Pulse Or Interrupted Continuous Wave Modulator Patents (Class 332/106)
  • Patent number: 8054908
    Abstract: A transmitter circuit, which transmits data by using an impulse, has a variable delay circuit and a logic circuit. The variable delay circuit takes a clock as an input, and delays the clock in accordance with the data. The logic circuit takes the clock and an output of the variable delay circuit as inputs, and outputs an impulse by performing a logic operation between the clock and the output of the variable delay circuit.
    Type: Grant
    Filed: December 4, 2007
    Date of Patent: November 8, 2011
    Assignee: Fujitsu Limited
    Inventors: Yasuhiro Nakasha, Yoichi Kawano
  • Patent number: 8031809
    Abstract: A template pulse generating circuit that generates a template pulse used for detection of a received pulse in pulse communication includes an output mode switching circuit for switching an output mode in accordance with a supplied control signal between a continuous output mode that continuously outputs the template pulses and an intermittent output mode that intermittently outputs the template pulses so that the template pulse is generated in either one of the continuous output mode and the intermittent output mode.
    Type: Grant
    Filed: February 27, 2008
    Date of Patent: October 4, 2011
    Assignee: Seiko Epson Corporation
    Inventor: Izumi Iida
  • Publication number: 20110221540
    Abstract: A pulse density modulation, PDM, driver, outputs a PDM stream and can be switched to a control token. The switch takes place when the first integral of the PDM stream has a magnitude less than or equal to a first predetermined value and the second integral of the PDM stream has a magnitude less than or equal to a second predetermined value.
    Type: Application
    Filed: March 9, 2011
    Publication date: September 15, 2011
    Applicant: NXP B.V.
    Inventor: Lûtsen Ludgerus Albertus Hendrikus DOOPER
  • Patent number: 7965150
    Abstract: It is an object of the present invention to shorten a time required until phases of output signals being output from two output terminals are inverted respectively from a start time of an oscillation in a differential oscillation apparatus.
    Type: Grant
    Filed: May 23, 2007
    Date of Patent: June 21, 2011
    Assignee: Panasonic Corporation
    Inventors: Shigeru Kobayashi, Suguru Fujita
  • Patent number: 7953182
    Abstract: Transmitters, receivers and associated methods are disclosed for providing phase and amplitude modulation in a carrier-less communication system (e.g., an ultra-wide band communication system). An approximate quadrature signal is provided by delaying the in-phase signal by an amount determined by various criteria, such as the bandwidths of the component signals, minimizing the mean square error between an approximate quadrature signal and the true quadrature signal, and minimizing the auto-correlation function of the in-phase signal.
    Type: Grant
    Filed: April 14, 2009
    Date of Patent: May 31, 2011
    Assignee: Ultrabit Communications LLC
    Inventor: Stephan V. Schell
  • Patent number: 7940861
    Abstract: The present invention relates to a method for reducing cycle slips in a carrier recovery loop for a phase detector, the method comprising the steps of receiving an input signal consisting of samples, each received sample having an in-phase (I) and quadrature-phase (Q) component, providing the input signal to a phase error estimator adapted to determine a phase error estimate, providing the phase error estimate to a loop filter, and forming an output signal from the carrier recovery loop by subtracting an output from the loop filter from the input signal, wherein the phase error estimate is determined based on a combination of the amplitude and phase of the samples and a probability measure for a specifically transmitted symbol, thereby improving phase tracking performance of the carrier recovery loop.
    Type: Grant
    Filed: December 7, 2007
    Date of Patent: May 10, 2011
    Assignee: Advantech Advanced Microwave Technologies, Inc.
    Inventor: Håkan Grenabo
  • Patent number: 7911283
    Abstract: A low noise oscillator includes a resonator 102 that is excited with a pulsed signal (i.e., an impulse of energy) to replace energy lost to parasitic resistive losses once every Nth period (where N=1, 2, 3 . . . ). The resonating signal is monitored by a level detector and when the signal falls below a predetermined threshold, the pulse generator outputs a pulse or adjusts pulse width, pulse amplitude (or both) of a pulsed signal to create the necessary impulse for application to the resonator to recoup losses resulting from resonator operation. A phase shifting circuit may be provided to ensure the pulses are time aligned with the resonating signal to reduce noise.
    Type: Grant
    Filed: December 31, 2007
    Date of Patent: March 22, 2011
    Assignee: Nortel Networks Limited
    Inventors: Adrian J. Bergsma, Charles Nicholls
  • Patent number: 7907664
    Abstract: Systems and method to compress digital video based on human factors expressed as a desirability score are provided. A particular method includes passing a digital input signal through a pulse-width modulator and passing an output of the pulse-width modulator through a power switching device. An output of the power switching device has a plurality of pulses. The method includes receiving the output of the power switching device at a first input of a comparator and receiving a reference voltage at a second input of the comparator. The method includes determining a net signal based on an output of the comparator and determining a timing error signal based on the net signal and the digital input signal. The method also includes adjusting the digital input signal to compensate for harmonic distortion based at least in part on the timing error signal.
    Type: Grant
    Filed: December 7, 2009
    Date of Patent: March 15, 2011
    Assignee: Sigmatel, Inc.
    Inventors: Zukui Song, Michael Determan
  • Patent number: 7881402
    Abstract: A method for correcting gain imbalance error, phase imbalance error and DC offset errors in a transmitter having an OFDM-based I/Q modulator is disclosed. The method employs a compensator prior to the I/Q-modulator to compensate for the gain and phase imbalance and DC offset. The compensator is efficiently updated with the estimated values of gain and phase imbalance and DC offsets obtained by performing the DFT operation in the digital baseband domain while sending a pair of orthogonal test tones to the modulator's inputs from a digital baseband chip, then down converting the RF modulated signal through a nonlinear device and a bandpass filter to a baseband signal, and finally sampling it using an A/D. The delay mismatch, which is mainly generated by lowpass filters between the I and Q branches, is also minimized in this method.
    Type: Grant
    Filed: April 25, 2007
    Date of Patent: February 1, 2011
    Assignee: VIA Technologies, Inc.
    Inventors: Weig Gao, Didmin Shih
  • Patent number: 7830213
    Abstract: A signal generator, a signal generation method, and a communication system using the same are provided. The signal generator includes a plurality of nonlinear elements which are connected in a ring; and a signal distributor which is arranged in the ring to form a closed loop, feeds part of a signal to one of the plurality of the nonlinear elements, and outputs signal generated by one of the plurality of nonlinear elements. The method includes arranging a plurality of nonlinear elements connected in a ring; inputting a signal to one of the nonlinear elements; amplifying the signal; receiving the amplified signal and generating a harmonic component of a frequency; clipping the signal; and feeding part of the signal back to one of the nonlinear elements and outputting a remainder of the signal. The system includes a chaotic signal generator; a signal distributor; a modulator; and a transmission circuit.
    Type: Grant
    Filed: September 20, 2006
    Date of Patent: November 9, 2010
    Assignees: Samsung Electronics Co., Ltd., Institute of Radio Engineering and Electronics of RAS
    Inventors: Sang-Min Han, Seong-soo Lee, Young-hwan Kim, Alexander S. Dmitriev
  • Patent number: 7830218
    Abstract: A communications device includes a supply terminal which is able to be connected to a two-position-controlled power supply; a pulse width recording device, which is coupled to the supply terminal and which records a pulse width of current pulses that flow through the supply terminal, and a signal processing device which assigns a first logical level to a first recorded pulse width and a second logical level to a second recorded pulse width.
    Type: Grant
    Filed: August 17, 2007
    Date of Patent: November 9, 2010
    Assignee: Robert Bosch GmbH
    Inventors: Karl-Heinz Schauer, Bernhard Mader, Ingo Pietsch, Timo Schmidt, Thomas Holst
  • Publication number: 20100271148
    Abstract: A signal modulator that can control transmission power if level adjustment of a continuous signal from an oscillator is executed is provided. A pulse generator of one example of a signal modulator includes an oscillator, a control signal generator, a multiplier, a filter, and a control section. The oscillator and the multiplier are active circuits formed of active elements. A continuous signal is output from the oscillator and is input to the multiplier and the multiplier intermittently operates by a control signal output from the control signal generator, whereby a pulse signal is generated and the power level is easily adjusted by a signal from the control section.
    Type: Application
    Filed: December 25, 2008
    Publication date: October 28, 2010
    Inventors: Shigeru Kobayashi, Michiaki Matsuo, Junji Sato
  • Patent number: 7809077
    Abstract: The invention relates to search and rescue service and can be used for debris active sounding. Said invention makes it possible to improve interference protection related to a temperature, the operator hands motion and trembling effecting the locator operation. The inventive method consists in forming an ultrabandwidth signal (UBW) according to a reference signal, in emitting the thus formed UBW signal to space, in receiving the UBW signal, in processing the UBW signal by correlating it with a reference UBW signal, wherein while processing the received UBW signal, the reference UBW signal is delayed for a time during which the initial position of a check point on a middle section between the maximum and minimum voltage of the correlated signal is set, in periodically monitoring the position of said check point and in modifying the space emission delay of the formed UBW signal when the check point position shifts from the initial position thereof, thereby resetting the check point position.
    Type: Grant
    Filed: September 26, 2005
    Date of Patent: October 5, 2010
    Assignees: Life Sensor Co., Ltd
    Inventors: Gairat Saidkhakimovich Ikramov, Aleksandr Vladimirovich Andriyanov, Sergei Vasilevich Kuramshev
  • Patent number: 7804917
    Abstract: An ultra-wideband clear channel assessment system uses a double-window energy technique for energy detection, which indicates a clear or busy channel.
    Type: Grant
    Filed: September 14, 2006
    Date of Patent: September 28, 2010
    Assignee: Sigma Designs, Inc.
    Inventors: Catherine A. French, Ruoyang Lu, Hung C. Nguyen
  • Patent number: 7764734
    Abstract: Digital pulse width modulation with variable period and error distribution that improves the tradeoff between resolution and clock speed in pulse width modulation circuits so that a higher resolution can be achieved with a lower clock speed. A preferred method includes, for a signal sample S and each value of P in a range Pmin to Pmax of pulse periods P, determining a pulse width V=round(P*S), where round(P*S) is the closest integer value of P*S, and the magnitude of the error |E|=|S?V/P|, for the value of V (Vopt) and P (Popt) associated with the lowest value of the magnitude of the error |E|, providing an output pulse of a pulse width Vopt during the pulse period Popt, and successively repeating a) and b). Other aspects of the invention may include error distribution, error squelching to prevent idle-tone, idle-noise artifacts, 2-samples-per-pulse and non-uniform sampling and pulsing. Other features are disclosed.
    Type: Grant
    Filed: October 31, 2006
    Date of Patent: July 27, 2010
    Assignee: Winbond Electronics Corporation
    Inventor: Samuel Chi Hong Yau
  • Patent number: 7729441
    Abstract: A method for generating a modulated carrier signal with reduced bit error rates based on a plurality of data symbols. A plurality of data symbols are received, and a digital input signal is generated based on the plurality of data symbols. The digital input signal are filtered to produce a digital output signal including a phase characteristic. The phase characteristic of the digital output signal remains close to the desired symbol phase for substantial portion of the symbol period. A carrier signal is modulated using the digital output signal to produce the modulated carrier signal.
    Type: Grant
    Filed: September 5, 2006
    Date of Patent: June 1, 2010
    Assignee: Pine Valley Investments, Inc.
    Inventor: Richard Duane Taylor
  • Patent number: 7710213
    Abstract: A circuit for voltage limitation is provided in a transponder with a resonant circuit, which comprises at least one inductor, a capacitor, a depletion layer component with an input, output, and a control input, a first resonant circuit terminal, which is connected to the input of the depletion layer element, and a second resonant circuit terminal, which is connected to the output of the depletion layer element, whereby there is a connection between the control input of the depletion layer component and the first resonant circuit terminal and the second resonant circuit terminal. A method for voltage limitation in a transponder is provided, whereby for voltage limitation in the transmitting and receiving resonant circuit, the control terminal of the depletion layer element is driven by the voltage of the first and second resonant circuit terminal.
    Type: Grant
    Filed: February 15, 2007
    Date of Patent: May 4, 2010
    Assignee: Atmel Automotive GmbH
    Inventors: Martin Berhorst, Alexander Kurz, Peter Schneider
  • Publication number: 20100074368
    Abstract: An asynchronous delta-sigma modulator is proposed that comprises an input port, a filter, an envelope path, a phase path, an amplifier, and a feedback path that conveys the amplifier output signal to the filter. The envelope path extracts an envelope from the signal provided by the filter and issues an envelope signal. The phase path processes or processes a phase from the signal provided by the filter and issues a phase signal. The amplifier comprises input ports for the envelope signal and the phase signal. The amplifier issues an amplifier output signal based on said envelope signal and said phase signal. The feedback path conveys the amplifier output signal to the filter. The feedback signal contains both amplitude information and phase information. A corresponding method and computer-program products usable for production and operation of the delta-sigma modulator are also disclosed.
    Type: Application
    Filed: September 24, 2009
    Publication date: March 25, 2010
    Inventors: Udo Karthaus, Horst Wagner
  • Patent number: 7684497
    Abstract: To reflect advantages of a constant phase modulation waveform, the invention provides a pulse amplitude modulated PAM waveform that is a superposition of Q0?2L?1 PAM component pulses in each symbol interval such that a significant portion of signal energy over each symbol interval is within the Q0 PAM component pulses. The present invention distributes most signal energy in one pulse and progressively lower energies in the remaining Q0?1 pulses of a symbol interval. The Laurent Decomposition is a special case of the present invention, but the present invention exhibits the energy distribution of the Laurent Decomposition in non-binary CPM waveforms and in multi-h (binary and non-binary) CPM waveforms, where h is a modulating index. All energy is distributed among only Q=2L?1 pulses in each symbol interval, though only Q0<Q pulses may in fact be transmitted in certain embodiments. A method, transmitter, receiver, and computer program are disclosed.
    Type: Grant
    Filed: June 30, 2005
    Date of Patent: March 23, 2010
    Assignee: Nokia Corporation
    Inventor: Marilynn P. Green
  • Patent number: 7667552
    Abstract: A system is described for generating a discrete noise-shaped variable switching frequency signal that may be used to define a digital pulse width modulation (“PWM”) period. The system may define a switching frequency waveform that may be used to generate a current switching frequency signal as a function of a system clock. The system may quantize the current switching frequency signal to generate a discrete switching frequency signal that is realizable with the system clock. The system may detect quantization noise and input the noise into the current switching frequency signal to eliminate or reduce discrete tones at the switching frequencies of a PWM signal spectrum.
    Type: Grant
    Filed: April 10, 2007
    Date of Patent: February 23, 2010
    Assignee: Freescale Semiconductor, Inc.
    Inventors: Pallab Midya, Xin Geng
  • Patent number: 7653148
    Abstract: A method and apparatus for modulating an input signal comprised of an ordered series of samples separated by a substantially constant period T comprising the steps of providing a carrier signal, the carrier signal comprised of a series of samples separated by a substantially constant period T, wherein one of the carrier samples corresponds to each of the input signal samples, selecting a plurality of N successive samples from the series of input signal samples, the series of samples having an input order, for each of the N selected samples in parallel, multiplying the selected sample by the corresponding carrier sample and recombining the N multiplied samples while maintaining the input order.
    Type: Grant
    Filed: January 28, 2009
    Date of Patent: January 26, 2010
    Assignee: Liquid Xstream Systems Inc.
    Inventors: Jean-Francis Kisovec, Benoit Dufresne
  • Patent number: 7606323
    Abstract: A transmitter circuit has two mixers that modulate a carrier wave according to an input signal, outputs a signal having information in a phase and an amplitude, detects a DC offset in each of the mixers, and adds a DC voltage that corrects the detected DC offset to the input signal of the mixers. The mixer is a double balanced mixer having two load resistors, and the transmitter circuit has a resistor that is connected between a node of two load resistors and a power supply, a limiter amplifier that amplifies a signal, and a control unit that changes first and second potentials using a signal that is outputted by the limiter amplifier. The first and second potentials become a potential of the DC voltage that corrects the DC offset.
    Type: Grant
    Filed: January 19, 2006
    Date of Patent: October 20, 2009
    Assignee: Renesas Technology Corp.
    Inventors: Satoshi Tanaka, Yukinori Akamine
  • Publication number: 20090168919
    Abstract: Provided is a pulse modulation circuit capable of generating a pulse modulation signal with a steep rise and a desired pulse width at a desired timing not depending on a transmission signal sequence. In this circuit, a control signal generation unit (110) generates a first control signal if transmission data (S11) is “1” and a second control signal if the transmission data (S11) is “0.” The control signal generation unit (110) controls an oscillator (1200) of an intermittently operating circuit (120) to be at an oscillation state for outputting a desired first oscillation signal while the first control signal is turned ON and controls the oscillator (1200) to be at an idling state for outputting a second oscillation signal having a lower amplitude than the first oscillation signal while the second control signal is turned ON.
    Type: Application
    Filed: June 19, 2007
    Publication date: July 2, 2009
    Inventors: Junji Sato, Shigeru Kobayashi, Suguru Fujita
  • Patent number: 7539257
    Abstract: A signal generator generates a coded or memory waveform having a trellis structure. A modulator is operative with the signal generator for adding at least one phase pulse to the trellis structure of the coded or memory waveform to create a substantially constant envelope modulated signal that increases the transmitted bits per symbol.
    Type: Grant
    Filed: November 5, 2004
    Date of Patent: May 26, 2009
    Assignee: Harris Corporation
    Inventors: James A. Norris, John W. Nieto
  • Patent number: 7539267
    Abstract: A method signals in an ultra-wide bandwidth network. A data symbol is generated. A set of reference pulses is transmitted for the data symbol. Each reference pulse is of a different type. One data pulse is also transmitted for each reference pulse. A type of each data pulse is identical to the type of the corresponding reference pulse.
    Type: Grant
    Filed: August 20, 2004
    Date of Patent: May 26, 2009
    Assignee: Mitsubishi Electric Research Laboratories, Inc.
    Inventors: Zafer Sahinoglu, Sinan Gezici
  • Patent number: 7532682
    Abstract: Transmitters, receivers and associated methods are disclosed for providing phase and amplitude modulation in a carrier-less communication system (e.g., an ultra-wide band communication system). An approximate quadrature signal is provided by delaying the in-phase signal by an amount determined by various criteria, such as the bandwidths of the component signals, minimizing the mean square error between an approximate quadrature signal and the true quadrature signal, and minimizing the auto-correlation function of the in-phase signal.
    Type: Grant
    Filed: November 27, 2002
    Date of Patent: May 12, 2009
    Inventor: Stephan V. Schell
  • Patent number: 7529300
    Abstract: Shaped Offset Quadrature Amplitude Modulation (QAM) can be implemented within a communication system. A train or sequence of orthogonal sinc pulses can be generated for each of the in-phase and quadrature signal paths. The sinc pulses in the quadrature signal path can have a predetermined time offset relative to the pulses in the in-phase signal path. An in-phase or quadrature antipodal data signal can be used to modulate the respective sinc pulse train. Each of the in-phase and quadrature pulses can be shaped using a time domain windowing function, such as a Kaiser-Bessel window, to adjust the spectral width and spectral sidelobe level of the signal. The beta parameter of the window can be adjusted to achieve the desired signal response. The timing of the sinc pulses may need to be adjusted following the window function in order to maintain orthogonality of the pulses.
    Type: Grant
    Filed: July 26, 2005
    Date of Patent: May 5, 2009
    Assignee: Cubic Corporation
    Inventor: Wayne Edward Richards
  • Patent number: 7512192
    Abstract: A phase conjugation vectoring (PCV) of signals propagating in telephone cables of twisted pairs provides crosstalk free transmission therethrough. The cable is considered a non-uniform physical media, and criteria for phase conjugation of electromagnetic fields are established. Method and system provide PCV for both asymmetric and symmetric transmission.
    Type: Grant
    Filed: February 10, 2004
    Date of Patent: March 31, 2009
    Inventor: Ilya M. Fishman
  • Patent number: 7512193
    Abstract: A circuit for pre-emphasis in data serialization. The circuit has a signal delayline to incrementally delay a serialized signal, producing a delayed serialized signal. The circuit has a one bit generator circuit, which determines the interval between receipt of one bit and a second bit. The one bit generator circuit has a strobe delayline to incrementally delay a strobe signal, producing a delayed strobe signal, a logical gate to compare the delayed strobe signal with a second strobe signal, and a logical component to determine how long the delayed strobe signal was delayed before it matched the second strobe signal. The circuit also has a comparison gate to detect transition points in the serialized signal by comparing the delayed serialized signal with the serialized signal. The circuit also has a current source to provide increased current for the serialized signal at the detected transition points.
    Type: Grant
    Filed: May 2, 2005
    Date of Patent: March 31, 2009
    Assignee: National Semiconductor Corporation
    Inventors: Peter Shing, Min Du, Xin Liu, Qingping Zheng
  • Patent number: 7498978
    Abstract: A device for generating high powered Radio Frequency (RF) or microwave signals comprising a fast rise-time video pulse generator, a modulator to modify the generated UWB pulses by gyromagnetic action to transfer a portion of the UWB pulse energy from lower frequencies to frequencies in the RF or microwave range thereby producing a resultant RF or microwave waveform that can be radiated.
    Type: Grant
    Filed: October 30, 2003
    Date of Patent: March 3, 2009
    Assignee: BAE Systems plc
    Inventors: Nigel Seddon, John E Dolan
  • Patent number: 7496151
    Abstract: Data from the orthogonal data generator is quantized by the vector data converter to become, for example, a binary value of 0 and a real number in magnitude. The output of the vector converter is modulated by the modulator, and is inputted to the amplifier. In the amplifier, the envelope of the signal to be inputted is quantized. That is, the signal of a constant envelope becomes a signal which is turned ON and OFF, so that a highly efficient nonlinear amplifier can be used. The filter removes the quantization noise generated in the vector data converter and then the signal of a low distortion and a low noise is outputted from the output terminal. The isolation unit is connected between the amplifier and the filter, avoiding effects on the output impedance of the amplifier from the filter, so that a signal of a low distortion can be outputted.
    Type: Grant
    Filed: March 4, 2005
    Date of Patent: February 24, 2009
    Assignee: Panasonic Corporation
    Inventors: Toru Matsuura, Hisashi Adachi
  • Patent number: 7486155
    Abstract: A pulse width modulator circuit has two self-oscillating pulse width modulators and a synchronization circuit for synchronizing the two self-oscillating pulse width modulators. It also comprises an auxiliary-signal generating circuit for generating an auxiliary signal which is coupled into the two self-oscillating pulse width modulators.
    Type: Grant
    Filed: June 8, 2007
    Date of Patent: February 3, 2009
    Assignee: Infineon Technologies AG
    Inventors: Martin Clara, Andreas Wiesbauer, Thomas Poetscher, David San Segundo Bello, Sergio Walter
  • Patent number: 7463698
    Abstract: A transmitter has a peak reducing part carrying out peak reduction processing; an OFDM signal generating part generating an OFDM signal from an input information signal; a cyclic shifting part generating a signal obtained from cyclically shifting the OFDM signal; and an adding part adding the OFDM signal and the cyclically shifted signal together.
    Type: Grant
    Filed: May 18, 2005
    Date of Patent: December 9, 2008
    Assignee: NTT DoCoMo, Inc.
    Inventors: Hiromasa Fujii, Jiyun Shen, Takahiro Asai, Hirohito Suda
  • Patent number: 7427903
    Abstract: A polar modulator has a low AM-AM and AM-PM distortion comprises a phase locked loop. The phase locked loop is designed for outputting a high-frequency signal with a frequency derived from a phase modulation signal at an actuating input of the phase locked loop. A filter device, for suppressing a DC signal component, is coupled to an output of the phase locked loop. Furthermore, provision is made of a controllable voltage source with a control input suitable for feeding in an amplitude modulation signal. A push-pull amplifier is connected by an input to the filter device. It comprises two feedback amplifier transistors connected in series, which are connected to a voltage output of the controllable voltage source for supply purposes. Control terminals of the amplifier transistors are connected to the input and, via a load, to an output of the push-pull amplifier.
    Type: Grant
    Filed: November 22, 2005
    Date of Patent: September 23, 2008
    Assignee: Infineon Technologies AG
    Inventor: Giuseppe Li Puma
  • Patent number: 7426372
    Abstract: An apparatus and method for amplifying a radio frequency signal including, generating a plurality of shaped pulses utilizing a piecewise linearizer circuit, applying the plurality of shaped pulses to a first input of a radio frequency amplifier circuit, and injecting a radio frequency carrier into a second input of the radio frequency amplifier circuit. The apparatus comprises a piecewise linearizer (PWL) circuit coupled to the input of a Radio Frequency Digital to Analog Converter (RFDAC) operating as a signal amplifier.
    Type: Grant
    Filed: March 31, 2005
    Date of Patent: September 16, 2008
    Assignee: M/A-COM Eurotec B.V.
    Inventor: Gerard T. Quilligan
  • Publication number: 20080136691
    Abstract: An apparatus and method are described to increase the control resolution of an electronic device. In one embodiment, the invention includes a spread pulse modulation module to generate a first set of bits based on a second set of bits that is larger than the first set of bits. The spread pulse modulation module modulates the least significant bit (LSB) of the first set of bits based on information including the LSB modulation period and the LSB modulation duty cycle. The spread pulse modulation module also modulates the least significant bit of the first set of bits so that the least significant bit transitions at least twice from a high value to a low value during the modulation period. This embodiment of the invention also includes a digital-to-analog conversion module to generate an analog input signal to the electronic device based on the first set of bits.
    Type: Application
    Filed: August 22, 2007
    Publication date: June 12, 2008
    Inventors: Charles F. BARRY, Tian SHEN, Reed A. PARKER, Feng F. PAN, Meenakshi SUBRAMANIAN
  • Patent number: 7362819
    Abstract: A method of limiting at least one peak of a composite signal having multiple carriers signals involves placing energy in at least one bandwidth gap located between respective frequency bandwidths of carrier signals.
    Type: Grant
    Filed: June 16, 2004
    Date of Patent: April 22, 2008
    Assignee: Lucent Technologies Inc.
    Inventors: Frank Gerhard Ernst Obernosterer, Kumud Kumar Sanwal
  • Patent number: 7301417
    Abstract: Disclosed is a pulse width modulation method and apparatus capable of expressing as many values as possible in a pulse width modulation (PWM) period, while maintaining the center of pulse energy substantially equal to the center of the PWM period. For this end, prepared is the PWM pattern generator 20 including 2 kinds of PWM pulse generator 21 and 22 for generating pulses having the pulse width of 0˜N times of the reference clock period in 1 PWM period corresponding to a predetermined number N of the reference clock period. The PWM pulse generators 21 and 22 are properly switched by the switching circuit 30 under control of the control circuit 40 for performing time averaging process so that the centers of energy of the output pulses is substantially equal to the center of the PWM period.
    Type: Grant
    Filed: March 22, 2005
    Date of Patent: November 27, 2007
    Assignee: Digian Technology, Inc.
    Inventor: Yoshiaki Shinohara
  • Patent number: 7283012
    Abstract: A tri-state pulse density modulator includes a first switch device coupled to a high voltage, and a second switch device coupled to a low voltage. An adder receives a pulse density modulation (PDM) input signal and a latched input signal to generate an output sum signal and a carry signal. A latch module coupled with the adder latches the output sum signal with a clock signal to generate the latched input signal. A control circuit module responsive to the carry signal for selectively turns off the first and second switch devices to generate the PDM output signal at a tri-state voltage between the first and second voltages, or turns on the first or second switch device to generate the PDM output signal at the first or second voltage, respectively. Thus, the PDM output signal only switches between the tri-state voltage and either the first voltage or the second voltage.
    Type: Grant
    Filed: April 15, 2005
    Date of Patent: October 16, 2007
    Assignee: Via Telecom., Ltd.
    Inventor: Meoung-Jin Lim
  • Patent number: 7283011
    Abstract: A modulation method, referred to as dual phase pulse modulation (DPPM), represents digital data as a series of high and low pulses whose widths represent groups of M data bits, with both the high and low pulses representing successive M-bit groups. Each of the 2M possible data values for a group of M data bits uniquely corresponds to one of 2M distinct pulse widths. This modulation method is essentially clockless, with data being decoded from a signal by detecting each pulse's width with respect to the last transition. Power consumption is reduced by having M data bits represented for each pulse transition, and by using both the high and low pulses to represent data.
    Type: Grant
    Filed: April 29, 2004
    Date of Patent: October 16, 2007
    Assignee: Atmel Corporation
    Inventors: Daniel S. Cohen, Daniel J. Meyer, John L. Fagan
  • Patent number: 7280608
    Abstract: Methods and systems are provided for evaluating electrical characteristics of a transmitter in real time using cross-correlation of a reference signal with a signal transmitted by the transmitter. A code generator is configured to generate reference code and test code that both include a plurality of frames of data. The reference code is output at a first rate and the test code is output at a second rate that is different from the first rate. A modulator is configured to modulate the reference code into a first modulated code. A correlator is configured to correlate the first modulated code with test code that has been modulated and transmitted by a transmitter.
    Type: Grant
    Filed: May 27, 2003
    Date of Patent: October 9, 2007
    Assignee: The Boeing Company
    Inventor: George D. Salapski
  • Patent number: 7274266
    Abstract: A method is performed for influencing the signal shape of an output signal of an RF power resonance amplifier and an RF excitation arrangement including an RF power resonance amplifier. A basic signal of a basic frequency is amplified and modulated with a modulation signal, and an output oscillating circuit of the RF power resonance amplifier is tuned to a frequency in the range of the basic frequency, and is excited with the basic signal during normal operation. At times that are or can be predetermined, the output oscillating circuit is driven with a driving signal that differs from the basic signal, for a time period that is or can be predetermined. This reduces the dying down time of the output oscillating circuit and increases the steepness of the output signal edges.
    Type: Grant
    Filed: February 10, 2006
    Date of Patent: September 25, 2007
    Assignee: Huettinger Elektronik GmbH + Co. KG
    Inventor: Thomas Kirchmeier
  • Patent number: 7268638
    Abstract: The invention is a method for pulse position modulating signals which are synchronized to clocked bit periods using a clock comprising the steps of generating two, three or n signals to mark the presence of digital ones during corresponding n time slots occurring during the same bit period. The two, three or n signals are combined into a single data channel to utilize abrupt phase changes of pulses in a carrier signal at a carrier frequency, the phase changes having a very short duration to mark the presence of digital ones only. The combination of the n signals into a single data channel comprises gating each of the n signals in a sequence of serially delayed time slots corresponding to each of the n signals during a portion of the same bit period in the single data channel during time positions reserved for unexpressed zeroes.
    Type: Grant
    Filed: April 22, 2003
    Date of Patent: September 11, 2007
    Inventor: Harold R. Walker
  • Patent number: 7260156
    Abstract: A modulation identification device can be used for detecting the modulation type of a wirelessly transmitted and modulated RF signal without a-priori information on the kind of modulation used. The modulation identification device (1) comprises a n-port junction (17), n being an integer equal to or larger than three. The n-port junction (17) is supplied with the modulated RF signal (2) and a second RF signal (3) from a local oscillator. The n-port junction (17) outputs at least one third RF signal to at least one power detector (18). A signal processing unit (6) processes the power detected output of the n-port junction (17) to generate at least one flag (10) indicating the identified modulation type.
    Type: Grant
    Filed: June 26, 2001
    Date of Patent: August 21, 2007
    Assignees: Sony Corporation, Sony Deutschland GmbH
    Inventors: Dragan Krupezevic, Robert Morelos Zaragoza, Veselin Brankovic, Mohamed Ratni
  • Patent number: 7242262
    Abstract: In order to provide a high-speed-pulse polarity modulation circuit for realizing low power consumption and miniaturization and reducing noise occurring at a middle level which is a baseline for a bipolar pulse, a modulation circuit for converting a unipolar pulse into a bipolar pulse in accordance with a value of input data is structured such that differential transistor pairs are double stacked, and one of the differential transistor pairs in an upper stage outputs polarity modulation pulses, and a middle potential between logic high and low is applied to the gates of the other differential transistor pair the gates of which are coupled together.
    Type: Grant
    Filed: March 10, 2005
    Date of Patent: July 10, 2007
    Assignee: Fujitsu Limited
    Inventor: Yoichi Kawano
  • Patent number: 7206356
    Abstract: This wireless transmitter is composed of at least one modulator, which comprises a digital part and an analog part. The digital part comprises elements for generating the envelope of the signals to be transmitted and elements for generating the phase of the signals to be transmitted.
    Type: Grant
    Filed: March 25, 2003
    Date of Patent: April 17, 2007
    Assignee: Canon Kabushiki Kaisha
    Inventors: Philippe Le Bars, Alain Sehan
  • Patent number: 7180384
    Abstract: Universal signal modulators structures are shown which are particularly useful for selectively generating polar-modulated digital sequences from input phase and amplitude symbols and for generating quadrature-modulated digital sequences from input first and second quadrature symbols. Significantly, the modulation structure (quadrature modulation or polar modulation) of these embodiments can selected by simply changing the state of a mode command.
    Type: Grant
    Filed: May 23, 2005
    Date of Patent: February 20, 2007
    Assignee: Analog Devices, Inc.
    Inventors: Dimitrios Efstathiou, Ken Gentile
  • Patent number: 7154923
    Abstract: Techniques are disclosed for providing modulation current that includes output impedance compensation with a feed-forward bandwidth enhancement and pre-distortion modulation to control waveform transition symmetry. A feedback circuit senses output node voltage and increases the overdrive voltage of a current source. This offsets the loss of current due to channel length modulation and increases the effective output impedance of the source. A feed-forward circuit enhances the bandwidth of the impedance compensation feedback loop. Waveform transition symmetry is improved by pre-distorting a laser modulation current by introducing an undershoot current on the falling edge of the modulating current.
    Type: Grant
    Filed: August 24, 2004
    Date of Patent: December 26, 2006
    Assignee: International Business Machines Corporation
    Inventor: Daniel Kucharski
  • Patent number: 7119629
    Abstract: A synchronized controlled oscillation modulator (SCOM), comprising at least one, Controlled Oscillation Modulator (5), and synchronizing means (1, 6) connected to said COM modulator. The modulator can comprise several COM modulators, and the synchronizing means can be arranged between the COM systems, so that the oscillation modulator signal is used as synchronization signal. The invention provides significant advantages in performance, topological simplification, improved robustness, stability and efficiency compared to prior art.
    Type: Grant
    Filed: December 16, 2002
    Date of Patent: October 10, 2006
    Assignee: Bang & Olufsen Icepower A/S
    Inventors: Karsten Nielsen, Jesper Lind Hansen
  • Patent number: 7078982
    Abstract: A method for emitting a predetermined series of pulses on an electricity distribution network carrying a determined voltage includes linking an electric element to the network by a switch and supplying a control signal to the switch. The switch is driven by the control signal, such that high frequency spurious pulses are emitted at the rate of the control signal. According to one embodiment, the control signal is data bearing, such that data-bearing high frequency spurious pulses are emitted at the rate of the control signal.
    Type: Grant
    Filed: November 24, 2004
    Date of Patent: July 18, 2006
    Assignee: Watteco
    Inventor: Paul Bertrand