Pulse Amplitude Modulator Patents (Class 332/115)
  • Patent number: 9838018
    Abstract: An additively manufactured apparatus having a gas filled sealed cavity containing at least two additively manufactured cathodes and an additively manufactured anode spaced from the cathodes such that a continuous electric discharge of the gas stimulated between at least one of the cathodes and the anode provides a Boolean function output at the anode corresponding to electrical input signals at two of the cathodes.
    Type: Grant
    Filed: June 23, 2016
    Date of Patent: December 5, 2017
    Assignee: British Telecommunications PLC
    Inventor: Robert Ghanea-Hercock
  • Patent number: 9093954
    Abstract: A BASK demodulator includes a signal modifying circuit and a low pass filter (LPF) that couples an amplifier to an output of the modifying circuit. The modifying circuit includes a signal scaling circuit, a rectifying circuit and an AC coupling circuit. A signal shaping circuit couples an output of the amplifier to an output of the demodulator. The signal scaling circuit scales an input BASK modulated signal to provide an unclipped scaled and biased alternating signal that alternates about a bias voltage at a minimum carrier frequency. The rectifying circuit rectifies the unclipped signal to provide a partially rectified signal that is decoupled by the AC coupling circuit to provide a clipped scaled and biased alternating signal. The LPF removes the signal from the clipped scaled and biased alternating signal to provide a demodulated signal, which then is amplified by the amplifier and shaped by the shaping circuit.
    Type: Grant
    Filed: August 12, 2013
    Date of Patent: July 28, 2015
    Assignee: FREESCALE SEMICONDUCTOR, INC.
    Inventors: Wanfu Ye, Xiang Gao, Dongpeng Hou
  • Patent number: 8907738
    Abstract: A circuit includes a switched modulator stage combining an information signal with a square wave carrier to produce a first modulated signal; and a second modulation stage forming additional steps in the first modulated signal to produce a second modulated signal.
    Type: Grant
    Filed: March 13, 2013
    Date of Patent: December 9, 2014
    Assignee: Cypress Semiconductor Corporation
    Inventor: Dennis R Seguine
  • Patent number: 8909381
    Abstract: An irrigation control device having a modulator that modulates data onto an alternating power signal by distorting amplitude of a first leading portion of selected cycles of the alternating power signal, and permit effectively a full amplitude of the alternating power signal on a following portion of the selected cycles, wherein the first leading portion and the following portion are either both on a high side of a cycle or both on a low side of a cycle of the alternating power signal. The irrigation control device further includes an interface configured to couple the modulator to a multi-wire interface coupled to a plurality of irrigation devices to permit the alternating power signal to be applied to the multi-wire interface.
    Type: Grant
    Filed: August 9, 2013
    Date of Patent: December 9, 2014
    Assignee: Rain Bird Corporation
    Inventor: Timothy J. Crist
  • Patent number: 8908778
    Abstract: A rail-to-rail comparator including a first comparison unit connected to a first terminal and configured to compare differential input signals to differential reference voltages; a second comparison unit connected to a second terminal and configured to compare the differential input signals to the differential reference voltages; and an output unit configured to be driven in response to a clock signal and to generate a complementary output signal according to comparison results of the first and second comparison units.
    Type: Grant
    Filed: August 21, 2012
    Date of Patent: December 9, 2014
    Assignee: SK Hynix Inc.
    Inventors: Jin Il Chung, Jun Hyun Chun, Jin Wook Burm, Dae Ho Yun
  • Patent number: 8907737
    Abstract: Techniques and mechanisms for configuring logic to implement a signal modulation. In an embodiment, the logic includes a finite impulse response (FIR) module comprising circuitry. The selection circuitry may be operable to concurrently receive signals from latch circuitry of the FIR module and, based on the signals, to select an input group of the selection circuitry and to output a voltage identifier. In another embodiment, configuration logic is operable to set an operational mode which determines a total number of concurrent input signals, received by the FIR module, which the FIR module will use to select an input group for generating an output representing a voltage level.
    Type: Grant
    Filed: December 28, 2012
    Date of Patent: December 9, 2014
    Assignee: Intel Corporation
    Inventors: Harry Muljono, Donald L. Faw, Charlie Lin, Stefan Rusu
  • Publication number: 20140294206
    Abstract: An asymmetric modulation scheme may be used to drive two output nodes coupled to a load. The asymmetric modulation scheme may be one-sided such that the switching rate of a first output node is lower than the switching rate of a second output node. The first output node may be switched only to change a direction of current between the first output node and the second output node, while the second output node is switched to convey the information of an input signal. The asymmetric modulation scheme may be used to drive a speaker to reduce noise at the first output node to improve accuracy of current monitoring through the speaker by a current monitor coupled at the first output node.
    Type: Application
    Filed: August 13, 2013
    Publication date: October 2, 2014
    Applicant: CIRRUS LOGIC, INC.
    Inventors: Dan Shen, Frank Cheng, Lingli Zhang
  • Patent number: 8787497
    Abstract: The present invention relates to a method of transmitting and a method of receiving signals and corresponding apparatus. One aspect of the present invention relates to an efficient L1 signaling method for an efficient transmitter and an efficient receiver using the efficient L1 signaling method for an efficient cable broadcasting.
    Type: Grant
    Filed: July 23, 2009
    Date of Patent: July 22, 2014
    Assignee: LG Electronics Inc.
    Inventors: Woo Suk Ko, Sang Chul Moon
  • Publication number: 20140184349
    Abstract: Techniques and mechanisms for configuring logic to implement a signal modulation. In an embodiment, the logic includes a finite impulse response (FIR) module comprising circuitry. The selection circuitry may be operable to concurrently receive signals from latch circuitry of the FIR module and, based on the signals, to select an input group of the selection circuitry and to output a voltage identifier. In another embodiment, configuration logic is operable to set an operational mode which determines a total number of concurrent input signals, received by the FIR module, which the FIR module will use to select an input group for generating an output representing a voltage level.
    Type: Application
    Filed: December 28, 2012
    Publication date: July 3, 2014
    Inventors: Harry Muljono, Donald L. Faw, Charlie Lin, Stefan Rusu
  • Patent number: 8711956
    Abstract: A communications system may include a first communications device that may include a transmitter and a modulator cooperating therewith to modulate a coded waveform using a constant phase modulation (CPM) to generate a non-linear CPM waveform, and generate a linear representation of the non-linear CPM waveform, the linear representation including a plurality of pulses. The transmitter and a modulator may further cooperate to remove at least some of the plurality of pulses to define a modified linear representation of the non-linear CPM waveform, and transmit the modified linear representation of the non-linear CPM waveform. The communications system may further include a second communications device that may include a receiver and a single pulse-matched filter linear demodulator cooperating therewith to demodulate the modified linear representation of the non-linear CPM waveform transmitted from the first communications device.
    Type: Grant
    Filed: February 7, 2011
    Date of Patent: April 29, 2014
    Assignee: Harris Corporation
    Inventor: Michael A. Wadsworth
  • Patent number: 8581672
    Abstract: An apparatus including a spin torque oscillator configured to receive an input electric current and to produce a radio frequency output signal; and a tunable current source for providing an input electric current to the spin torque oscillator.
    Type: Grant
    Filed: May 14, 2010
    Date of Patent: November 12, 2013
    Assignee: Nokia Corporation
    Inventors: Pirjo Pasanen, Vladimir Ermolov, Markku Anttoni Oksanen, Martti Voutilainen, Eira Seppala
  • Patent number: 8509318
    Abstract: Apparatus and methods are described that enable concurrent transmission of multiple data signals including clock, synchronization, and power over a single-wire bus between a master device and one or more slave devices. A first transmission channel from the master device to the slave device may modulate the width of periodic pulses between a first voltage level and a second voltage level with respect to a reference potential. A second transmission channel may modulate the amplitude of at least one of the first and second voltage levels to at least one third voltage level. Concurrent communications between a master device and one or more slave devices over a single-wire bus can be achieved.
    Type: Grant
    Filed: July 16, 2009
    Date of Patent: August 13, 2013
    Assignee: STMicroelectronics (Rousset) SAS
    Inventor: François Tailliet
  • Publication number: 20130147570
    Abstract: Methods and apparatus provide for: detecting an identification (ID) number associated with a piece of information technology (IT) equipment using a first computer-readable and executable program running on the piece of IT equipment; modulating a power usage of the piece of IT equipment as a function of the ID number using the first program running on the piece of IT equipment; monitoring the power usage of the piece of IT equipment using a power distribution unit (PDU) that provides operating power to the piece of IT equipment; and detecting modulation in the power usage of the piece of IT equipment caused by the first program running on the piece of IT equipment, such detection being performed using a second computer-readable and executable program running on the PDU.
    Type: Application
    Filed: December 9, 2011
    Publication date: June 13, 2013
    Applicant: Raritan Americas, Inc.
    Inventors: Swen ANDERSON, Christian Paetz
  • Patent number: 8457243
    Abstract: A baseband signal generator (102a) provides a polar signal (A, I p) to a processing sub-unit (704p). The processing sub-unit (704p) receives furthermore feedback signals from a down converting unit (704c) which feedback signals are used to determine the magnitude (B) of the amplified output signal and the actual error phase. The magnitude (A) of the polar signal and the determined magnitude (B) are applied to a comparator (710) having its output connected to the input of a predistortion unit (214, 216). The output of the predistortion unit (214, 216) is connected to the input of a pulse width modulating unit (210, 212) which comprises a mapping unit (210) outputting two constant magnitude signals. The actual error phase and the phase component of the polar signal are used to generate a corrected phase component which is applied to a further mapping unit (202) forming part of a phase modulating unit (202, 204).
    Type: Grant
    Filed: December 3, 2008
    Date of Patent: June 4, 2013
    Assignee: NXP B.V.
    Inventor: Jan S. Vromans
  • Patent number: 8289098
    Abstract: Exemplary gate pulse modulation circuit and sloping modulation method applied thereto are provided. The gate pulse modulation circuit has an output terminal and includes a voltage modulation circuit and a comparator control circuit. The voltage modulation circuit is electrically coupled between a gate power supply voltage and a second voltage and subjected to the control of a sloping control signal to perform a sloping operation and then output a sloped voltage signal. The comparator control circuit includes a comparing unit and a switching unit. First and second input terminals of the comparing unit respectively are electrically coupled to a node and a first voltage. During the voltage modulation circuit performing the sloping operation, a magnitude relationship between a voltage on the node and the first voltage decides on-off states of the switching unit and thereby decides the moment of the first voltage delivered to the output terminal.
    Type: Grant
    Filed: November 8, 2010
    Date of Patent: October 16, 2012
    Assignee: Au Optronics Corp.
    Inventors: Meng-Sheng Chang, Chia-Tsung Chaing
  • Patent number: 8138825
    Abstract: A multi-chip stack structure and a signal transmission method are disclosed in specification and drawing, where the multi-chip stack structure includes first and second chips. The first chip includes a first inductance coil with a first series capacitor, and the second chip includes a second inductance coil with a second series capacitor. The first and second inductance coils are magnetically coupled to each other. The magnetically coupled inductance coils and the capacitors constitute a coupling filter.
    Type: Grant
    Filed: May 21, 2010
    Date of Patent: March 20, 2012
    Assignee: National Taiwan University
    Inventors: Hsin-Chia Lu, Guan-Ming Wu, Chun Pan
  • Patent number: 8116406
    Abstract: Provided are an apparatus and method for generating a soft bit metric and a multi-level (M-ary) Quadrature Amplitude Modulation (QAM) receiving system using the same. The apparatus includes an analog to digital converter for converting an analog symbol signal of a demodulated I (Inphase) or Q (Quadrature) channel into a digital signal, a scaler for scaling the converted digital signal based on a reference value used for determining a space between symbols, a positive integer converter for calculating a positive integer of the scaled digital I or Q channel symbol signal, a sign determinator for determining a sign of the scaled digital I or Q channel symbol signal, and a bit information converter for converting the scaled digital I or Q channel symbol signal into soft bit metric information per bit on the basis of the calculated positive integer and the determined sign value.
    Type: Grant
    Filed: December 7, 2006
    Date of Patent: February 14, 2012
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Dae-Ig Chang, Deock-Gil Oh, Kwang-Min Hyun, Dong-Weon Yoon, Sang-Kyu Park
  • Patent number: 8068571
    Abstract: Systems (400, 500, 600) and methods (300) for generating a chaotic amplitude modulated signal absent of cyclostationary features by preserving a constant variance. The methods involve: generating a PAM signal including pulse amplitude modulation having a periodically changing amplitude; generating a first part of a constant power envelope signal (FPCPES) by dividing the PAM signal by a square root of a magnitude of the PAM signal; generating a second part of the constant power envelope signal (SPCPES) having a magnitude equal to a square root of one minus the magnitude of the PAM signal; and generating first and second spreading sequences (FSS and SSS). The methods also involve combining the FPCPES with the FSS to generate a first product signal (FPS) and combining the SPCPES with the SSS to generate a second product signal (SPS). A constant power envelope signal is generated using the FPS and SPS.
    Type: Grant
    Filed: June 12, 2008
    Date of Patent: November 29, 2011
    Assignee: Harris Corporation
    Inventors: David B. Chester, Alan J. Michaels
  • Publication number: 20110215158
    Abstract: A passive RFID transponder includes a coder and a modulator. The coder generates a digital coded data stream based on a digital data stream to be transmitted. The digital coded data stream includes an initialization bit sequence having a maximum data frequency of the digital coded data stream. Furthermore, the digital coded data stream changes its value at the latest after a predefined number of bits. The modulator modulates an amplitude of a carrier signal with the digital coded data stream to provide an amplitude-modulated coded signal.
    Type: Application
    Filed: March 4, 2011
    Publication date: September 8, 2011
    Applicant: INFINEON TECHNOLOGIES AG
    Inventors: Walter Kargl, Edmund Ehrlich
  • Patent number: 7979036
    Abstract: Disclosed is a novel design of a fully integrated UWB transmitter. The transmitter includes a pulse generator, a pulse modulator, and an ultra-wideband drive amplifier. A new low voltage low power pulse generator circuit is disclosed which can be fully integrated in CMOS or BiCMOS process. This circuit includes a squaring stage, an exponential stage, and a second-order derivative stage. Based on this, PPM, BPSK and PAM pulse modulator circuits and system are disclosed. The modulated pulse is symmetrical second-order derivative Gaussian pulses with a bandwidth up to 5 GHz and having sufficient swing for UWB applications. An ultra-wideband driver amplifier is proposed to amplify the modulator output and drive the antenna. For the driver amplifier, common source resistor and inductor shunt feedback with current reuse technique is employed to achieve the ultra-wideband bandwidth, high gain, and providing matching for the antenna simultaneously.
    Type: Grant
    Filed: December 30, 2004
    Date of Patent: July 12, 2011
    Assignee: Agency for Science, Technology and Research
    Inventor: Yuan Jin Zheng
  • 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: 7898354
    Abstract: It is an object of the invention to provide a pulse generation circuit and a modulator for realizing a high On/Off ratio in a small circuit scale and with lower power consumption. A short pulse generation circuit according to the invention includes an oscillator 101, a control signal generation circuit 102, an intermittent frequency multiplier 103, a filter 104, and an output terminal 105. The oscillator 101 and the intermittent frequency multiplier 103 are active circuits implemented as active elements. A continuous signal is output from the oscillator 101 and is input to the intermittent frequency multiplier 103 and the intermittent frequency multiplier 103 intermittently operates according to a control signal output from the control signal generation circuit 102, thereby generating a short pulse signal, and a spurious component is removed through the filter.
    Type: Grant
    Filed: June 20, 2007
    Date of Patent: March 1, 2011
    Assignee: Panasonic Corporation
    Inventors: Shigeru Kobayashi, Michiaki Matsuo, Suguru Fujita
  • Publication number: 20110012766
    Abstract: A sigma-delta modulator for an ADC, passes an input signal to a loop filter, then to a multi-bit quantizer of the modulator. An output of the quantizer is passed to a digital filter, and a feedback signal is passed back to the loop filter, the feedback signal having fewer bits than are produced by the multi-bit quantizer. The digital filter has an order greater than one in the passband of the sigma-delta modulator.
    Type: Application
    Filed: June 18, 2010
    Publication date: January 20, 2011
    Applicant: ST-ERICSSON SA
    Inventor: Robert Henrikus Margaretha Van Veldhoven
  • Patent number: 7786818
    Abstract: An electronic component includes an RFID transponder, and also a security document comprises such an electronic component. The electronic component has a modulator for modulating a carrier signal, the modulator being constructed from at least two organic field effect transistors.
    Type: Grant
    Filed: December 6, 2005
    Date of Patent: August 31, 2010
    Assignee: PolyIC GmbH & Co. KG
    Inventors: Markus Bohm, Walter Fix, Andreas Ullmann
  • 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
  • Publication number: 20100045377
    Abstract: A switching amplifier includes a modulator, which includes a pulse generator. The pulse generator generates positive and negative pulses, in response to an input signal, and the frequency of the negative pulses can be controlled independently of the frequency of the positive pulses. The positive pulses and negative pulses are combined to form a composite pulse stream, which can be low-pass filtered such that the filter output is an amplified version of the input signal.
    Type: Application
    Filed: August 31, 2007
    Publication date: February 25, 2010
    Inventor: Clyde Witchard
  • Patent number: 7667511
    Abstract: Efficient PAM transmit modulation is provided by a PAM modulator that includes an oscillator (404) that provides a clock signal, CKV, (408). The clock signal 408 and a delayed version (CKV_DLY) 420 of the clock signal are provided to a logic gate (414). The output of logic gate (414) is used as a power amplifier input signal (PA_IN) for radio frequency power amplifier (416). Depending on the relative time delay of the CKV clock signal (408) and the CKV_DLY delayed clock signal (420), the timing and duty cycle of the logic gate (414) duty cycle can be controlled. The duty cycle or pulse-width variation affects the turn-on time of the power amplifier (416); thereby establishing the RF output amplitude.
    Type: Grant
    Filed: August 2, 2005
    Date of Patent: February 23, 2010
    Assignee: Texas Instruments Incorporated
    Inventors: Robert B. Staszewski, Dirk Leipold, Kenneth J. Maggio
  • Patent number: 7668256
    Abstract: Methods and apparatus are described for generating and receiving amplitude and differential-phase encoded signals in which the number of phase states at a given amplitude level is always less than or equal to that at a higher amplitude level and at least two amplitude levels have different numbers of phase states.
    Type: Grant
    Filed: July 20, 2006
    Date of Patent: February 23, 2010
    Assignee: Alcatel-Lucent USA Inc.
    Inventors: Randy C Giles, Xiang Liu
  • Patent number: 7639098
    Abstract: A pulse amplitude modulation (PAM) signal generator that injects a copy of a pulse into the PAM baseband signal prior to frequency upconversion and power amplification. The pulse comprises a function of, or an extra copy of, a pulse in the PAM baseband signal. The pulse injector analyzes the PAM baseband signal for times when a predetermined threshold is exceeded and forms a pulse that is constructed and arranged to reduce the amplitude of the PAM baseband signal to a desired peak amplitude when the pulse is added to the PAM baseband signal.
    Type: Grant
    Filed: March 5, 2008
    Date of Patent: December 29, 2009
    Assignee: Panasonic Corporation
    Inventors: Stephen V. Schell, Richard W. D. Booth
  • Patent number: 7634022
    Abstract: A phase modulation section (101) generates a first modulated signal including phase information. An amplitude signal control section (103) generates a second modulated signal including amplitude information. A waveform shaping section (104), when an amplitude of the second modulated signal is larger than a regulated value generates a waveform-shaped modulated signal. An amplitude modulated voltage supply section (105) amplifies the waveform-shaped modulated signal based on the supply voltage from a voltage control section (106) and supplies the amplified signal to a power amplification section (102). The power amplification section (102) amplifies the first modulated signal based on the amplitude modulated voltage, and outputs the resultant signal.
    Type: Grant
    Filed: January 6, 2006
    Date of Patent: December 15, 2009
    Assignee: Panasonic Corporation
    Inventors: Shigeru Morimoto, Toru Matsuura, Hisashi Adachi
  • Publication number: 20090174495
    Abstract: In a contactless IC card system, a modulating circuit manufactured in an IC form is operable at a high power efficiency. The demodulating apparatus is configured to include: first signal output means for outputting a first output signal having a predetermined phase with respect to that of an input signal, a second signal output means for outputting a second output signal having a predetermined phase with respect to that of the input signal, gate means for gating at least the second output signal, calculation means for adding, or subtracting the first output signal and the second output signal; and control means for controlling the operation of the gate means in response to a logic level of input data.
    Type: Application
    Filed: February 17, 2009
    Publication date: July 9, 2009
    Applicant: SONY CORPORATION
    Inventor: Shigeru Arisawa
  • Publication number: 20090108951
    Abstract: A pulse amplitude modulation (PAM) signal generator that injects a copy of a pulse into the PAM baseband signal prior to frequency upconversion and power amplification. The pulse comprises a function of, or an extra copy of, a pulse in the PAM baseband signal. The pulse injector analyzes the PAM baseband signal for times when a predetermined threshold is exceeded and forms a pulse that is constructed and arranged to reduce the amplitude of the PAM baseband signal to a desired peak amplitude when the pulse is added to the PAM baseband signal.
    Type: Application
    Filed: March 5, 2008
    Publication date: April 30, 2009
    Inventors: Stephan V. Schell, Richard W.D. Booth
  • Patent number: 7346119
    Abstract: The present invention relates in general to a method, apparatus, and article of manufacture for providing high-speed digital communications through a communications channel. In one aspect, the present invention employs adaptive or adjustable equalization circuitry and techniques in the transmitter and/or receiver to enhance the system performance of, for example, a system using the PAM-4 coding.
    Type: Grant
    Filed: April 16, 2003
    Date of Patent: March 18, 2008
    Assignee: Synopsys, Inc.
    Inventors: James Gorecki, John T. Stonick, Un-Ku Moon
  • Patent number: 7289005
    Abstract: A polar modulator contains a phase locked loop which is designed to emit a radio-frequency signal at one frequency to one output, with the frequency being derived from the reference signal and from a phase modulation signal at a control input of the phase locked loop. The modulator additionally has a second signal input for supplying an amplitude modulation signal. The second signal input is connected to a control input of a pulse width modulator, one of whose signal inputs is coupled to the output of the phase locked loop. The pulse width modulator is designed to vary the duty ratio of a signal which is applied to the signal input, with this variation being adjustable via a regulation signal at the control input. A filter can be connected downstream from the output of the pulse width modulator and suppresses higher harmonic components in a signal which can be tapped off at the output of the pulse width modulator.
    Type: Grant
    Filed: December 16, 2005
    Date of Patent: October 30, 2007
    Assignee: Infineon Technologies AG
    Inventor: Giuseppe Li Puma
  • Patent number: 7283013
    Abstract: In a contactless IC card system, a modulating circuit manufactured in an IC form is operable at a high power efficiency. The demodulating apparatus is configured to include: first signal output means for outputting a first output signal having a predetermined phase with respect to that of an input signal, a second signal output means for outputting a second output signal having a predetermined phase with respect to that of the input signal, gate means for gating at least the second output signal, calculation means for adding, or subtracting the first output signal and the second output signal; and control means for controlling the operation of the gate means in response to a logic level of input data.
    Type: Grant
    Filed: September 14, 2005
    Date of Patent: October 16, 2007
    Assignee: Sony Corporation
    Inventor: Shigeru Arisawa
  • 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: 7224737
    Abstract: To significantly reduce mobile station static power consumption, and to make it possible to use a high speed asynchronous link in the mobile station, the invention uses one of the amplitude levels of, preferably, a PAM-5 (Pulse Amplitude Modulation with five amplitude levels) modulation technique as a strobe signal to generate a change in the transmitted signal. The change in the transmitted signal makes it possible for a PAM-5 receiving circuit to sample and decode two consecutive occurrences of the same data bits. The use of this invention avoids the requirement to include an oscillator in the PAM-5 receiver, or to dedicate a signal line to transmit a clock signal from the transmitter to the receiver.
    Type: Grant
    Filed: October 10, 2003
    Date of Patent: May 29, 2007
    Assignee: Nokia Corporation
    Inventor: Martti Voutilainen
  • Patent number: 7164722
    Abstract: A radio communications system in which a desired signal can be accurately discriminated from interfering signals, even when signals from a plurality of transmitters are received simultaneously, in which a transmitter communicates information using signals that are repeated over predetermined periods. A pulse generator generates pulses having a predetermined repetition period based on an information bit to be communicated, and the pulses generated by the pulse generator are transmitted. A pulse amplitude altering unit controls the amplitude of the pulses to be transmitted in accordance with a predefined pattern under the control of a control unit.
    Type: Grant
    Filed: August 9, 2002
    Date of Patent: January 16, 2007
    Assignee: Sony Corporation
    Inventor: Kazuhisa Takamura
  • Patent number: 7120397
    Abstract: An SSB radio communication system and radio apparatus applicable to ultra high frequencies such as a VHF band and UHF band. In the transmitting side, a carrier wave is amplitude modulated by modulation input signals which comprise a constant amplitude, sine wave shaped reference pulse having a predetermined width and period and a sine wave shaped modulation pulse signal having an amplitude representing two- or multi-value digital values having the same width as the reference pulse signal and which are formed based on the amplitude of the reference pulse signal, and the modulated pulse signals are transmitted on a single side band, while in its receiving side the gain of received signals is automatically adjusted based on the reference pulse signal that is the value of the peak of the received signals.
    Type: Grant
    Filed: August 21, 2001
    Date of Patent: October 10, 2006
    Inventors: Masaki Tatemori, Yoji Makishima
  • Patent number: 6985540
    Abstract: An AM demodulator includes an APC detection circuit that compares phases of an AM-modulated input signal and a signal output from a VCO. However, the APC detection circuit multiples the two signals before their comparison. As a result, even if the phases of the input signal or the signal output from the VCO is shifted by 180 degrees, the result of comparison by the APC detection circuit is not influenced by the phase shift. Moreover, when a signal detected by the AM detection circuit is in a potential range showing over-modulation, operation of a PLL circuit is stopped.
    Type: Grant
    Filed: November 6, 2001
    Date of Patent: January 10, 2006
    Assignee: Renesas Technology Corp.
    Inventor: Osamu Nishikido
  • Patent number: 6903619
    Abstract: A transceiver and transmitter are shown. A baseband processor receives a signal for transmission. It converts the signal into amplitude and phase polar components. Each component is then processed—the phase component through a wideband phase modulator and the amplitude component through a wideband amplitude modulator, and the components are then recombined for further processing or transmission.
    Type: Grant
    Filed: June 4, 2003
    Date of Patent: June 7, 2005
    Assignee: M/A-Com, Inc.
    Inventors: Anthony Dennis, Yongwen Yang, Walid Ahmed, Radwan Husseini, David Bengtson
  • Patent number: 6888887
    Abstract: An optical processor for controlling a phased antenna array uses a frequency-shifted feedback cavity (FSFC), which includes a traveling-wave cavity. The FSFC incrementally delays and incrementally frequency shifts optical signals circulating in the traveling-wave cavity. Optical signals coupled out of the FSFC are separated by frequency, hence by delay, and processed to control either or both transmit and receive beam-forming operations. The FSFC provides a receiver with multiple receive signals which have incremental values of frequency. Each frequency corresponds to an incremental time sampling of optical signals input into the FSFC. Transmit signals coupled out of the FSFC have frequency and phase relationships that result in short time-domain pulses when combined. Controlling modulation and frequency of the transmit signals achieves carrier interference multiple access, a new type of spread-spectrum communications.
    Type: Grant
    Filed: September 10, 1999
    Date of Patent: May 3, 2005
    Inventor: Steve J. Shattil
  • Patent number: 6624712
    Abstract: A voltage (Vo) is added to an envelope function and input into a switching modulator (105). The output of the switching modulator (VSUP) is input to a linear regulator (103) where amplitude compensation of VSUP takes place and is output as VPA. VPA is then used to accomplish envelope modulation of a power amplifier (101). The value chosen for Vo is chosen to be adequate to maintain VSUP(t)>VPA(t) over all time.
    Type: Grant
    Filed: June 11, 2002
    Date of Patent: September 23, 2003
    Assignee: Motorola, Inc.
    Inventors: Lawrence Cygan, Andrew Khan
  • Patent number: 6624711
    Abstract: A voltage (Vo) is added to an envelope function and input into a switching modulator (105). The output of the switching modulator (VSUP) is input to a linear regulator (103) where amplitude compensation of VSUP takes place and is output as VPA. VPA is then used to accomplish envelope modulation of a power amplifier (101). The value chosen for Vo is chosen to be adequate to maintain VSUP(t)>VPA(t) over all time.
    Type: Grant
    Filed: June 11, 2002
    Date of Patent: September 23, 2003
    Assignee: Motorola, Inc.
    Inventors: Andrew Khan, Lawrence Cygan
  • Patent number: 6617818
    Abstract: A DC brushless motor operation speed control method is disclosed. First, a linearly voltage dependent current source is used to charge a capacitor and the terminal voltage of the capacitor is coupled to a linearly voltage dependent base frequency level detector. When the output voltage of the capacitor reaches the base frequency reference voltage, the signal output from the base frequency level detector will make the capacitor discharge, outputting a series of base frequency triangular waves. Under different supply voltages, all the generated base frequency triangular waves have the same cycle time. The base frequency triangular waves are transmitted to a speed control comparator. Through pulse width modulation, the speed control reference voltage adjusts the output pulse width of the comparator and thereby controls the speed of the motor.
    Type: Grant
    Filed: August 10, 2001
    Date of Patent: September 9, 2003
    Assignee: Prolific Technology Inc.
    Inventors: Chia-Chang Hsu, Chih-Shih Yang
  • Patent number: 6617938
    Abstract: Direct up-conversion of a signal is accomplished using a sampling pulse generator circuit and a gated differential amplifier, enabled by the sampling signal. When not enabled, the output of the differential amplifier is pulled to zero. The sampling pulse is generated from a base frequency sine wave which is squared with a limiting amplifier, and further passed through one or more frequency doublers producing a times two signal, a times four signal and so on. The squared base frequency and frequency doubled signals are logically ORed to produce a short duration pulse which repeats at the frequency of the base signal. The resulting output is an amplitude modulated pulse doublet time domain waveform.
    Type: Grant
    Filed: April 1, 2002
    Date of Patent: September 9, 2003
    Inventor: James J. Komiak
  • Patent number: 6535564
    Abstract: A method and apparatus for adaptively quantizing a digital signal prior to digital-to-analog conversion during pulse shaping in a pulse-amplitude modulated (PAM) system. In the method and apparatus, scaling constants applied to the input signal prior to digital-to-analog conversion change according to the time-varying periodic probability density function (pdf) of the input signal. Spectral components added to the signal due to the adaptive scaling of the method may be removed by performing adaptive amplification on the output signal of the DAC before transmission as a PAM signal.
    Type: Grant
    Filed: June 30, 1999
    Date of Patent: March 18, 2003
    Assignee: Nokia Mobile Phones Ltd.
    Inventor: Giridhar D. Mandyam
  • Patent number: 6532260
    Abstract: A device for transmitting a pulse signal via a metallic line to a receiver end at which equalization is applied to the received pulse signal. The device includes a waveform adjustment unit which adjusts a pulse width in accordance with differences between characteristics of the metallic line and characteristics that are assumed for the equalization at the receiver end. The device further includes a transmission driver unit which transmits a pulse having the adjusted pulse width to the metallic line.
    Type: Grant
    Filed: October 26, 1999
    Date of Patent: March 11, 2003
    Assignee: Fujitsu Limited
    Inventor: Masakazu Oi
  • Publication number: 20020180547
    Abstract: Efficient PAM transmit modulation is provided by a PAM modulator that includes an oscillator (404) that provides a clock signal, CKV, (408). The clock signal 408 and a delayed version (CKV_DLY) 420 of the clock signal are provided to a logic gate (414). The output of logic gate (414) is used as a power amplifier input signal (PA_IN) for radio frequency power amplifier (416). Depending on the relative time delay of the CKV clock signal (408) and the CKV_DLY delayed clock signal (420), the timing and duty cycle of the logic gate (414) duty cycle can be controlled. The duty cycle or pulse-width variation affects the turn-on time of the power amplifier (416); thereby establishing the RF output amplitude.
    Type: Application
    Filed: May 22, 2002
    Publication date: December 5, 2002
    Inventors: Robert B. Staszewski, Dirk Leipold, Kenneth J. Maggio
  • Publication number: 20010033612
    Abstract: To determine the channel characteristic of a channel (CHANNEL) between a transmitter (TX) and a receiver (RX), a predetermined periodic signal of pulse amplitude modulated symbols is modulated on waveforms by a cosine modulated filter bank (DWMT MOD) in the transmitter (TX), and the waveforms are transmitted over the channel (CHANNEL). In the receiver (RX), the received pulse amplitude modulated symbols are demodulated from the waveforms by a cosine modulated filter bank (DWMT DEMOD), pairs of the received pulse amplitude modulated symbols are combined to form received quadrature amplitude modulated symbols, and the received quadrature amplitude modulated symbols are divided by the transmitted predetermined pulse amplitude modulated symbols considered pairwise as transmit quadrature amplitude modulated symbols. So, samples of the channel characteristic are generated.
    Type: Application
    Filed: March 6, 2001
    Publication date: October 25, 2001
    Inventor: Miguel Peeters