Amplitude Modulator Patents (Class 332/149)
  • Patent number: 10123128
    Abstract: According to one aspect, there is provided a speaker comprising a body, a surface structure rigidly attached to the body, electro-magnetic deformable plate elements attached to the rigid planar surface structure and configured to bend, when driven with voltage or current source, the surface structure, and electro-magnetic deformable plate element specific band-pass filter for at least one electro-magnetic deformable plate element of the electro-magnetic deformable plate elements, the band-pass filter having at least one electro-magnetic deformable plate element specific pass band.
    Type: Grant
    Filed: September 7, 2016
    Date of Patent: November 6, 2018
    Assignee: Microsoft Technology Licensing, LLC
    Inventor: Matti Pellikka
  • Patent number: 10098129
    Abstract: A radio frequency communication device (100, 320) comprising a radio frequency communications interface (130) and a controller (110), wherein said controller (110) is configured to: establish network communication with a network node (200, 310) and to establish device-to-device communication with a second radio frequency communication device (325) via said radio frequency communication interface (130).
    Type: Grant
    Filed: December 3, 2013
    Date of Patent: October 9, 2018
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Bengt Lindoff, Gabor Fodor, Muhammad Kazmi, Stefan Parkvall
  • Patent number: 9938823
    Abstract: An apparatus includes a circuit to receive power and data over a communication medium, where the circuit is to separate the power and the data. An electronic switch couples the power output by the circuit to a downhole electrical component for use in a well. According to other implementations, an electro-hydraulic actuator includes an outer housing defining a first hydraulic chamber and a second hydraulic chamber, where a seal for one of the hydraulic chambers is achieved without use of an elastomeric seal.
    Type: Grant
    Filed: February 15, 2012
    Date of Patent: April 10, 2018
    Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventors: Benoit Deville, Marian Faur, Charley Martinez
  • Patent number: 9721128
    Abstract: A radio tag capable of indicating to a reader, via a wireless link, that a variation in energy has crossed a predetermined threshold, this variation in energy being chosen from the group made up of a variation in the temperature of the radio tag and a variation in the magnetic field in which the radio tag is immersed. This radio tag includes transducer material chosen from a group made up of a thermal shape-memory material, a magnetostrictive material and a magnetic shape-memory material. This transducer material is deposited and affixed without any degree of freedom onto a substrate or an antenna of the radio tag to form, with the substrate or the antenna, a multilayer structure which flexurally deforms the antenna between a bent conformation and a less bent conformation when the energy variation crosses the predetermined threshold.
    Type: Grant
    Filed: December 9, 2015
    Date of Patent: August 1, 2017
    Assignee: Commissariat à l'énergie atomique et aux énergies alternatives
    Inventors: Juvenal Alarcon Ramos, Bernard Viala
  • Patent number: 9634694
    Abstract: The present disclosure is directed to a system and method for performing digital up-conversion of a signal to a desired RF carrier frequency. The system and method efficiently perform digital up-conversion of the signal, in one example, by controlling a sample clock that is used by a DAC to sample and convert the up-converted signal from the digital domain to the analog domain to have a frequency that is four or eight times the desired RF carrier frequency. By controlling the sample clock of the DAC to have a frequency that is four or eight times the desired RF carrier frequency, the system and method can be implemented using currently available IC process geometries such that the implementation consumes much less area and/or power than an analog up-converter configured to have equivalent up-conversion functionality.
    Type: Grant
    Filed: January 24, 2014
    Date of Patent: April 25, 2017
    Assignee: Avago Technologies General IP (Singapore) Pte. Ltd.
    Inventors: David Money Harris, David Garrett, Bob Lorenz
  • Patent number: 9612266
    Abstract: A capacity measuring circuit includes a measuring voltage source configured to feed a sinusoidal voltage signal to a first terminal of a capacity to be measured so as to cause a temporal change in a charge stored on the capacity to be measured. The capacity measuring circuit additionally includes a delta-sigma modulator. The delta-sigma modulator is configured to receive a charge from a second terminal of the capacity to be measured and to provide a digital output signal which is dependent on a quantity of the charge received from the capacity to be measured. The capacity measuring circuit may be employed in a sensor system.
    Type: Grant
    Filed: February 8, 2013
    Date of Patent: April 4, 2017
    Assignee: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
    Inventors: Stefan Moedl, Johann Hauer, Josef Sauerer
  • Patent number: 9553473
    Abstract: A transmitter assembly is useful in optimizing in the delivery of wireless power to a plurality of receivers. Each receiver measures its own battery need for power and transmits that measurement as a request to the transmitter. The transmitter is configured to normalize and compare battery need requests. The transmitter then allocates pulses of wireless power among the requesting receivers according to their battery need.
    Type: Grant
    Filed: February 3, 2014
    Date of Patent: January 24, 2017
    Assignee: Ossia Inc.
    Inventors: Hatem Zeine, Thomas H. Wilson, K. Kenneth Clark
  • Patent number: 8963635
    Abstract: An apparatus for coding a signal by means of amplitude shift keying comprises a class E amplifier including a switching transistor, to whose gate is supplied a voltage having an operating frequency for operating the class E amplifier. For achieving an amplitude shift keying in the output signal of the class E amplifier, a circuit for switching the operating frequency of the voltage supplied to the gate of the switching transistor, or the resonance frequency of the class E amplifier, between a first value and a second value is provided and in order to switch a deviation degree between the operating frequency and the resonance frequency between a first value and a second value.
    Type: Grant
    Filed: April 24, 2008
    Date of Patent: February 24, 2015
    Assignee: Endress + Hauser Conducta Gesellschaft fur Mess—und Regeltechnik mbH + Co. KG
    Inventor: Sven-Matthias Scheibe
  • Patent number: 8952765
    Abstract: A radio frequency generator includes a power control module, a frequency control module and a pulse generating module. The power control module is configured to generate a power signal indicating power levels for target states of a power amplifier. The frequency control module is configured to generate a frequency signal indicating frequencies for the target states of the power amplifier. The pulse generating module is configured to (i) supply an output signal to the power amplifier, (ii) recall at least one of a latest power level or a latest frequency for one of the target states of the power amplifier, and (iii) adjust a current power level and a current frequency of the output signal from a first state to a second state based on the power signal, the frequency signal, and at least one of the latest power level and the latest frequency of the power amplifier.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: February 10, 2015
    Assignee: MKS Instruments, Inc.
    Inventors: Larry J. Fisk, II, Amish Rughoonundon
  • 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
  • Publication number: 20140320226
    Abstract: According to one embodiment, a synthesizer for a transmitter includes a transformer, a plurality of core support units and a fixing member. The plurality of core support units includes a support plate, fixing unit and an insertion. The support plate supports a toroidal core around which the primary winding is wound. The fixing unit fixes the toroidal core to the support plate. The insertion portion is formed inside or around the toroidal core and into which the secondary winding is inserted. The fixing member includes a plurality of receiving portions to and from which the plurality of core support units are attached and detached. The plurality of receiving portions are formed along a direction in which the plurality of core support units are stacked.
    Type: Application
    Filed: March 4, 2014
    Publication date: October 30, 2014
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yoshihiko TAKAHASHI, Yuuki FUNAHASHI
  • Patent number: 8866559
    Abstract: A parametric audio system that permits greater control over the bandwidth of a modulated signal. The system includes a carrier signal generator for generating a carrier signal, at least one audio signal source for generating at least one audio signal, and a modulation component for generating an envelope signal based on the at least one audio signal, modulating the phase of the carrier signal based on a predetermined function to generate a first modulated signal, and multiplying the envelope signal and the first modulated signal to generate a second modulated signal. By selection of the predetermined function, the modulation component can alter the spectrum of the second modulated signal, thereby permitting greater control over the bandwidth of the second modulated signal.
    Type: Grant
    Filed: March 16, 2011
    Date of Patent: October 21, 2014
    Inventor: Frank Joseph Pompei
  • Patent number: 8860524
    Abstract: A polar modulator of the present invention includes: a first function block which generates an amplitude signal and a phase signal; a second function block which adjusts the signal delay between the amplitude signal and the phase signal; a third function block which allows the low frequency component of the amplitude signal to pass therethrough; a fourth function block which modulates the phase of the phase signal; a fifth function block which outputs a modulation voltage, based on the amplitude signal; a sixth function block which modulates the amplitude of the phase signal, based on the modulation voltage; a seventh function block which measures the temperature of at least one function block; and an eighth function block which calculates a compensation amount for the signal delay, based on the measured temperature. The second function block adjusts the signal delay, based on the compensation amount.
    Type: Grant
    Filed: June 17, 2010
    Date of Patent: October 14, 2014
    Assignee: Panasonic Corporation
    Inventors: Shigeru Morimoto, Kaoru Ishida, Maki Nakamura
  • Patent number: 8797112
    Abstract: An ASK modulator includes a baseband unit which obtains a sequence comprising at least one amplitude value and adds an additional value to each of the at least one amplitude value to generate a modified sequence; a digital-to-analog converter coupled to the baseband unit, the digital-to-analog converter converts the modified sequence to generate a first signal, the additional value is determined based on a half scale of the digital-analog converter; and a mixer which receives the first signal and a second signal and generate a modulated signal by mixing the first signal with the second signal.
    Type: Grant
    Filed: February 20, 2012
    Date of Patent: August 5, 2014
    Assignee: Beken Corporation
    Inventors: Peng Han, Dawei Guo Guo, Jiazhou Liu, Yanfeng Wang
  • Patent number: 8797113
    Abstract: A power amplifier comprises: polar modulator that receives modulated signal including amplitude-modulated component and phase-modulated component, outputs the amplitude-modulated component, superimposes the modulated signal on carrier wave to generate signal output as RF-modulated signal, and delays at least one of the amplitude-modulated component and the RF-modulated signal; first amplitude modulator that receives the amplitude-modulated component, pulse-modulates the amplitude-modulated component to generate signal output as pulse-modulated signal, and amplifies the amplitude-modulated component with the amplitude-modulated component and the pulse-modulated signal as control signals; second amplitude modulator that receives the amplitude-modulated component and the pulse-modulated signal, and amplifies the amplitude-modulated component with the amplitude-modulated component and the pulse-modulated signal as control signals; and first RF amplifier that receives the RF-modulated signal, amplifies the RF-modu
    Type: Grant
    Filed: September 30, 2010
    Date of Patent: August 5, 2014
    Assignee: NEC Corporation
    Inventor: Shingo Yamanouchi
  • 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
  • Patent number: 8737516
    Abstract: A method and system is provided for communicating distinct data over a single frequency using on-off keying, a form of amplitude modulation, or phase changes timed to the zero crossing point of the carrier. A data signal is synchronized with the carrier by adding padding bits so that the number of bits is equal to the frequency of the carrier. The carrier is then modified by attenuating the carrier as needed once per cycle. Said carrier is then transmitted. The resulting transmitted carrier carries a number of bits equal to the transmit frequency. At the receive end, the received signal is compared to a sine wave to determine if the incoming signal is at full strength or at reduced strength, allowing for the detection of encoded digital information. In a another embodiment, the phase of the carrier is changed instead of attenuating the carrier, timed to the carrier cycles, once or twice per cycle.
    Type: Grant
    Filed: September 21, 2011
    Date of Patent: May 27, 2014
    Inventor: Nigel Iain Stuart Macrae
  • 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: 8704607
    Abstract: The pulse modulated RF power control method includes an output amplitude control step for controlling amplitude of a pulse output, and a duty control step for controlling a duty ratio of the pulse output. The output amplitude control step performs a constant amplitude control to control an amplitude value of the pulse output so that the amplitude value becomes equal to a set amplitude value. The constant amplitude control according to the output amplitude control, for instance, gives a feedback of the amplitude value of the pulse output outputted by the power control, obtains a difference value between the feedback value and the set amplitude value, and controls the amplitude value of the pulse output so that the difference value becomes zero.
    Type: Grant
    Filed: May 17, 2010
    Date of Patent: April 22, 2014
    Assignee: Kyosan Electric Mfg. Co., Ltd.
    Inventors: Itsuo Yuzurihara, Yoshihisa Hata
  • Patent number: 8665035
    Abstract: Systems and methods for generating pulsed output signals that employ a gated RF oscillator circuit having an output that is switchably grounded through the emitter of a transistor and including feedback from the output of the circuit to the base of the transistor to create oscillations and to allow a digital input pulse of a desired length to control the start and stop of oscillations created by the transistor.
    Type: Grant
    Filed: May 1, 2009
    Date of Patent: March 4, 2014
    Assignee: L-3 Communications Integrated Systems LP
    Inventors: Ross A. McClain, Jr., Brian C. Rutherford
  • Patent number: 8653902
    Abstract: Provided is a transmission circuit that operates highly efficiently by avoiding deterioration of the linearity of an output signal and suppressing occurrence of distortion of the output signal, when using the envelope tracking method. In this transmission circuit, offset control section (160) sets voltage that makes the corrected envelope signal level equal to or higher than the delayed envelope signal level, as offset voltage. By this means, the corrected envelope signal level becomes equal to or higher than the delayed envelope signal level, so that it is possible to prevent the power supply voltage from being lower than the optimal power supply voltage, making it possible to prevent the linearity of an output signal from deteriorating in power amplifier (130).
    Type: Grant
    Filed: May 12, 2011
    Date of Patent: February 18, 2014
    Assignee: Panasonic Corporation
    Inventor: Ryo Kitamura
  • Patent number: 8629760
    Abstract: A signal conversion device, a radio frequency identification (RFID) tag, and a method for operating the RFID tag. The RFID tag has an electrically erasable programmable read-only memory module for storing RFID tag information and transmitting the RFID tag information; an information comparison module coupled to the electrically erasable programmable for receiving the RFID tag information and demodulation information, comparing the RFID tag information with the demodulation information, and generating a driving signal; and a pulse oscillation module coupled to the information comparison module for receiving the driving signal, and transmitting pulse oscillating signals to the electrically erasable programmable read-only memory module, so as to allow the electrically erasable programmable read-only memory module to transmit the RFID tag information.
    Type: Grant
    Filed: December 30, 2008
    Date of Patent: January 14, 2014
    Assignee: National Taiwan University
    Inventors: Chi-En Liu, Jean-Fu Kiang
  • Patent number: 8563930
    Abstract: A system and method for producing modulated electrical signals. The system uses a variable resistor having a photoconductive wide bandgap semiconductor material construction whose conduction response to changes in amplitude of incident radiation is substantially linear throughout a non-saturation region to enable operation in non-avalanche mode. The system also includes a modulated radiation source, such as a modulated laser, for producing amplitude-modulated radiation with which to direct upon the variable resistor and modulate its conduction response. A voltage source and an output port, are both operably connected to the variable resistor so that an electrical signal may be produced at the output port by way of the variable resistor, either generated by activation of the variable resistor or propagating through the variable resistor. In this manner, the electrical signal is modulated by the variable resistor so as to have a waveform substantially similar to the amplitude-modulated radiation.
    Type: Grant
    Filed: April 17, 2009
    Date of Patent: October 22, 2013
    Assignee: Lawrence Livermore National Security, LLC
    Inventors: John Richardson Harris, George J. Caporaso, Stephen E. Sampayan
  • Publication number: 20130243120
    Abstract: A modulator which has a first terminal to receive a carrier signal, a second terminal to receive a first control signal to control a frequency band of the carrier signal and a third terminal to receive a second control signal to control a modulation depth of the carrier signal.
    Type: Application
    Filed: March 16, 2012
    Publication date: September 19, 2013
    Applicant: FAVEPC INC.
    Inventors: Chun-Liang Tsai, Shao-Chang Chang
  • Patent number: 8476985
    Abstract: In order to generate a broadband, frequency-modulated output signal, of which the carrier frequency is adjustable within a wide frequency range, a frequency-modulated signal is generated on an arbitrary, fixed carrier frequency, which is then converted into IQ signals, and the IQ signals generated in this manner are combined with the desired carrier frequency by IQ modulation to form the frequency-modulated output signal. By preference, the generated IQ signals are low-pass filtered before the IQ modulation.
    Type: Grant
    Filed: June 10, 2008
    Date of Patent: July 2, 2013
    Assignee: Rohde & Schwarz GmbH & Co. KG
    Inventors: Norbert Richt, Petr Lorenz
  • Publication number: 20130162363
    Abstract: An ASK modulator includes a baseband unit which obtains a sequence comprising at least one amplitude value and adds an additional value to each of the at least one amplitude value to generate a modified sequence; a digital-to-analog converter coupled to the baseband unit, the digital-to-analog converter converts the modified sequence to generate a first signal, the additional value is determined based on a half scale of the digital-analog converter; and a mixer which receives the first signal and a second signal and generate a modulated signal by mixing the first signal with the second signal.
    Type: Application
    Filed: February 20, 2012
    Publication date: June 27, 2013
    Inventors: Peng Han, Dawei Guo, Jiazhou Liu, Yanfeng Wang
  • Patent number: 8457567
    Abstract: Apparatus for generating a modulation signal for use in modulating the power supply of a power amplifier uses coarse and fine control for controlling the amplitude of the modulation signal, and thereby controlling the output power of the power amplifier. The modulation signal may be generated in the digital domain and converted to the analog domain by a digital-to-analog converter, with the digital-to-analog converter providing the fine control and a variable gain amplifier providing the coarse control of the analog signal.
    Type: Grant
    Filed: May 21, 2010
    Date of Patent: June 4, 2013
    Assignee: ST-Ericsson SA
    Inventor: Roland Ryter
  • Patent number: 8358719
    Abstract: A method and device for the simultaneous compensation of several signal errors that occur in an IQ-modulator, using respective inverse correction signals, wherein the optimized signal magnitude of each correction signal is calculated by the determination of the effective signal error and by the subsequent iterative minimization of the effective signal error.
    Type: Grant
    Filed: May 6, 2005
    Date of Patent: January 22, 2013
    Assignee: Rohde & Schwarz GmbH & Co. KG
    Inventor: Joachim Danz
  • Patent number: 8319569
    Abstract: A quadrature amplitude modulator is provided. An oscillator generates an in-phase carrier signal having a rectangular wave, a trapezoidal wave or a waveform similar to these, and a quadrature carrier signal, the phase of which is shifted by ¼ cycle relative to the in-phase carrier signal. A multi-level driver generates an in-phase modulated signal by amplitude modulating the in-phase carrier signal with an analog in-phase baseband signal having a discrete voltage level or current level in accordance with the in-phase baseband data. Likewise, the multi-level driver generates a quadrature modulated signal by amplitude modulating the quadrature carrier signal with an analog quadrature baseband signal having a discrete voltage level or current level in accordance with the quadrature baseband data The multi-level driver generates a modulated signal, the amplitude of which takes a discrete level, by combining the modulated signals together.
    Type: Grant
    Filed: October 7, 2008
    Date of Patent: November 27, 2012
    Assignee: Advantest Corporation
    Inventor: Shoji Kojima
  • Patent number: 8269571
    Abstract: An amplitude modulated pulse transmitter designed to operate across a multi MHz range of modulation frequencies. A wire wound rare earth magnet is to be utilized instead of the typical modulation transformer. Additionally, a plurality of electrolytic capacitors are also employed in the transmitter.
    Type: Grant
    Filed: June 12, 2009
    Date of Patent: September 18, 2012
    Inventor: James E. Bare
  • Patent number: 8269569
    Abstract: A test apparatus includes digital modulators provided in increments of multiple channels. A baseband signal generator performs retiming of data input as a modulation signal for the in-phase (quadrature) component, using a timing signal the timing of which can be adjusted, thereby generating a baseband signal. A driver generates a multi-value digital signal having a level that corresponds to the baseband signal output from the baseband signal generator. A multiplier amplitude-modulates a carrier signal with the multi-value digital signal. An adder sums the output signals of the multipliers.
    Type: Grant
    Filed: February 20, 2009
    Date of Patent: September 18, 2012
    Assignee: Advantest Corporation
    Inventors: Daisuke Watanabe, Toshiyuki Okayasu
  • Patent number: 8174310
    Abstract: A quadrature demodulation circuit includes: first to fourth mixers to receive a modulation signal; a phase shifter to supply to the first and third mixers a first local frequency signal, to supply to the second mixer a second local frequency signal having a designated phase difference relative to the first local frequency signal, and to supply to the fourth mixer a third local frequency signal that is an inverse in phase to the second local frequency signal; a first adder to add a signal output from the first mixer and a signal output from the second mixer and to output a first demodulation signal; and a second adder to add a signal output from the third mixer and a signal output from the fourth mixer and to output a second demodulation signal.
    Type: Grant
    Filed: August 23, 2010
    Date of Patent: May 8, 2012
    Assignee: Fujitsu Semiconductor Limited
    Inventors: Shingo Sakamoto, Kotaro Murakami
  • Patent number: 8130049
    Abstract: Generation of Terahertz range (300 GHz to 3 THz) frequencies is increasingly important for communication, imaging and spectroscopic systems, including concealed object detection. Apparatus and methods describe generating multiple phase signals which are phase-locked at a fundamental frequency, which are then interleaved into an output which is a multiple of the fundamental frequency. By way of example phase generators comprise cross-coupling transistors (e.g., NMOS) and twist coupling transistors (NMOS) for generating a desired number of phase-locked output phases. A rectifying interleaver comprising a transconductance stage and Class B amplifiers provides superimposition of the phases into an output signal. The invention allows frequency output to exceed the maximum frequency of oscillation of a given device technology, such as CMOS in which a 324 GHz VCO in 90 nm digital CMOS with 4 GHz tuning was realized.
    Type: Grant
    Filed: October 15, 2009
    Date of Patent: March 6, 2012
    Assignee: The Regents of the University of California
    Inventors: Daquan Huang, Mau-Chung Frank Chang, Tim R. LaRocca
  • Patent number: 8078123
    Abstract: A radio frequency (RF) transmission correction module includes an RF transmission error detection module and a correction module. The error detection module includes an RF envelope detector, a signal conversion module, and an error detection module. The RF envelope detector is operably coupled to produce an envelope signal from a transmit RF signal, wherein the envelope signal represents at least one of local oscillation leakage and in-phase (I) and quadrature (Q) imbalance. The signal conversion module is operably coupled to convert the envelope signal into an error signal in accordance with baseband processing of the transmit RF signal. The error detection module is operably coupled to determine at least one of a local oscillation leakage value and an I and Q imbalance value from the error signal.
    Type: Grant
    Filed: July 13, 2005
    Date of Patent: December 13, 2011
    Assignee: Broadcom Corporation
    Inventors: Arya Reza Behzad, Adedayo Ojo, C. Paul Lee
  • Publication number: 20110280334
    Abstract: The present invention provides a digital amplitude modulator and polar transmitter using the same. The polar transmitter includes: a polar converter for converting an input signal into an amplitude information signal and a phase information signal, and outputting the converted amplitude and phase information signal; a sigma-delta modulator for receiving a fractional part of the amplitude information signal, and generating a correcting value for an integer part of the amplitude information signal; a phase-modulator for upward-modulating the phase information signal outputted from the polar converter, and outputting carrier waves including the upward-modulated phase information signal; and a digital power amplifier for generating an output signal whose amplitude corresponds to the integer part of the amplitude information signal which is subjected to correction by the correcting value, and outputting combining the output signal with an output value of the phase-modulator to output the combined signal.
    Type: Application
    Filed: August 20, 2010
    Publication date: November 17, 2011
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventors: Joon Hyung Lim, Han Jin Cho, Yong Il Kwon, Kyung Hee Hong, Koon Shik Cho, Myeung Su Kim
  • Patent number: 8050352
    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. In other embodiments the peak-to-RMS amplitude ratio reducing methods and apparatus used to process PAM signal are adapted for reducing peak-to-RMS amplitude ratios of amplitude modulation signals in polar modulation transmitters. Peak-to-RMS amplitude ratio reduction is performed in the quadrature domain, the polar domain, or both the quadrature and polar domains.
    Type: Grant
    Filed: July 14, 2008
    Date of Patent: November 1, 2011
    Assignee: Panasonic Corporation
    Inventors: Stephan V. Schell, Richard W. D. Booth
  • Patent number: 8036308
    Abstract: Certain aspects of a method and system for a wideband polar transmitter may be disclosed. Aspects of the method may include polar modulating a plurality of signals by generating a plurality of modulated intermediate frequency (IF) signals corresponding to each of a plurality of wireless communication protocols within a transmitter that handles the plurality of wireless communication protocols. The generated plurality of modulated IF signals may be upconverted to a plurality of radio frequency (RF) signals. The plurality of RF signals may be combined and the combined plurality of RF signals may be amplitude modulated.
    Type: Grant
    Filed: February 28, 2007
    Date of Patent: October 11, 2011
    Assignee: Broadcom Corporation
    Inventor: Ahmadreza Rofougaran
  • Patent number: 8004368
    Abstract: A digital amplitude modulator. The digital amplitude modulator is configured to modulate the amplitude of an input carrier signal based on input digital data and generate a corresponding output signal. The digital amplitude modulator includes a first variable gain amplifier for receiving the input carrier signal and generating a corresponding first amplified carrier signal, a second variable gain amplifier for receiving the input digital data and generating corresponding digital amplitude control data and a plurality of selectively activatable amplifier stages. Each amplifier stage receives a replica of the first amplified carrier signal and generates a corresponding second amplified carrier signal when activated. The output signal corresponds to a combination of the second amplified carrier signals generated by the activated amplifier stages.
    Type: Grant
    Filed: September 15, 2009
    Date of Patent: August 23, 2011
    Assignee: STMicroelectronics, S.r.l.
    Inventors: Calogero Davide Presti, Francesco Carrara, Antonino Scuderi, Guiseppe Palmisano
  • Publication number: 20110183636
    Abstract: A circuit including a carrier amplifier having an input, an output, a first transistor coupled to a first power supply voltage terminal for receiving a modulated power supply voltage, and a second transistor coupled to a second power supply voltage terminal for receiving a fixed power supply voltage is provided. The circuit further includes a peaking amplifier having an input coupled to the input of the carrier amplifier and an output coupled to the output of the carrier amplifier.
    Type: Application
    Filed: January 22, 2010
    Publication date: July 28, 2011
    Inventors: Joseph Staudinger, John M. Pigott, Eric J. Toulouse
  • Publication number: 20110121911
    Abstract: A modulation circuit includes a load and a transistor serving as a switch. The transistor has an oxide semiconductor layer in which hydrogen concentration is 5×1019/cm3 or less. The off-state current of the transistor is 1×10?13 A or less. A modulation circuit includes a load, a transistor serving as a switch, and a diode. The load, the transistor, and the diode are connected in series between the terminals of an antenna. The transistor has an oxide semiconductor layer in which hydrogen concentration is 5×1019/cm3 or less. An off-state current of the transistor is 1×10?13 A or less. On/off of the transistor is controlled in accordance with a signal inputted to a gate of the transistor. The load is a resistor, a capacitor, or a combination of a resistor and a capacitor.
    Type: Application
    Filed: November 17, 2010
    Publication date: May 26, 2011
    Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
    Inventor: Koichiro KAMATA
  • Patent number: 7932791
    Abstract: A signal modulation device and a signal amplifier cooperative therewith. The signal modulation device includes a local oscillation signal source, a baseband signal source, a first NMOS transistor, and a second NMOS transistor, wherein the first and second NMOS transistors are coupled with the baseband signal source and form a circuit architecture of a Gilbert-cell based differential pair to be directly switched by a differential baseband signal, and a high-frequency signal from the local oscillation signal source is controlled by the baseband signal so as to generate an amplitude-modulation high-frequency signal at an output end. The single-stage signal power amplifier amplifies the amplitude-modulation signal from the preceding circuit so as to increase the magnitude of signals transmitted and simplify the preceding digital/analog signal conversion circuit in a conventional amplitude-modulation circuit.
    Type: Grant
    Filed: December 30, 2008
    Date of Patent: April 26, 2011
    Assignee: National Taiwan University
    Inventors: Chi-En Liu, Jean-Fu Kiang
  • Publication number: 20110074518
    Abstract: A quadrature amplitude modulator is provided. An oscillator generates an in-phase carrier signal having a rectangular wave, a trapezoidal wave or a waveform similar to these, and a quadrature carrier signal, the phase of which is shifted by ¼ cycle relative to the in-phase carrier signal. A multi-level driver generates an in-phase modulated signal by amplitude modulating the in-phase carrier signal with an analog in-phase baseband signal having a discrete voltage level or current level in accordance with the in-phase baseband data. Likewise, the multi-level driver generates a quadrature modulated signal by amplitude modulating the quadrature carrier signal with an analog quadrature baseband signal having a discrete voltage level or current level in accordance with the quadrature baseband data The multi-level driver generates a modulated signal, the amplitude of which takes a discrete level, by combining the modulated signals together.
    Type: Application
    Filed: October 7, 2008
    Publication date: March 31, 2011
    Applicant: ADVANTEST CORPORATION
    Inventor: Shoji Kojima
  • Patent number: 7907731
    Abstract: A data communication system that enhances concealment by significantly increasing the time required for a wiretapper to decrypt a cipher text. The data communication system is constituted by connecting a data transmitting apparatus (13105) to a data receiving apparatus (11201) via a transmission path (110). In the data transmitting apparatus (13105), a multilevel encoding part (111) receives a predetermined first initial value (key information) and information data and generates a multilevel signal that varies in level substantially in a random number manner. A dummy signal superimposing part (118) superimposes a dummy signal on the multilevel signal. A modulating part (112) converts the multilevel signal to a modulated signal of a predetermined modulation form and transmits the modulated signal.
    Type: Grant
    Filed: October 5, 2005
    Date of Patent: March 15, 2011
    Assignee: Panasonic Corporation
    Inventors: Masaru Fuse, Satoshi Furusawa, Tsuyoshi Ikushima, Toru Shiozaki
  • Patent number: 7907029
    Abstract: A modulator includes a first converter, a second converter and a mixer. The first converter is configured to receive a first bit and provide a first current that is a function of the first bit. The second converter is configured to receive a second bit and provide a second current that is a function of the second bit. The mixer is configured to receive an input current that is a sum of the first current and the second current and a frequency signal and provide an output signal that is a function of the input current and the frequency signal.
    Type: Grant
    Filed: March 11, 2008
    Date of Patent: March 15, 2011
    Assignee: Intel Mobile Communications Technology GmbH
    Inventor: Christoph Schwoerer
  • Patent number: 7898351
    Abstract: There is provided a modulation circuit including a sampling unit that over-samples an input digital signal based on a multiplying clock signal, and outputs a first over-sampling signal, a first frequency conversion unit that outputs a first high-frequency signal based on the first over-sampling signal and a reference signal, a first filter unit that outputs a second high-frequency signal based on a second over-sampling signal obtained by delaying the first over-sampling signal by one clock and the reference signal, a second filter unit that outputs a third high-frequency signal based on a third over-sampling signal obtained by delaying the second over-sampling signal by one clock and the reference signal, and an adder unit that adds the first high-frequency signal, the second high-frequency signal, and the third high-frequency signal, and outputs an output signal.
    Type: Grant
    Filed: June 23, 2009
    Date of Patent: March 1, 2011
    Assignee: Sony Corporation
    Inventor: Koichi Ito
  • Patent number: 7888984
    Abstract: There is provided a small-size, low-power-consumption intermittent operation circuit capable of obtaining an output waveform having a rapid rise and fall. The intermittent operation circuit includes an active circuit (106), a first control signal generation circuit (101) for generating a first control signal (S1) for controlling the operation start and the operation end of the active circuit (106), a second control signal generation circuit (102) for generating a second control signal (S2) causing the active circuit (106) to perform ringing vibration and controlling the frequency and the amplitude value of the ringing vibration, and a timing adjusting circuit (103) for adjusting the input timing of the first and the second control signal (S1, S2) into the active circuit (106) so that the ringing vibration and the safety vibration are outputted continuously from the active circuit (106).
    Type: Grant
    Filed: August 23, 2006
    Date of Patent: February 15, 2011
    Assignee: Panasonic Corporation
    Inventors: Shigeru Kobayashi, Suguru Fujita
  • Patent number: 7884681
    Abstract: Embodiments of the present invention include amplitude-modulated or polar-modulated radio frequency (RF) power amplifier circuitry, in which an envelope power supply input to an RF power amplifier is powered by a pre-distorted amplitude modulation (AM) power supply. The pre-distorted AM power supply receives an AM signal, which is then pre-distorted and amplified to provide an AM power supply signal to the RF power amplifier. The pre-distortion of the AM signal is used to improve the linearity, the efficiency, or both, of the RF power amplifier. The pre-distortion provides a feed-forward system, which may allow use of a reduced bandwidth pre-distorted AM signal to an AM power supply and a reduced bandwidth AM power supply, which may increase efficiency.
    Type: Grant
    Filed: April 30, 2008
    Date of Patent: February 8, 2011
    Assignee: RF Micro Devices, Inc.
    Inventors: Nadim Khlat, Ruediger Bauder, David Reed, Baker P. Scott
  • Publication number: 20100327988
    Abstract: Signal modulation apparatus for applying a modulation signal to a carrier signal, the apparatus comprising: an amplitude modulator for modulating the amplitude of the carrier signal in accordance with a control signal; first mixing means for mixing together fractions of the carrier signal before and after action of the amplitude modulator to produce a first detection signal indicative of the amplitude modulation applied by the amplitude modulator; and detection means for comparing the control signal with a first detection signal to evaluate distortion in the first detection signal as compared with the control signal.
    Type: Application
    Filed: February 26, 2009
    Publication date: December 30, 2010
    Applicant: CAMBRIDGE SILICON RADIO LIMITED
    Inventor: Per-Olof Brandt
  • Publication number: 20100321127
    Abstract: A test apparatus includes digital modulators provided in increments of multiple channels. A baseband signal generator performs retiming of data input as a modulation signal for the in-phase (quadrature) component, using a timing signal the timing of which can be adjusted, thereby generating a baseband signal. A driver generates a multi-value digital signal having a level that corresponds to the baseband signal output from the baseband signal generator. A multiplier amplitude-modulates a carrier signal with the multi-value digital signal. An adder sums the output signals of the multipliers.
    Type: Application
    Filed: February 20, 2009
    Publication date: December 23, 2010
    Applicant: ADVANTEST CORPORATION
    Inventors: Daisuke Watanabe, Toshiyuki Okayasu
  • Publication number: 20100301961
    Abstract: A phase locked loop comprising: an oscillator for generating an output signal of a frequency that is dependent on an input to the oscillator; sampling means for generating a sequence of digital values representing the output of the oscillator at moments synchronised with a reference frequency; a difference unit for generating a feedback signal representing the difference between successive values in the sequence; and an integrator for integrating the difference between the feedback signal and a signal of a desired output frequency; the signal input to the oscillator being dependent on the output of the integrator.
    Type: Application
    Filed: August 19, 2008
    Publication date: December 2, 2010
    Applicant: CAMBRIDGE SILICON RADIO LIMITED
    Inventors: Michael Story, Nicolas Sornin