance frequency based on at least two frequencies with which an oscillation amplitude value obtainable by the reciprocal sweeping reaches a maximum, and wherein the control unit generates the driving signal based on the determined resonance frequency.
    Type: Application
    Filed: May 13, 2008
    Publication date: November 20, 2008
    Applicant: CANON KABUSHIKI KAISHA
    Inventor: Ikuo Watanabe
  • Patent number: 7449876
    Abstract: A synthetic test system for swept-frequency measurements that has a clock synchronization device to enable test boxes and devices that form the synthetic test system to have a common sense of time when conducting swept-frequency tests.
    Type: Grant
    Filed: May 3, 2006
    Date of Patent: November 11, 2008
    Assignee: Agilent Technologies, Inc.
    Inventors: Daniel Lee Pleasant, Duaine C. Wood, Joseph M. Gorin
  • Patent number: 7439815
    Abstract: In a method and a circuit arrangement for operating an ultrasound oscillation system, wherein an excitation voltage is applied to an ultrasound oscillation system comprising an ultrasound oscillator and components for forming an oscillation circuit for generating an excitation current and wherein the frequency of the excitation voltage is adjustable for operating the ultrasound oscillation system at a predetermined operating point, upon switching on the ultrasound oscillation system, the frequency, beginning with a startup frequency, is changed until the operating point is reached, and, upon switching off the ultrasound oscillation system, the frequency of the excitation circuit is recorded in a storage device and the recorded value is used for determining the startup frequency when the ultrasound oscillation system is again switched on.
    Type: Grant
    Filed: June 29, 2006
    Date of Patent: October 21, 2008
    Assignee: Martin Walter Ultraschalltechnik AG
    Inventor: Dieter Schief
  • Patent number: 7431728
    Abstract: Ultrasound medical devices, systems and methods are described. According to an example method, an absolute value of a first input to a voltage controlled oscillator (VCO) is determined. The VCO is in electrical communication with an acoustic assembly of an ultrasound medical device. If the absolute value of the first input to the VCO is in a first range, a second input to the VCO is maintained. If the absolute value of the first input to the VCO is in a second range, the second input to the VCO is adjusted by a first voltage. If the absolute value of the first input to the VCO is in a third range, the second input to the VCO is adjusted by a second voltage.
    Type: Grant
    Filed: September 5, 2006
    Date of Patent: October 7, 2008
    Assignee: OmniSonics Medical Technologies, Inc.
    Inventors: Jason Gerry, Charles Vadala, Jr., Bernard Alford
  • Publication number: 20080224783
    Abstract: In an ultrasonic operation apparatus according to the present invention, in order to detect the initial resonance frequency (Fro) promptly once a foot switch is pressed, under the control of a sweeping speed control circuit, the D/A converter D/A converts 8-bits of signals (phase difference amount signal ??) representing the amount of the phase difference detected by the phase comparator, and the output of the D/A converter is output to a VCO so as to become a clock for a sweep circuit. When a phase difference amount between ?i and ?v is large and a drive frequency setting signal (Es) is far from Fro, the sweeping speed for Fro detection is increased. When a phase difference amount between ?i and ?v is small and Ps is close to Fro, the sweeping speed for Fro detection is decreased.
    Type: Application
    Filed: May 22, 2008
    Publication date: September 18, 2008
    Applicant: OLYMPUS CORPORATION
    Inventor: Kazue Tanaka
  • Patent number: 7409029
    Abstract: There is provided a flexible transmission device capable of automatically setting an optimal point for a signal decision making with high accuracy, so that highly reliable high-quality signal regeneration control is achieved. A clock timing extraction circuit dynamically sets a frequency-dividing ratio based on the transmission rate of an input signal to perform a phase synchronization control so that there is a fixed phase difference between the input signal and an oscillation output, whereby clock timing based on the transmission rate can be extracted. A regeneration control circuit sequentially sweeps a voltage threshold level and the phase of the extracted cock with respect to the input signal and determines whether the levels of adjacent monitor points match, whereby a decision point within the valid zone of the eye pattern can be automatically measured and used as the optimal point for regeneration control.
    Type: Grant
    Filed: November 29, 2001
    Date of Patent: August 5, 2008
    Assignee: Fujitsu Limited
    Inventors: Wataru Kawasaki, Sunao Ito
  • Patent number: 7365608
    Abstract: A single chip digital frequency synthesiser (1) for synthesising a frequency swept synthesised output signal of a selectable frequency sweep comprises a direct digital synthesiser (5) which produces the frequency swept synthesised output signal on an output terminal (7) in response to values of a frequency control digital word applied to a frequency control input (8) thereof by an on-chip data processing circuit (25). An on-chip programmable data storing circuit (12) is programmable to store data indicative of a selected mode in which the digital frequency synthesiser (1) is to operate, and to store data indicative of selectable frequency and the time domains of the frequency swept synthesised output signal to be produced.
    Type: Grant
    Filed: December 8, 2005
    Date of Patent: April 29, 2008
    Assignee: Analog Devices, Inc.
    Inventor: Hans Juergen Tucholski
  • Patent number: 7362826
    Abstract: A receiver circuit includes an oscillator circuit configured to generate a calibration tone and a phase locked loop (PLL) reference signal. An output frequency of the VCO may be divided by respective amounts to derive a desired calibration tone frequency and a desired PLL reference signal frequency. In addition to the oscillator circuit, the receiver circuit may further include a phase locked circuit configured to generate a PLL output signal that is phase locked in relation to the PLL reference signal. During a calibration mode, a quadrature generator may be used to generate quadrature mixer local oscillator signals dependent upon the PLL output signal, and an in-phase/quadrature mixer may be used to mix the calibration tone with the quadrature mixer LO signals.
    Type: Grant
    Filed: September 29, 2003
    Date of Patent: April 22, 2008
    Assignee: Silicon Laboratories, Inc.
    Inventor: Scott D. Willingham
  • Patent number: 7355484
    Abstract: An oscillator and a radar apparatus that includes a resonator electro-magnetically connected to a micro strip line and a rotor connected to the resonator by capacitance. The bottom surface of the rotor has a changing height in the circumferential direction of the rotor. As the rotor is rotated, an actual oscillation frequency is recognized from the rotating angle of the rotor when an output of a detector has a peak. A modulation voltage supplied to a VCO is corrected in accordance with the result.
    Type: Grant
    Filed: October 19, 2004
    Date of Patent: April 8, 2008
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Takatoshi Kato, Toru Ishii
  • Patent number: 7155190
    Abstract: A high frequency sweep generator uses a DDS-PLL method for frequency sweep over wide frequency spans. A digital sweep generator produces a linear ramp signal using DDS techniques that is applied to a coarse tuning port of a high frequency tunable oscillator, such as a YIG tunable oscillator (YTO). A PLL has as inputs an accurate linear swept frequency sinusoid from a DDS and a linear swept frequency output signal from the YTO to produce an error correction signal that is applied to a fine tuning port of the high frequency tunable oscillator. The error correction signal compensates for any non-linearities introduced into the linear swept frequency output signal by the high frequency tunable oscillator.
    Type: Grant
    Filed: February 19, 2004
    Date of Patent: December 26, 2006
    Assignee: Tektronix, Inc.
    Inventor: Lowell A. Rathbun, Jr.
  • Patent number: 6952569
    Abstract: A transmitter for a wireless handset having a modified translation loop architecture. The transmitter includes a VCO that generates a modulated transmit signal having a frequency fTx, and a modulated signal source that generates a modulated LO signal with a frequency fLO. A mixer mixes the transmit signal with the LO signal to produce an IF signal having a frequency fIF. A first divider divides the LO signal frequency fLO by an integer M to generate a first comparison signal having a frequency fCF. A second divider divides the IF signal frequency fIF, after it is multiplied by an integer K, by an integer N to generate a second comparison signal having a frequency fCF. The transmit and LO signal frequencies have the relationship f Tx = f LO ? KM ± N M . A phase detector coupled to the first and second comparison signals compares the phases of the signals and outputs a control voltage to the VCO proportional to any phase differences between the signals.
    Type: Grant
    Filed: February 24, 2003
    Date of Patent: October 4, 2005
    Assignee: Skyworks Solutions, Inc.
    Inventors: Morten Damgaard, Rahul Magoon
  • Patent number: 6946916
    Abstract: The present invention relates to an arrangement for phase locking of a Voltage Controlled Oscillator (VCO) to a selected frequency harmonic among a number of predetermined or available frequencies (harmonics), comprising a reference generator for generating a reference frequency, a phase lock loop (1; 101; 10; 4, 5, 6, 9) for producing an output signal in response to the input reference frequency, said phase lock loop comprising (enclosing) a phase defector (1), a loop filter (10), said VCO (5), adding means (4) and a power splitter (6). The arrangement also includes a sweep generator (9). It further comprises or is associated with storing means 82) for scoring information about, for each selectable or available frequency harmonic, a first (coarse) control voltage providing a VCO frequency output which is lower/higher than, and differs from the selected frequency (harmonic) by a given value (?f1).
    Type: Grant
    Filed: September 23, 2004
    Date of Patent: September 20, 2005
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Lennart Hyden, Björn Lofter, Máns Cederlof
  • Patent number: 6891904
    Abstract: An analysis operation section uses a digital signal converted by an A/D converter, and performs frequency analysis for a modulation signal and modulation analysis for the modulation signal selected by a signal selection circuit in order to modulate/analyze a digital signal level of the modulation signal as an analysis object outputted from a level converter. A controller instructs the analysis operation section to execute an analysis instruction inputted via an operation input section, sends a selection instruction to the signal selection circuit in accordance with a modulation type of the inputted modulation signal, and sets a bandwidth of an RBW filter in accordance with the modulation type when the modulation signal having a band limited by the RBW filter is selected as the modulation signal inputted to the A/D converter, and the modulation analysis instruction is inputted.
    Type: Grant
    Filed: November 8, 2000
    Date of Patent: May 10, 2005
    Assignee: Anritsu Corporation
    Inventor: Tomohisa Okada
  • Patent number: 6526265
    Abstract: A transmitter for a wireless handset having a modified translation loop architecture. The transmitter includes a VCO that generates a modulated transmit signal having a frequency fTx, and a modulated signal source that generates a modulated LO signal with a frequency fLO. A mixer mixes the transmit signal with the LO signal to produce an IF signal having a frequency fIF. A first divider divides the LO signal frequency fLO by an integer M to generate a first comparison signal having a frequency fCF. A second divider divides the IF signal frequency fIF, after it is multiplied by an integer K, by an integer N to generate a second comparison signal having a frequency fCF.
    Type: Grant
    Filed: September 14, 1999
    Date of Patent: February 25, 2003
    Assignee: Skyworks Solutions, Inc.
    Inventors: Morten Damgaard, Rahul Magoon
  • Patent number: 6504354
    Abstract: A sweep controller supplies a current to a YTO(YIG-Yttrium-Iron-Garnet Tuned Oscillator) from a current drive circuit in such a manner that frequencies corresponding to a first range in an oscillation frequency of the YTO designated as a desired frequency range for analysis with one sweep, and a second range designated as a frequency range higher than the first range for the analysis with the next one sweep are oscillated by the YTO. Moreover, the sweep controller outputs an instruction for increasing the current flowing through the YTO from the current drive circuit over a part of a period between an end of the first range and a start of the second range in order to shorten the period between the end of the first range and the start of the second range when it is detected that a difference between an end frequency of the first range and a start frequency of the second range is larger than a predetermined frequency difference.
    Type: Grant
    Filed: June 18, 2001
    Date of Patent: January 7, 2003
    Assignee: Anritsu Corporation
    Inventor: Yuichi Waida
  • Patent number: 6469584
    Abstract: A system and method have been provided for a phase-locked loop (PLL) circuit to use a selectable VCO frequency range during the acquisition of a signal, with a larger VCO frequency sweep window once the signal is being tracked. The circuit uses a frequency detector during acquisition, and the VCO is limited to operation is a plurality of discrete frequency bands. Each frequency band is sequentially searched using the low VCO gain. Upon acquisition, the frequency band is locked in, a phase detector is utilized, and the VCO sweep window is increased for tracking purposes.
    Type: Grant
    Filed: November 8, 2000
    Date of Patent: October 22, 2002
    Assignee: Applied Micro Circuits Corporation
    Inventors: Mehmet M. Eker, Joseph J. Balardeta
  • Patent number: 6460001
    Abstract: An input clock signal is transformed into a complex analytic signal zc(t) by an analytic signal transforming means 13 and an instantaneous phase of its real part xc(t) is estimated using the analytic signal zc(t). A linear phase is removed from the instantaneous phase to obtain a phase noise waveform &Dgr;&phgr;(t). A peak value &Dgr;&phgr;max of absolute values of the &Dgr;&phgr;(t) is obtained, and 4&Dgr;&phgr;max is defined as the worst value of period jitter of the input signal. The &Dgr;&phgr;(t) is sampled at a timing close to a zero-crossing point of the xc(t) to extract the sample value. A differential between adjacent samples is obtained in the sequential order to calculate a root-mean-square value of the differentials (period jitters). An exp(−(2&Dgr;&phgr;max)2/(2&sgr;j2)) is calculated from the mean-square value &sgr;j and 2&Dgr;&phgr;max, and the calculated value is defined as a probability that a period jitter exceeds 2&Dgr;&phgr;max.
    Type: Grant
    Filed: March 29, 2000
    Date of Patent: October 1, 2002
    Assignee: Advantest Corporation
    Inventors: Takahiro Yamaguchi, Masahiro Ishida, Mani Soma
  • Patent number: 6424229
    Abstract: Voltage controlled oscillator circuits are provided including a voltage controlled oscillator (VCO) having an input and an output responsive to the input. A tuning circuit coupled to the VCO sets a relationship between the input and the output of the VCO. An aided acquisition circuit is coupled to the input of the VCO. A control circuit selects a state of the tuning circuit to set the relationship between the input and the output of the VCO. The control circuit also controls operation of the aided acquisition circuit responsive to changes in the state of the tuning circuit. Methods for operating voltage controlled oscillator circuits are also provided. In addition, phase lock loop circuits and mobile terminals including the voltage controlled oscillator circuits are provided.
    Type: Grant
    Filed: June 4, 2001
    Date of Patent: July 23, 2002
    Assignee: Ericsson Inc.
    Inventors: Scott R. Justice, Erik L. Bengtsson
  • Patent number: 6404289
    Abstract: The present invention provides a synthesizer having an efficient lock detect signal generator, an extended range VCO that can operate within any one of a plurality of adjacent characteristic curves defined by a plurality of adjacent regions, and a divide circuit implemented using only a single counter along with a decoder. This allows for a method of operating the synthesizer, methods of establishing or reestablishing a lock condition using the extended range VCO, and a method of designing a plurality of divide circuits which each use the same single counter and each use a different decoder.
    Type: Grant
    Filed: December 22, 2000
    Date of Patent: June 11, 2002
    Assignee: Atheros Communications, Inc.
    Inventors: David K. Su, Chik Patrick Yue, David J. Weber, Masound Zargari
  • Patent number: 6373235
    Abstract: In one embodiment, a high-resolution measurement apparatus and method determine the position and motion of an object such as a human hand relative to a sensor array. Capacitance transferred to the array by the object within a sensor field produces minute phase changes in a fixed-frequency reference signal applied to the several elements of the array. The phase changes are measured by first heterodyning the phase-shifted reference signal with a second reference signal to obtain a low frequency intermediate signal, and then employing a phaselocked loop to multiply the phase information in the intermediate signal by orders of magnitude, thereby permitting the use of conventional methods to measure the resulting greatly magnified phase changes. Other embodiments provide direct digital measurement of unknown electrical properties, such as capacitance, inductance, and resistance.
    Type: Grant
    Filed: May 3, 2000
    Date of Patent: April 16, 2002
    Inventor: Clifford A. Barker
  • Patent number: 6334060
    Abstract: A multi-channel system is provided for both wide-band and narrow band low frequency transmission/reception of digital telemetry. The multi-channel system uses coherent detection having a high selectivity, and a quadrature detector having a high sensitivity. A filter is provided to average out noise. The multi-channel system oscillator is software controlled for scanning/multiplexing. The multi-channel system is used for data transmission over inductive, infrared, sonic and cable links.
    Type: Grant
    Filed: October 28, 1998
    Date of Patent: December 25, 2001
    Assignee: Acumen, Inc.
    Inventors: Ka Yiu Sham, Philip Lim-Kong Wong
  • Patent number: 6252464
    Abstract: An inexpensive numerically-controlled fast frequency-hopping microwave synthesizer. A voltage-controlled oscillator (VCO) output phase remains locked to an internal direct digital synthesizer (DDS) reference signal over the entire output frequency band, which is an order of magnitude larger than the internal sampling clock frequency. A “Nyquist-boundary hopping” scheme compares signals from an alias band of the DDS with signals from an alias band of the sampled VCO output to derive an output phase error signal, which is forced to zero in a manner that locks the VCO output phase to the DDS output phase over a frequency hop-distance greater than the DDS bandwidth. Accordingly, in a single second, the synthesizer can hop phase-continuously in a single clock cycle to each of hundreds of thousands of different microwave output frequencies with relatively low clock rates (up to 100 MHz) commensurate with silicon application-specific integrated circuits (ASICs).
    Type: Grant
    Filed: October 6, 1999
    Date of Patent: June 26, 2001
    Assignee: Cubic Defense Systems, Inc.
    Inventors: Wayne Edward Richards, Jeffrey Morris Keefer
  • Patent number: 6236276
    Abstract: In a method for seeking and setting a resonant frequency for a load impedance and a tuner for carrying out the method, a first frequency sweep is performed over a predetermined frequency interval in order to identify the resonant frequency within the predetermined frequency interval. To maintain the correct resonant frequency, regardless of signal drift and other interference, repeated sweeps are automatically performed within the predetermined frequency interval to identify the resonant frequency repeatedly. Alternating semi-sweeps can be performed to reduce the sweep duration.
    Type: Grant
    Filed: December 21, 1999
    Date of Patent: May 22, 2001
    Assignee: Siemens-Elema AB
    Inventor: Göran Cewers
  • Patent number: 6201447
    Abstract: Improved phase synchronization circuits shorten the length of the synchronization pull-in time. The phase synchronization circuit according to the first invention changes the free-running frequency of the voltage control oscillation means starting from one limit frequency of the sweep range when detecting a state of non-synchronization and performing a synchronization pull-in operation. The phase synchronization circuit according to the second invention changes the free-running frequency of the voltage control oscillation means starting to one limit frequency of the sweep range faster than a prescribed speed and then changes the free-running frequency of the voltage control oscillation means to the other limit frequency of the sweep range at the prescribed speed when detecting a state of non-synchronization and performing a synchronization pull-in operation.
    Type: Grant
    Filed: December 28, 1998
    Date of Patent: March 13, 2001
    Assignee: Oki Electric Industry Co., Ltd.
    Inventor: Hideo Tsutsui
  • Patent number: 6150892
    Abstract: A method and device for frequency synthesizing, in which the digital frequency synthesizer includes a clock pair having two similar ring-oscillators to separately generate a search frequency and an output frequency, a frequency tracking unit, and a clock controlling unit. The frequency-search method includes two stages: one stage is the coarse search stage based on the "Prune-and-Search", and other stage is the fine search stage based on the "fixed-step" algorithm. In order to determine which search scheme is used to search the target frequency and to determine the lock status, two cost functions for search and lock-in are derived. These two cost functions define the search threshold and the lock threshold, and these thresholds define the cost window and the lock window. If the frequency error is higher than both the search and lock thresholds, a coarse search is activated to estimate the correct frequency.
    Type: Grant
    Filed: October 30, 1998
    Date of Patent: November 21, 2000
    Assignee: TFL Lan Inc.
    Inventors: Chen-Yi Lee, Terng-Yin Hsu, Bai-Jue Shieh, Chung Cheng Wang
  • Patent number: 6147560
    Abstract: The present invention relates to methods and devices for such control and supervision of an oscillator signal from a controllable oscillator that is done mainly to control the frequency variation of the oscillator signal. According to the invention, the controllable oscillator is controlled by a controlling voltage, which in turn is modified by a correction signal, generated in a control loop. A time discrete representation of a secondary phase is generated in the control loop, the secondary phase corresponding to a frequency being the difference between the frequency of the oscillator signal and a constant frequency. A time discrete approximation signal is generated in dependence of the time discrete representation of the secondary phase. A time discrete error signal is generated in dependence of the time discrete approximation signal, the time discrete error signal indicating the difference between the actual frequency slope of the oscillator signal and a desired frequency slope.
    Type: Grant
    Filed: January 26, 1998
    Date of Patent: November 14, 2000
    Assignee: Telefonaktiebolget LM Ericsson
    Inventors: Lars I. Erhage, Osten E. Erikmats, Svenolov Rizell, H.ang.kan L. Karlsson
  • Patent number: 6137846
    Abstract: An AFC circuit for a frequency scanning FSK receiver is so constructed that through put of data which can be transmitted is improved by shortening a header of a packet signal owing to the fact that frequency errors remaining when an object signal is caught by the frequency scanning and the frequency scanning is stopped are eliminated in a short period of time.In the frequency scanning FSK receiver having an AFC function, the scanning is stopped, when either one of upper and lower side band waves of a bit synchronizing signal of a desired signal is caught by the frequency scanning by means of a VCO, to which a scanning voltage from a scanning signal generator is applied. An operating circuit calculates a set voltage applied to the VCO at the AFC convergence to form it on the basis of a control voltage (scanning voltage) applied to the VCO at that time and a control sensitivity thereof as well as a detection voltage and a detection sensitivity of a frequency error detector at that time.
    Type: Grant
    Filed: March 17, 1998
    Date of Patent: October 24, 2000
    Assignee: General Research of Electronics, Inc.
    Inventor: Kazuo Kawai
  • Patent number: 6133795
    Abstract: A stabilised voltage controlled oscillator circuit comprises a closed loop circuit containing a voltage controlled oscillator (34), a local oscillator (40) and a harmonic mixer (38) that mixes a stabilised local oscillator (LO) frequency signal and a radio frequency (RF) signal from the voltage controlled oscillator (34) to obtain an intermediate frequency (IF) signal. An IF amplifier (42) is connected to a linear frequency discriminator (44) that provides an output signal to a summing amplifier (46), which is connected to the voltage controlled oscillator (34). The closed loop circuit uses the linear frequency discriminator (44) to provide a feedback signal that stabilises the voltage controlled oscillator (34).
    Type: Grant
    Filed: July 10, 1998
    Date of Patent: October 17, 2000
    Inventor: Roscoe Charles Williams
  • Patent number: 6114987
    Abstract: A system and method for generating a linear frequency sweep while also improving the phase noise characteristics of a microwave or millimeter wave signal source. The invention uses two phase lock loops. The first phase lock loop uses a linear frequency source to linearize a relatively low frequency VCO (typically around 100 MHz). The first phase lock loop has a bandwidth that is only wide enough to pass the radar modulation waveform with minimal distortion. The first phase lock loop includes a phase detector, narrow band loop filter, low noise HF VCO and a divide by M counter. The second phase lock loop is used to lock a millimeter wave VCO to the lower frequency of the low frequency VCO in the first loop. The low phase noise characteristics of this low frequency VCO are effectively impressed upon a microwave or millimeter wave, low noise high frequency VCO.
    Type: Grant
    Filed: May 29, 1999
    Date of Patent: September 5, 2000
    Assignee: Sensor Technologies & Systems, Inc.
    Inventor: John E. Bjornholt
  • Patent number: 6064270
    Abstract: A system for compensating for reference frequency drift in a communications system. The inventive system includes a frequency source for providing a reference frequency. An error determination circuit determines if the reference frequency is within a predetermined range of a desired reference frequency and provides an error signal in response thereto. A frequency correction circuit steps the reference frequency up and/or down by a predetermined amount in response to the error signal until the reference frequency is within the predetermined range of the desired reference frequency. In a specific embodiment, the predetermined amount is twice the short-term capture range of the reference frequency which corresponds to approximately four parts per million. The predetermined range is the short-term capture range or two parts per million. The predetermined range is dependent upon the reference frequency band in which the receiver can successfully receive and decode the receive signal.
    Type: Grant
    Filed: April 21, 1998
    Date of Patent: May 16, 2000
    Assignee: Uniden San Diego Research & Development Center
    Inventor: Robert Keith Douglas
  • Patent number: 6031883
    Abstract: A method utilizing intentionally generated in-band frequency harmonics to compensate for frequency error and frequency drift in a voltage controlled oscillator of a receiver, thereby eliminating the frequency synthesizer and RF divider required in conventional designs. The method includes modulating the intentionally generated frequency in a predetermined manner so that a receiver can identify the intentionally generated frequency and includes the use of plural frequency harmonics for use in a curve fitting technique to correct frequency error in the voltage controlled oscillator.
    Type: Grant
    Filed: September 16, 1997
    Date of Patent: February 29, 2000
    Assignee: Sanconix, Inc.
    Inventors: H. Britton Sanderford, Jr., Robert J. Davis, Robert E. Rouquette
  • Patent number: 6031427
    Abstract: A phase locked loop ("PLL") 28 containing apparatus for automatically causing the PLL to achieve phase lock when first energized or after having lost phase lock. In addition to a phase detector 4, loop filter 13, voltage controlled oscillator ("VCO") 14 and feedback from the VCO to the phase detector 16, the PLL has a sweep circuit 30. The sweep circuit cooperates with the loop filter when the PLL is not in phase lock to automatically generate a control voltage for the VCO which control voltage increases linearly with time until the PLL achieves phase lock or until the control voltage has reached the largest voltage in the dynamic input range of the VCO. In the event that phase lock is not achieved during the period of the increasing voltage, the control voltage decreases linearly with time to drive the PLL into phase lock.
    Type: Grant
    Filed: February 10, 1998
    Date of Patent: February 29, 2000
    Assignee: Texas Instruments Incorporated
    Inventor: Michael F. Black
  • Patent number: 6016069
    Abstract: A phase locked loop includes a controlled oscillator that is responsive to a control signal to generate an output signal, the frequency of which is a function of the control signal. A phase detector is responsive to a reference frequency input signal and to the output signal, to produce an error signal. A loop filter filters the error signal, to thereby produce the control signal. An acquisition sweep circuit is responsive to an activation signal, to sweep the control signal and thereby aid to acquire lock in the phase locked loop. Simultaneous increase in the amplitude of the reference frequency input signal is provided during sweep of the control signal. The increase in amplitude may be provided by a variable attenuation circuit that is coupled between a phase locked loop input signal and the reference frequency input signal, and that is also responsive to the activation signal.
    Type: Grant
    Filed: February 10, 1998
    Date of Patent: January 18, 2000
    Assignee: Ericsson Inc.
    Inventor: Bogdan Sadowski
  • Patent number: 6014063
    Abstract: A system of spreading the energy of higher harmonic frequencies in digital circuits to lower the interference to bandpass receivers is disclosed. A set of passive, impedance-regulated circuits, preferably housed in a standard enclosure, comprises a power restoring unit, a modulating signal generator, an internal oscillator and an impedance spreading unit. The circuits are equivalent to passive resonators such as crystal resonators used in standard oscillators. Any existing standard oscillator that uses common crystal resonators can be transformed into a spectrum-spread oscillator by replacing the crystal resonator with the disclosed circuit, whereby a tightly controlled small frequency spreading occurs in the fundamental clock frequency. Further an active oscillator is disclosed wherein a spreading circuit spreads the frequency of the clock signal originally generated by the oscillator based on a sequence of processing the original clock signal.
    Type: Grant
    Filed: August 27, 1997
    Date of Patent: January 11, 2000
    Assignee: Quiet Solutions, Inc.
    Inventors: Dongtai Liu, Mohammed A. Safai