Plural Modulation Patents (Class 332/108)
  • Patent number: 10115352
    Abstract: The present disclosure provides a backlight driving circuit, which includes a backlight source, an image collecting circuit, a comparing circuit, a PWM generating circuit, a PFM generating circuit, a driving circuit and a backlight driving circuit, the image collecting circuit outputs a grayscale value of a current frame to the driving circuit; the driving circuit transmits a grayscale variation value to the comparing circuit; the comparing circuit outputs a control signal for the PWM generating circuit or a control signal for the PFM generating circuit; the PWM generating circuit generates a PWM signal or the PFM generating circuit generates a PFM signal and outputs it to the backlight driving circuit; the backlight driving circuit changes a current of the backlight source for dimming. This circuit may decrease the whole energy loss of the backlight adjusting process and increase the working efficiency of the circuit.
    Type: Grant
    Filed: December 30, 2015
    Date of Patent: October 30, 2018
    Assignee: Wuhan China Star Optoelectronics Technology Co., Ltd
    Inventors: Zhenzhou Xing, Qingcheng Zuo
  • Patent number: 9925888
    Abstract: A vehicle includes a traction battery and a controller. The controller is programmed to detect a voltage measurement error associated with a battery cell. The controller is also programmed to, in response to detecting a voltage measurement error for a battery cell, initialize a state of charge of the battery cell according to an average change in stored capacity between power cycles.
    Type: Grant
    Filed: March 2, 2016
    Date of Patent: March 27, 2018
    Assignee: Ford Global Technologies, LLC
    Inventors: Xiaoguang Chang, Xu Wang, Chuan He
  • Patent number: 9076624
    Abstract: A method for operating a device having an anode and a cathode for generating microwave radiation with an accelerating voltage is provided. A chronological sequence of the accelerating voltage is provided by a series of voltage pulses. A first voltage pulse with an operating amplitude is applied between the anode and the cathode in order to determine whether an electric flashover occurs during the applied first voltage pulse. A second voltage pulse is applied following the first voltage pulse with a deionization amplitude that is smaller than the operating amplitude when the electric flashover occurs during the applied first voltage pulse.
    Type: Grant
    Filed: May 10, 2013
    Date of Patent: July 7, 2015
    Assignee: Siemens Aktiengsellschaft
    Inventor: Oliver Heuermann
  • 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
  • Publication number: 20140191817
    Abstract: A PWM signal generating circuit, printer, and PWM signal generating method are described. The PWM signal generating circuit includes: a single counter configured to count values expressed in N bits; and at least one arithmetic device configured to generate a PWM signal, each of the at least one arithmetic device including a pulse width data storage unit for storing N-bit pulse width data representing a pulse width of the PWM signal to be generated, and an adder for calculating a carry value from a most significant bit obtained when adding the count value and the pulse width data. A signal having a level corresponding to the carry value is output at every change in the count value so that the PWM signal having the pulse width of the pulse width data is generated.
    Type: Application
    Filed: December 27, 2013
    Publication date: July 10, 2014
    Applicant: RICOH COMPANY, LTD.
    Inventors: Takashi MICHIYOSHI, Tetsuro TATEBE
  • 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
  • Publication number: 20130285758
    Abstract: An apparatus is disclosed. The apparatus includes a circuit configured to transmit a signal as a serial protocol over a pair of electrical conductors. The serial protocol is defined as a series of pulses distributed over at least one transmission frame. At least one pulse in the transmission frame is simultaneously encoded by modulating an amplitude of the pulse to represent one of two first logic states and modulating a width of the pulse to represent one of two second logic states. An instrument and a generator also are disclosed.
    Type: Application
    Filed: March 15, 2013
    Publication date: October 31, 2013
    Inventors: Jeffrey L. Aldridge, John K. Moriarty, Stephen T Janesch, Matthew R. Drzewiecki, Ryan J. Thompson
  • Patent number: 8553801
    Abstract: A device is provided for use with an input signal including a first packet of a first modulation type in series with a second packet of a second modulation type. The device includes a gain adjustment portion and a gain portion. The gain adjustment portion can output a first gain adjustment signal based on the first packet or can output a second gain adjustment signal based on the second packet. The gain portion can output a first signal corresponding to the first packet and can output a second signal corresponding to the second packet. The first signal is based on the input signal and a first gain factor. The second signal is based on the input signal and a second gain factor. The first gain factor is based on the first gain adjustment signal. The second gain factor is based on the second gain adjustment signal.
    Type: Grant
    Filed: September 29, 2010
    Date of Patent: October 8, 2013
    Assignee: Hughes Network Systems, LLC
    Inventors: Yogesh Sethi, Roderick Ragland, Dave Roos, Levent Ozturk, Doug Ricker, Habib Estephan
  • Patent number: 8526530
    Abstract: A method and apparatus for encoding feedback signal is provided. The method includes: encoding feedback signals of three carriers to output a bit sequence; and transmitting the bit sequence on a High Speed-Dedicated Physical Control Channel (HS-DPCCH). The encoding the feedback signals of the three carriers may specifically include: mapping the feedback signals of the three carriers into a codeword, in which the codeword can be selected from a codebook, and codewords in the codebook satisfy a particular code distance relationship. The method for jointly encoding feedback signals of three carriers in a Ternary Cell (TC) mode is provided. Feedback signals are transmitted over a single code channel. Therefore, power overhead is reduced, and system performance is improved.
    Type: Grant
    Filed: September 16, 2011
    Date of Patent: September 3, 2013
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Shuju Fan, Jing Li, Xueli Ma, Zongjie Wang
  • Patent number: 8509329
    Abstract: Disclosed are a data receiving apparatus that may discriminate a type of a received data frame, and a data transmission apparatus that may apply a constellation mapping scheme to a data frame so that a data receiving apparatus may discriminate the data frame in accordance with the constellation mapping scheme applied to the data frame.
    Type: Grant
    Filed: September 29, 2010
    Date of Patent: August 13, 2013
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Ui Kun Kwon, Tae Rim Park, Young Soo Kim, Eung Sun Kim
  • Patent number: 8457228
    Abstract: A device may be capable of communicating using at least two type types of modulation methods. Methods and systems are provided for communication of data according to a communications method in which a master transceiver communicates with one or more slave transceivers according to a master/slave relationship. A first data message may include first information and second information that are modulated according to a first modulation method. The second information may include lower data rate data. A second data message may include third information that may be modulated according to the first modulation method and that may indicate an impending change to a second modulation method. The second modulation method may be used for transmitting fourth information, and the fourth information may be included in the second message. The fourth information may include higher data rate data, for example Internet access data.
    Type: Grant
    Filed: August 4, 2011
    Date of Patent: June 4, 2013
    Inventor: Gordon F. Bremer
  • Patent number: 8451939
    Abstract: A radio communication apparatus includes a baseband signal generator to generate digital data; a clock generator to generate 2N pulse signals corresponding to the digital data; a selector to select one of the 2N pulse signals; and a short pulse generator to reduce a pulse width of the signal selected by the selector, wherein the 2N pulse signals include a whole-period non-transmission pulse, a whole-period transmission pulse, and 2N-2 partial-period transmission pulses, when the partial-period transmission pulse is selected, a band pass filter outputs a signal that lasts for part of a period having a 1-symbol length, when the whole-period non-transmission pulse is selected, the band pass filter outputs a signal attenuated by offsetting signals corresponding to the whole-period non-transmission pulse, and when the whole-period transmission pulse is selected, the band pass filter outputs a signal that lasts for a whole of the period having the 1-symbol length.
    Type: Grant
    Filed: March 23, 2011
    Date of Patent: May 28, 2013
    Assignee: Fujitsu Limited
    Inventor: Yasuhiro Nakasha
  • Publication number: 20130082794
    Abstract: Extending pulse width modulation phase offset when generating phase shifted groups of pulse width modulation (PWM) signals is accomplished with a separate phase counter that is independent of the time-base counters used in traditional PWM generation circuits and that is prevented from being retriggered until an existing duty cycle has completed. This is accomplished with a phase offset counter, a phase comparator and a circuit that is triggered via a master time base for overall synchronization of the multi-phase PWM signal generation.
    Type: Application
    Filed: September 29, 2011
    Publication date: April 4, 2013
    Inventor: Bryan Kris
  • Patent number: 8374233
    Abstract: An apparatus and methods for a baseband modulator configured to code amplitude signals into pulse width modulated time signals comprising at least two amplitude levels is disclosed. A pulse width modulator can receive a component signal of a baseband complex signal and generate a discrete-time pulse width modulated signal. This signal can be converted to a continuous time signal, such as a pulse-width modulated time signal and can be shifted to a carrier signal corresponding respectively to the component signal by a switch. Bursts sequences are generated to an input of a switched amplifier for driving operation of the amplifier therein.
    Type: Grant
    Filed: September 25, 2008
    Date of Patent: February 12, 2013
    Assignee: Intel Mobile Communications GmbH
    Inventors: Peter Singerl, Thomas Blocher, Andreas Wiesbauer
  • Patent number: 8351480
    Abstract: A pulse width modulation method for controlling the output power of a pulsed gas discharge laser powered by a pulsed RF power supply comprises delivering a train of digital pulses to the RF power supply. Each pulse in the train has an incrementally variable duration. The power supply is arranged to deliver a train of RF pulses corresponding in number and duration to the train of digital pulses received. The average power in the RF-pulse train can be varied by incrementally varying the duration of one or more of the digital pulses in the digital pulse train. The train of RF pulses is used to power a gas discharge laser. The gas discharge laser outputs a pulse train corresponding to the RF pulse train.
    Type: Grant
    Filed: March 30, 2010
    Date of Patent: January 8, 2013
    Assignee: Coherent, Inc.
    Inventor: David John Allie
  • Publication number: 20120319794
    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: August 17, 2012
    Publication date: December 20, 2012
    Applicant: ADVANTEST CORPORATION
    Inventors: Daisuke Watanabe, Toshiyuki Okayasu
  • 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
  • Publication number: 20120188024
    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: Application
    Filed: September 30, 2010
    Publication date: July 26, 2012
    Applicant: NEC CORPORATION
    Inventor: Shingo Yamanouchi
  • Patent number: 8169272
    Abstract: A multi-phase pulse-modulated polar transmitter and a method of generating a pulse-modulated envelope signal carrying modulated RF signal. Multi-phase pulse modulation technique or similar multi-phase pulse modulation techniques are employed in conjunction with a plurality of power amplifiers to enhance the bandwidth of the transmitter and to reduce out-of-band emissions and noises while easily synchronizing the phase and envelope of the input signal.
    Type: Grant
    Filed: August 12, 2010
    Date of Patent: May 1, 2012
    Assignee: National Taiwan University
    Inventors: Jau-Horng Chen, Yi-Jan Emery Chen
  • Publication number: 20120002755
    Abstract: A multi-level pulse modulated polar transmitter and a method of generating multi-level pulse modulated RF signals carrying phase information, in conjunction with a plurality of power amplifiers, so as to enhance the bandwidth of the transmitter and to reduce spurious emission and noise while synchronizing the phase and envelope of the input signals.
    Type: Application
    Filed: October 21, 2010
    Publication date: January 5, 2012
    Applicant: NATIONAL TAIWAN UNIVERSITY
    Inventors: Jau-Horng Chen, Yi-Jan Emery Chen
  • Publication number: 20110254636
    Abstract: A multi-phase pulse-modulated polar transmitter and a method of generating a pulse-modulated envelope signal carrying modulated RF signal. Multi-phase pulse modulation technique or similar multi-phase pulse modulation techniques are employed in conjunction with a plurality of power amplifiers to enhance the bandwidth of the transmitter and to reduce out-of-band emissions and noises while easily synchronizing the phase and envelope of the input signal.
    Type: Application
    Filed: August 12, 2010
    Publication date: October 20, 2011
    Applicant: NATIONAL TAIWAN UNIVERSITY
    Inventors: Jau-Horng Chen, Yi- Jan Emery Chen
  • Patent number: 8023580
    Abstract: A device may be capable of communicating using at least two type types of modulation methods. The device may include a transceiver capable of acting as a master according to a master/slave relationship in which communication from a slave to a master occurs in response to communication from the master to the slave. The master transceiver may send transmissions discrete transmissions structured with a first portion and a payload portion. Information in the first portion may be modulated according to a first modulation method and indicate an impending change to a second modulation method, which is used for transmitting the payload portion. The discrete transmissions may be addressed for an intended destination of the payload portion.
    Type: Grant
    Filed: August 19, 2009
    Date of Patent: September 20, 2011
    Inventor: Gordon F. Bremer
  • Publication number: 20110170639
    Abstract: A modulator performs data processing operations such as interpolation and fractional delay adjustment on amplitude and/or phase data by performing shift operations in lieu of multiplication operations. In selected embodiments, the modulator samples input data at a first rate, processes the sampled input data using the first rate, and then interpolates the processed data to produce interpolated data. The modulator then samples the interpolated data at a second rate higher than the first rate and generates output data at the second rate.
    Type: Application
    Filed: March 22, 2011
    Publication date: July 14, 2011
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Dmitry VOLOSHIN, Il-Yong JONG
  • 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: 7912144
    Abstract: A modulating means for modulating and/or demodulating data for transmission from a first device to a second device, wherein the modulating means is capable of modulating and/or demodulating data according to at least a first and a second modulation technique.
    Type: Grant
    Filed: August 25, 2003
    Date of Patent: March 22, 2011
    Assignee: Samsung Electronics Co., Ltd
    Inventors: Terence Edwin Dodgson, Charles Tibenderana
  • Publication number: 20110032047
    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: Application
    Filed: May 17, 2010
    Publication date: February 10, 2011
    Applicant: KYOSAN ELECTRIC MFG. CO., LTD.
    Inventors: Itsuo Yuzurihara, Yoshihisa Hata
  • Patent number: 7872546
    Abstract: A dual mode modulator is proposed for driving a power output stage having a serial connection of high-side power FET and low-side power FET. The dual mode modulator includes a PWM modulator operating under a PWM-frequency and a PFM modulator for controlling the power output stage. To improve the dynamic load regulation of the dual mode modulator, a dynamic frequency booster can be added to the dual mode modulator to boost up the PWM-frequency from its normal operating frequency during a PFM-to-PWM mode transition period. Secondly, a dynamic slew rate booster can be added to boost up an error amplifier slew rate of the PWM modulator from its normal operating slew rate during the mode transition period. Thirdly, a dynamic turn-off logic circuit can be added to turn off the low-side power FET during the mode transition period.
    Type: Grant
    Filed: July 7, 2009
    Date of Patent: January 18, 2011
    Assignee: Alpha and Omega Semiconductor Incorporated
    Inventors: Behzad Mohtashemi, Allan Chang
  • 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: 7719376
    Abstract: Modulator system (1) comprising modulators (2, 3, 4) for modulating input signals (A) according to different modulation schemes (8PSK, GMSK) cause discontinuities in the output signals (F) when switching between the schemes. By providing the modulator systems (1) with compensators (13, 22-26) for compensating amplitudes/phases of the output signals (F) of the modulator system (1) for discontinuities, these discontinuities resulting from modulation scheme changes are reduced to a large extent. This may be done before/after the pulse shapers (11, 21). The compensators (13, 22-26) comprise multipliers for multiplying pulse shaped modulated signals with complex valued waveforms (E), or for multiplying modulated signals with waveforms (S, T), or for multiplying complex valued signals (B, C, D) with complex valued phase offsets (X, Y, Z), which complex valued signals (B, C, D) are to be multiplied with mapped input signals.
    Type: Grant
    Filed: November 24, 2004
    Date of Patent: May 18, 2010
    Assignee: ST-Ericsson SA
    Inventors: Alexander Lampe, Rainer Dietsch
  • Publication number: 20100073102
    Abstract: An apparatus and methods for a baseband modulator configured to code amplitude signals into pulse width modulated time signals comprising at least two amplitude levels is disclosed. A pulse width modulator can receive a component signal of a baseband complex signal and generate a discrete-time pulse width modulated signal. This signal can be converted to a continuous time signal, such as a pulse-width modulated time signal and can be shifted to a carrier signal corresponding respectively to the component signal by a switch. Bursts sequences are generated to an input of a switched amplifier for driving operation of the amplifier therein.
    Type: Application
    Filed: September 25, 2008
    Publication date: March 25, 2010
    Applicant: Infineon Technologies AG
    Inventors: Peter Singerl, Thomas Blocher, Andreas Wiesbauer
  • Patent number: 7675965
    Abstract: A single subscriber line multi-point communication system is disclosed. In general, the multi-point communication system can include a first transceiver coupled to a subscriber line capable of transmitting and receiving at least two modulation methods, either of said modulation methods being operable to transmit a test signal, and a second transceiver coupled to said subscriber line capable of transmitting and receiving said at least two modulation methods, the second transceiver being operable to receive the test signal and determine at least one channel parameter from the test signal. A master transceiver that can be used in various embodiments of a single subscriber line multi-point communication system, and a tributary transceiver are further disclosed.
    Type: Grant
    Filed: July 9, 2007
    Date of Patent: March 9, 2010
    Assignee: Summit Technology Systems LP
    Inventor: Gordon Bremer
  • Patent number: 7590044
    Abstract: A method and apparatus for interleaving within a communication system is provided herein. More particularly parameters for a convolutional turbo code interleaver are provided, and interleaving takes place utilizing the new parameters. The new parameters generate interleavers that have the correct turbo code behaviors of improving performance with increasing block size and an error floor well below a block error rate of 10?4. Furthermore, the parameters have no implementation impact. Interleaving in accordance with the preferred embodiment of the present invention can achieve a block error rate of 10?4 at a signal-to-noise ratio that is at least 0.5 dB, and in some cases up to 1.3 dB, smaller than that which can be achieved with the code using the existing parameters.
    Type: Grant
    Filed: November 14, 2005
    Date of Patent: September 15, 2009
    Assignee: Motorola, Inc.
    Inventors: T. Keith Blankenship, Yufei Wu Blankenship, Brian K. Classon
  • Patent number: 7590181
    Abstract: In an adaptive modulation and coding method one or more adjustable values are created (S1), each corresponding to at least one of a plurality of available modulation and coding levels applicable to a signal transmitted from a transmitter to a receiver, and each representing a change to the level(s) to which it corresponds. One or more of said adjustable values is/are adjusted in dependence upon whether or not the signal is received successfully by the receiver (S2-S5). One of said available modulation and coding levels is selected (S6-S8) to apply to the signal based on such an adjustable value. Such a method can enable the appropriate modulation and coding level to be selected even when the path and channel conditions vary. The method is applicable to selecting modulation and coding levels in a high-speed downlink packet access system of a wireless communication network.
    Type: Grant
    Filed: July 29, 2004
    Date of Patent: September 15, 2009
    Assignee: Fujitsu Limited
    Inventors: Yassin Aden Awad, Sunil Keshavji Vadgama
  • 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
  • Publication number: 20090015344
    Abstract: Modulator system (1) comprising modulators (2, 3, 4) for modulating input signals (A) according to different modulation schemes (8PSK, GMSK) cause discontinuities in the output signals (F) when switching between the schemes. By providing the modulator systems (1) with compensators (13, 22-26) for compensating amplitudes/phases of the output signals (F) of the modulator system (1) for discontinuities, these discontinuities resulting from modulation scheme changes are reduced to a large extent. This may be done before/after the pulse shapers (11, 21). The compensators (13, 22-26) comprise multipliers for multiplying pulse shaped modulated signals with complex valued waveforms (E), or for multiplying modulated signals with waveforms (S, T), or for multiplying complex valued signals (B, C, D) with complex valued phase offsets (X, Y, Z), which complex valued signals (B, C, D) are to be multiplied with mapped input signals.
    Type: Application
    Filed: November 24, 2004
    Publication date: January 15, 2009
    Inventors: Alexander Lampe, Rainer Dietsch
  • Patent number: 7446621
    Abstract: The switching method between pulse frequency modulation and pulse width modulation signals is first based on an output voltage of a power transistor to generate a corresponding pulse frequency modulation signal. Next, it is determined whether the corresponding pulse frequency modulation signal has reached its maximal frequency. If so, the initial pulse width modulation signal is adjusted to have the same width as the pulse frequency modulation signal. Thereafter, the adjusted pulse width modulation signal is outputted.
    Type: Grant
    Filed: June 6, 2007
    Date of Patent: November 4, 2008
    Assignee: Advanced Analog Technology, Inc.
    Inventors: Li Chieh Chen, Yu Min Sun, Chu Yu Chu
  • Publication number: 20080260019
    Abstract: The burst oscillation device 20 includes the data generation part 21, the operation part 11, the signal selecting part 40 and the burst generation part 50. The generation part outputs the encoded data encoded based on data for communication. At the signal selecting part 40, the pulse release timing of predetermined repetition period is randomly delayed by the PPM and further delayed randomly by the minimal time by means of the PSK modulation, thereby realizing the decreasing of the peak value of the average power spectral density.
    Type: Application
    Filed: June 13, 2008
    Publication date: October 23, 2008
    Applicant: The Furukawa Electric Co., Ltd.
    Inventor: Yasushi AOYAGI
  • Publication number: 20080258833
    Abstract: A signal generator including a DDS-signal source that is configured to operate according to the principle of direct digital synthesis (DDS), and a PLL signal synthesizer that is configured to operate according to the principle of phase locked loop (PLL) using an output signal from the DDS-signal source as a reference signal. The DDS-signal source can be connected via a direct connection, without further frequency division or mixing, directly to an output of the signal generator or directly to a level-adjustment device of the signal generator in order to generate a portion of an overall frequency range of an output signal of the signal generator.
    Type: Application
    Filed: October 11, 2006
    Publication date: October 23, 2008
    Applicant: Rohde & Schwarz GmbH & Co. KG
    Inventors: Bernhard Richt, Joachim Danz, Guenther Klage
  • 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
  • Publication number: 20080218284
    Abstract: The switching method between pulse frequency modulation and pulse width modulation signals is first based on an output voltage of a power transistor to generate a corresponding pulse frequency modulation signal. Next, it is determined whether the corresponding pulse frequency modulation signal has reached its maximal frequency. If so, the initial pulse width modulation signal is adjusted to have the same width as the pulse frequency modulation signal. Thereafter, the adjusted pulse width modulation signal is outputted.
    Type: Application
    Filed: June 6, 2007
    Publication date: September 11, 2008
    Applicant: ADVANCED ANALOG TECHNOLOGY, INC.
    Inventors: Li Chieh Chen, Yu Min Sun, Chu Yu Chu
  • Patent number: 7298791
    Abstract: In an exemplary embodiment, a multi-rate data conversion circuit receives digital data at varying data rates, receives a data rate input corresponding to the digital data and converts the digital data to a converted output based upon the data rate input. A direct digital synthesis circuit receives the converted output and synthesizes a modulated output signal based upon the converted output. A multi-rate converter receives the digital data, the data rate input and a clock signal and converts the digital data to converted digital data. A multi-rate digital data filter receives the converted digital data and produces a filtered digital output. An output scaler receives the filtered digital output and produces a scaled and filtered digital output. Finally, an adder combines the scaled and filtered digital output with a center frequency input and produces the converted output.
    Type: Grant
    Filed: March 25, 2003
    Date of Patent: November 20, 2007
    Assignee: Intermec IP Corp.
    Inventors: Ronald L. Mahany, Thomas J. Schuster, Michael K. Ellis, Daniel E. Alt
  • 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: 7248626
    Abstract: A single subscriber line multi-point communication system is disclosed. In general, the multi-point communication system can include a first transceiver coupled to a subscriber line capable of transmitting and receiving at least two modulation methods, either of said modulation methods being operable to transmit a test signal, and a second transceiver coupled to said subscriber line capable of transmitting and receiving said at least two modulation methods, the second transceiver being operable to receive the test signal and determine at least one channel parameter from the test signal. A master transceiver that can be used in various embodiments of a single subscriber line multi-point communication system, and a tributary transceiver are further disclosed.
    Type: Grant
    Filed: April 14, 2003
    Date of Patent: July 24, 2007
    Assignee: Paradyne Corporation
    Inventor: Gordon Bremer
  • Patent number: 7133462
    Abstract: A method and apparatus for determining an optimum modulation scheme for a retransmission in a communication system supporting HARQ. When two modulation schemes are available, at an initial transmission, information is modulated in the lower-order modulation scheme if a first MPR is less than a first threshold, and in the higher-order modulation scheme if the first MPR is greater than or equal to the first threshold. Here, an MPR is determined by an EP size, the number of available Walsh codes, and the number of slots per sub-packet that are used for a transmission. To select one of the modulation schemes for a retransmission, a second MPR is calculated using an EP size, the number of available Walsh codes, and the number of slots per sub-packet that are used for the retransmission. If the first MPR is equal to or less than a second threshold greater than the first threshold, the lower-order modulation scheme is selected.
    Type: Grant
    Filed: November 20, 2002
    Date of Patent: November 7, 2006
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Sang-Hyuck Ha, Min-Goo Kim
  • Patent number: 7012477
    Abstract: The present invention provides a means to implement amplitude and phase modulation digitally and directly at an RF frequency that benefits from high output power without the use of amplifiers. This is accomplished by the combination of two varying amplitude and phase vectors. A reference oscillator produces a carrier signal, which is supplied to two digital delay lines composed of a sequence of delay banks. The delay lines are controlled by lookup tables that are updated by the vector control circuit, used to determine the delay of each digital delay line. The output of each delay line is multiplexed to a switching bank which is also controlled by the vector control circuit. The output of the switching bank, in combination with a summer, is used to produce discrete amplitude adjustment of the vector.
    Type: Grant
    Filed: March 10, 2004
    Date of Patent: March 14, 2006
    Assignee: VCom Inc.
    Inventors: Gerald Harron, Jason T. Tucker, Surinder Kumar
  • Patent number: 6982607
    Abstract: The present invention provides a means to implement amplitude and phase modulation digitally and directly at an RF frequency that benefits from high output power using non-linear amplifiers. This is accomplished by the combination of two constant amplitude phase varying vectors. A reference oscillator produces a carrier signal, which is supplied to two digital delay lines composed of a sequence of delay banks. The delay lines are controlled by lookup tables that are updated by the vector control circuit used to determine the delay of each digital delay line. The delay of the lines are set in such a way as to produce two vectors with the desired phase shift that, when summed together, produce a vector with the desired phase and amplitude characteristics.
    Type: Grant
    Filed: March 10, 2004
    Date of Patent: January 3, 2006
    Assignee: VCom Inc.
    Inventors: Gerald Harron, Jason T. Tucker, Surinder Kumar
  • Patent number: 6912249
    Abstract: A system and method for training a radio receiver to mitigate the effects of ISI caused by multi-path includes receiving a header of a transmitted packet at the receiver, the header containing at least one flag to identify a corresponding reference training sequence to be selected by the receiver and to indicate whether a training sequence is inserted in a packet. The receiver decodes the header to determine whether a training sequence is indicated by the flag and to select the corresponding reference training sequence. The training sequence is transmitted positioned within a data packet at a midamble between the header and a first segment of the data packet. The received training sequence is compared with the selected reference training sequence and the equalization parameters of the receiver are adjusted based on the results of the comparison. The selected reference training sequence corresponds to the modulation scheme applied to the payload.
    Type: Grant
    Filed: March 15, 2001
    Date of Patent: June 28, 2005
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventor: Jacobus Haartsen
  • Patent number: 6909337
    Abstract: Disclosed is a noncoherent pulse position and phase shift keying (PPPSK) transmission/reception system and a transmission/reception signal processing method therefor. Transmission system has an information generation unit for generating information data; a modulation unit for deciding a phase and a timing position corresponding to generated information data; and a wavelet generation unit for generating a wavelet based on the decided phase and timing position, and the reception system has an offset unit for mixing the reception signal with a high-frequency component corresponding to a center frequency of a transmission frequency band and offsetting a high frequency of the reception signal; a demodulation unit for generating at least one reference signal based on a previous signal precedingly received with respect to the reception signal and mixing the reference signals and the reception signal; and a decision unit for deciding information data corresponding to the reception signal based on mixing results.
    Type: Grant
    Filed: September 8, 2003
    Date of Patent: June 21, 2005
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Wan-jin Kim, Do-hoon Kwon, Woo-kyung Lee, Yong-suk Kim
  • Patent number: 6865235
    Abstract: A multi-protocol modulator capable of supporting two or more different modes of operation, each mode of operation corresponding to a different type of modulation, comprises an m-level phase shift keying (m-PSK) modulator which receives a serial input data stream and maps data contained therein into a constellation including m equidistant phases in accordance with a predetermined mapping scheme. The m-PSK modulator is shared by at least two different modulation protocols by allowing the mapping scheme to be selectively changed depending upon the modulation protocol used. The multi-protocol modulator further includes a phase rotator operatively coupled to the output of the m-PSK modulator. The phase rotator selectively rotates the phase of the m-PSK signal by a predetermined phase rotation value. The phase rotator is shared by the two or more modulation protocols by allowing the phase rotation value to be selectively modified depending upon the modulation protocol used.
    Type: Grant
    Filed: March 6, 2001
    Date of Patent: March 8, 2005
    Assignee: Agere Systems Inc.
    Inventor: Ramin Khoini-Poorfard
  • Patent number: 6862317
    Abstract: A digital data modulator is coupled to a source of a digital data signal. An encoder encodes the digital data using a variable pulse width code. A pulse signal generator generates pulses representing edges of the encoded digital data signal. A carrier signal generator generates a carrier signal having carrier pulses corresponding to the pulses from the pulse signal generator. A corresponding digital data demodulator is coupled to a source of a modulated signal having carrier pulses spaced relative to each other to represent a variable pulse width encoded digital data signal. A detector generates a variable pulse width encoded signal in response to received carrier pulses. A decoder decodes the variable pulse width encoded signal to generate the digital data signal.
    Type: Grant
    Filed: July 25, 2000
    Date of Patent: March 1, 2005
    Assignee: Thomson Licensing S.A.
    Inventors: Chandra Mohan, Zhiming Zhang, Jayanta Majumdar