Pulse Width Modulation Patents (Class 375/238)
  • Patent number: 10530343
    Abstract: A system for monitoring pulse width modulation (PWM) duty operation execution for motor control, which can detect whether or not the PWM duty operation execution used for torque and speed control of a motor is performed normally within an interrupt execution timing, and perform failure diagnosis depending upon the detected result, thus enhancing stability of motor control.
    Type: Grant
    Filed: October 4, 2018
    Date of Patent: January 7, 2020
    Assignees: Hyundai Motor Company, Kia Motors Corporation
    Inventors: Chang Seok You, Min Su Kang, Sung Do Kim, Dong Hun Lee
  • Patent number: 10455442
    Abstract: Systems, methods, and devices enable the implementation of antenna diversity techniques. Devices include a first wireless communications device that includes a plurality of antennas, and a transceiver coupled to the plurality of antennas and configured to send and receive data in accordance with a wireless transmission protocol, while the peer wireless communication device may have a single antenna or multiple antennas. Devices also include a processor configured to, in a first mode, calculate an angle of arrival (AoA) with the plurality of antennas or an angle of departure (AoD) associated with single antenna, and, in a second mode, send data to and receive data from a second wireless communications device via at least a first antenna of the plurality of antennas, where the first antenna is selected by the processor based on one of a first plurality of signal measurements between the first and second wireless communications devices.
    Type: Grant
    Filed: December 20, 2018
    Date of Patent: October 22, 2019
    Assignee: Cypress Semiconductor Corporation
    Inventors: Kaiping Li, Kamesh Medapalli, Jie Lai, Wenyu Liu, Thaiyalan Appadurai
  • Patent number: 10354611
    Abstract: An apparatus comprises a programmable delay line (PDL) to receive a pulse-width modulation (PWM) signal as input and to generate a first output; a selection unit to provide PWM signal or its inverted version as a second output; and a sequential unit coupled to the PDL to sample the second output with the first output and to generate a pulse-frequency modulation (PFM) output. A voltage regulator comprises mutually coupled on-die inductors for coupling to a load; a bridge coupled to the mutually coupled on-die inductors, including a low-side switch and a high-side switch; a PWM controller for controlling the low-side and high-side switches during a first load current; and a PFM controller for controlling the low-side and high-side switches during a second load current, the second load current being smaller than the first load current, the PFM controller comprising a comparator and a first PDL coupled to the comparator.
    Type: Grant
    Filed: July 3, 2017
    Date of Patent: July 16, 2019
    Inventors: Fenardi Thenus, Peng Zou, Raghu Nandan Chepuri, Henry K. Koertzen
  • Patent number: 10348137
    Abstract: A power supply apparatus comprises: a power supply unit configured to perform wireless power supply to an electronic device; a communication unit configured to communicate with the electronic device using power for the wireless power supply; one or more processors; and a memory storing instructions which, when the instructions are executed, cause the power supply apparatus to function as: an acquisition unit configured to acquire information for performing communication using the power; and a control unit configured to control communication with the electronic device based on the information, wherein in a case where the electronic device can perform communication using the power, the control unit controls the communication unit such that a modulation degree indicating a degree to which an amplitude changes in amplitude modulation for the communication is smaller the higher the power transmitted is.
    Type: Grant
    Filed: February 23, 2018
    Date of Patent: July 9, 2019
    Inventor: Nobuyuki Tsukamoto
  • Patent number: 10275615
    Abstract: Methods are described herein for communications bus data transmission using relative ground shifting. A plurality of voltage lines of at least one electronic control unit (ECU) are monitored. The at least one ECU electrically coupled to a communications bus. A voltage differential across at least two of the plurality of voltage lines of the at least one ECU is measured. A pulse or data stream is injected into the communications bus via one or two voltage lines based on the measured voltage differential having an amplitude lower than a predetermined voltage threshold.
    Type: Grant
    Filed: March 17, 2017
    Date of Patent: April 30, 2019
    Assignee: Cylance Inc.
    Inventors: Donald Bathurst, Mark Carey
  • Patent number: 10236866
    Abstract: A timer including a Pulse Width Modulation (PWM) signal generator configured to generate, based on a clock, a PWM signal having a first frequency resolution; a PWM time shifter configured to receive from the PWM signal generator the PWM signal having the first frequency resolution, and output a PWM signal having a second frequency resolution, wherein the second frequency resolution is higher than the first frequency resolution; and a control monitor configured to: control the PWM time shifter to time shift rising edges or falling edges of the PWM signal by an amount corresponding with a second frequency resolution.
    Type: Grant
    Filed: April 26, 2017
    Date of Patent: March 19, 2019
    Assignee: Infineon Technologies AG
    Inventor: Pedro Costa
  • Patent number: 10205620
    Abstract: In a transmission circuit that transmits transmission data using an amplitude shift modulation method (ASK modulation method) for changing an amplitude of carrier waves based on the transmission data or a transmission system that uses the transmission circuit, a phase of the carrier waves is changed based on the transmission data to suppress an irradiation of carrier wave components.
    Type: Grant
    Filed: December 27, 2016
    Date of Patent: February 12, 2019
    Inventor: Norihito Mihota
  • Patent number: 10164650
    Abstract: A system and method for pulse-width modulation (PWM) mismatch shaping. The method includes receiving a multi-bit pulse-code modulated (PCM) signal and generating a voltage ramp signal. The method includes generating a first corrected signal based on a first feedback signal and the multi-bit PCM signal. The method includes generating a first single-bit PWM signal based on the first corrected signal and the voltage ramp signal. The method includes delaying the voltage-ramp signal and generating a second corrected signal based on a second feedback signal and the multi-bit PCM signal. The method includes generating a second single-bit PWM signal based on the second corrected signal and the delayed voltage ramp signal and generating a multi-bit pulse-density modulation (PDM) signal based on the first single-bit PWM signal and the second single-bit PWM signal.
    Type: Grant
    Filed: February 16, 2017
    Date of Patent: December 25, 2018
    Assignee: QUALCOMM Incorporated
    Inventors: Jingxue Lu, Matthew Sienko
  • Patent number: 10153756
    Abstract: A signal transmission system includes a switch component and a choke component each coupled to one of a first power wire and a second power wire, a first conductive path between the switch component and a load, a second conductive path between the choke component and the load, and a control block. The control block controls the switch component to not conduct when providing a control signal to the first and/or second conductive paths. When the switch component does not conduct, a magnetic core of the choke component does not reach magnetic saturation. When the switch component conducts, the magnetic core of the choke component operates at magnetic saturation.
    Type: Grant
    Filed: August 25, 2016
    Date of Patent: December 11, 2018
    Inventor: Yu-Cheng Hung
  • Patent number: 10142050
    Abstract: An encoding modulation method and transmitter are described. The method includes: oversampling and noise-shaping received multi-bit data to obtain N bits of data; using the N bits of data as a lookup table address to obtain a PWM puke modulation signal; multiplexing synthetic orthogonal (IQ) complex data of the PWM pulse modulation signal to be real number signal data; and converting the multiplexed real number signal data to an analog signal for power amplification and output, N being an integer representing a smaller number of bits than the received multi-bit data.
    Type: Grant
    Filed: April 9, 2015
    Date of Patent: November 27, 2018
    Inventors: Peng Dong, Jun Tao
  • Patent number: 10108511
    Abstract: System, methods and apparatus are described that offer improved performance of an Inter-Integrated Circuit (I2C) bus. A method of testing a spike filter in a legacy I2C device includes generating a command to be transmitted on a serial bus in accordance with an I2C protocol, where the command includes an address corresponding to the legacy slave device, merging the command with a sequence of pulses to obtain a test signal, transmitting the test signal on the serial bus, and determining the efficacy of a spike filter in the first slave device based on whether the legacy slave device acknowledges the test signal. Each pulse in the sequence of pulses has a duration that is less than 50 ns. The spike filter is expected to suppress pulses that have a duration of less than 50 ns.
    Type: Grant
    Filed: June 10, 2016
    Date of Patent: October 23, 2018
    Assignee: QUALCOMM Incorporated
    Inventor: Radu Pitigoi-Aron
  • Patent number: 10028242
    Abstract: The present disclosure provide a transmission method and a device, which relate to the technical field of communications and reduce overhead and improve work efficiency in an application of cooperative transmission in aspects of synchronization, sharing of information such as data and the like, obtaining of channel information and data transmission. Meanwhile application scenarios may also be extended. The method specifically includes: obtaining, by an access point AP, a parameter value, wherein the parameter value is a frequency difference between a crystal oscillator frequency of the AP and a reference crystal oscillator frequency of a reference AP or a delay difference of the AP with respect to the reference AP; compensating, by the AP, a phase difference or a time difference according to the parameter value when both of the AP and the reference AP send data. The present disclosure is applied to an application of a cooperative transmission.
    Type: Grant
    Filed: April 20, 2016
    Date of Patent: July 17, 2018
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Xun Yang, Yi Luo
  • Patent number: 9978599
    Abstract: An ion implantation system has a first chamber and a process chamber with a heated chuck. A controller transfers the workpiece between the heated chuck and first chamber and selectively energizes the heated chuck first and second modes. In the first and second modes, the heated chuck is heated to a first and second temperature, respectively. The first temperature is predetermined. The second temperature is variable, whereby the controller determines the second temperature based on a thermal budget, an implant energy, and/or an initial temperature of the workpiece in the first chamber, and generally maintains the second temperature in the second mode. Transferring the workpiece from the heated chuck to the first chamber removes implant energy from the process chamber in the second mode. Heat may be further transferred from the heated chuck to a cooling platen by a transfer of the workpiece therebetween to sequentially cool the heated chuck.
    Type: Grant
    Filed: May 31, 2017
    Date of Patent: May 22, 2018
    Assignee: Axcelis Technologies, Inc.
    Inventors: Marvin Farley, Mike Ameen, Causon Ko-Chuan Jen
  • Patent number: 9878662
    Abstract: Provided are methods and systems for smart backlighting. For example, there is provided a system for use with a vehicle. The system includes a primary subsystem configured to perform a first function. Further, the system includes a backlight subsystem configured to perform a second function, the second function being independent of the first function. Moreover, the system can includes a controller configured to generate a single signal including a first instruction for causing the primary subsystem to perform the first function and a second instruction for causing the backlight subsystem to perform the second function.
    Type: Grant
    Filed: August 3, 2015
    Date of Patent: January 30, 2018
    Assignee: GM Global Technology Operations LLC
    Inventors: Daniel P. Carlesimo, Marcelo V. Lazarini
  • Patent number: 9681388
    Abstract: Systems and methods are disclosed for low power RF communications, comprising receiving an AM signal using a passive RF receiver circuit, converting the AM signal to a digital output signal using a comparator, receiving the digital output signal from the comparator, determining whether the digital output signal is valid or not using a digital signal processing circuit, and upon detection of a valid digital output signal, enabling an active RF receiver circuit for RF signal processing.
    Type: Grant
    Filed: November 5, 2015
    Date of Patent: June 13, 2017
    Assignee: Cox Communications, Inc.
    Inventor: Kinney Chapman Bacon
  • Patent number: 9634679
    Abstract: A digital down converter with equalization includes a composite ADC that performs demodulation of a received analog signal, converting the signal into in phase baseband signal and quadrature baseband signal. Equalization is performed to correct for misalignment of the frequency responses of the sub-ADCs in the composite ADC. In a form, ADC output signals are applied to a mixer array to frequency down-shift the digital form of the input signal, followed by digital filtering to effect convolutions of portions of the digital form of the input signal with a set of convolution coefficients determined so that the net processing is mathematically equivalent to down conversion with equalization. In another form, the ADC output signals are directly applied to a digital filter to effect both frequency down-shifting and convolutions, with filter coefficients determined so that the net processing is mathematically equivalent to down conversion with equalization.
    Type: Grant
    Filed: August 19, 2016
    Date of Patent: April 25, 2017
    Assignee: Guzik Technical Enterprises
    Inventors: Anatoli B. Stein, Semen P. Volfbeyn, Alexander Taratorin, Igor Tarnikov, Valeriy Serebryanskiy
  • Patent number: 9632896
    Abstract: A built-in self-testing method of a near field communication device including several functions tests a first internal communication link between a first function and a second function. The testing is performed by sending, on said first internal communication link, a first command from said first function used as a transmitter to said second function used as a receiver, and by checking said first command has been correctly executed by said second function.
    Type: Grant
    Filed: May 9, 2014
    Date of Patent: April 25, 2017
    Assignee: Optis Circuit Technology, LLC
    Inventor: Achraf Dhayni
  • Patent number: 9612614
    Abstract: A pulse-drive resonant clock with on-the fly mode changing provides robust operation in a resonant clock distribution network, in particular for processor circuits having a dynamically-varied operating frequency. The clock drivers for the resonant clock distribution network include a pulse width control circuit having selectable operating modes corresponding to multiple clocking modes of the resonant clock distribution network. The pulse width control circuit includes a delay line that has a selectable delay length to provide pulse enable signals that control the pulse widths of the clock drivers in a sector of the resonant clock distribution network. The delay line responds to a mode control signal so that at least one pulse width of the output is changed from a first pulse width to a second pulse width without generating half-cycles with a pulse width narrower than the first or second pulse width.
    Type: Grant
    Filed: July 31, 2015
    Date of Patent: April 4, 2017
    Inventors: Thomas J. Bucelot, Robert L. Franch, Phillip J. Restle, David Wen-Hao Shan, Christos Vezyrtzis
  • Patent number: 9439006
    Abstract: The present subject matter provides systems and methods for remotely controlling a hearing assistance device, including using a personal wireless device such as a cellular telephone. One embodiment includes a communication system for controlling a hearing assistance device. The system includes a personal wireless device including a short range radio transmitter. The short range radio transmitter is programmed to transmit instructions to the hearing assistance device by conversion of inputs to the personal wireless device into control signals for the hearing assistance device using on/off keying of the short range radio transmitter.
    Type: Grant
    Filed: November 17, 2014
    Date of Patent: September 6, 2016
    Assignee: Starkey Laboratories, Inc.
    Inventors: Michael Karl Sacha, Wei Li Lin, Jay Ashwin Shah
  • Patent number: 9438452
    Abstract: A system having has a pulse width modulation controller to successively activate each of a plurality of channels each in its own individual channel time slot is described. The system also has a sampling multiplexer configured to successively sample a signal derived from each of the plurality of channels during each individual channel time slot. Each individual time slot has an individual sampling sequence.
    Type: Grant
    Filed: January 17, 2014
    Date of Patent: September 6, 2016
    Assignee: Infineon Technologies Austria AG
    Inventor: Olivier Dominique Ploix
  • Patent number: 9425680
    Abstract: A ripple-based control switching regulator includes a switch, an inductor, a capacitor, an output voltage processing unit and a control unit. Where the switch is utilized to output selectively output a first reference voltage or a second reference voltage as an output voltage according to a control signal. The inductor is coupled to the switch, and produces an inductor output voltage according to the output voltage. The capacitor is coupled to the inductor. The output voltage processing unit is used to output a processed inductor output voltage according to the output voltage and the inductor output voltage. The control unit is used to output the control signal according to at least the processed inductor output voltage.
    Type: Grant
    Filed: March 2, 2015
    Date of Patent: August 23, 2016
    Assignee: Realtek Semiconductor Corp.
    Inventor: Shih-Chieh Chen
  • Patent number: 9425781
    Abstract: A PWM receiver circuit receives and demodulates pulse width modulated (PWM) data signals without requiring synchronization such that no synchronization preamble need be provided with the PWM data signal. Embodiments may consume less power since there is no need to repeatedly synchronize a PLL, counter or other circuitry to the PWM data signal. Furthermore, the PWM receiver circuit operates in view of or is “tolerant” to jitter in the frequency of the PWM signal and also to a relatively wide range of intentional variation in the frequency. Interleaved operation of parallel PWM receiver circuits are utilized in some embodiments. In one embodiment currents are integrated during low and high portions of the duty cycle of the PWM data signal and the difference in the respective voltages generated through such integration used to demodulate the PWM data signal.
    Type: Grant
    Filed: March 31, 2014
    Date of Patent: August 23, 2016
    Inventors: Tapas Nandy, Anchal Jain
  • Patent number: 9390360
    Abstract: A NFC payment module and controlling method are provided. The NFC payment module is embedded in a smart device and includes an encapsulation shell, a micro controller, a radio-frequency chip, an antenna, and a security chip. The phase detection and the power amplification can be performed by the radio-frequency chip with the antenna, which is commanded by the smart device. Therefore, the modulation phase angle is adjusting until the modulation phase angel is equal to the specific phase angle of the transaction signal.
    Type: Grant
    Filed: August 17, 2015
    Date of Patent: July 12, 2016
    Inventors: Ming-Heng Yang, Ching-Hsiang Hung
  • Patent number: 9389628
    Abstract: A digitally controlled buck boost regulator includes an H-bridge circuit including a plurality of switches configured to receive an input voltage signal and generate an output voltage signal based on the input voltage signal and switching signals provided thereto. A controller generates a pulse width modulation (PWM) control value in response to a value of the output voltage signal, and a quantizer/mapper receives the PWM control value and provides a first mapping to a mapped PWM control value if the PWM control value is outside a predetermined range of PWM control values, and generates a second mapping to a mapped PWM control value if the PWM control value is within the predetermined range. A digital pulse width modulator is configured to generate switching signals based on the mapped PWM control value, and provide the generated switching signals to the H-bridge circuit.
    Type: Grant
    Filed: March 12, 2013
    Date of Patent: July 12, 2016
    Assignee: Intel Deutschland GmbH
    Inventor: David Herbison
  • Patent number: 9381738
    Abstract: A liquid jet apparatus according to the present invention includes a drive waveform generator adapted to generate a drive waveform signal, a modulator adapted to execute pulse modulation on the drive waveform signal, a digital power amplifier adapted to power-amplify the modulated signal, on which the pulse modulation is executed by the modulator, with a pair of switching elements push-pull coupled with each other, a low pass filter adapted to smooth the amplified digital signal obtained by the power-amplification of the digital power amplifier, and a modulation period modification circuit adapted to modify a modulation period of the pulse modulation of the modulator based on data of the drive waveform signal.
    Type: Grant
    Filed: December 23, 2013
    Date of Patent: July 5, 2016
    Inventors: Noritaka Ide, Kunio Tabata, Atsushi Oshima, Shinichi Miyazaki, Hiroyuki Aizawa, Seiichi Taniguchi
  • Patent number: 9350449
    Abstract: The visible light communication device includes a control circuit configured to repeat a transmission process of transmitting a communication signal through modulating an intensity of visible light to be emitted from a light source. The control circuit is configured to, in the transmission process, arbitrarily select a time slot for transmission from a plurality of time slots set within a predetermined time period allocated to the transmission process, and transmit the communication signal in the time slot for transmission.
    Type: Grant
    Filed: July 8, 2014
    Date of Patent: May 24, 2016
    Assignee: Panasonic Corporation
    Inventors: Shinichiro Haruyama, Shuji Suzuki, Shojirou Kido, Eiji Shiohama
  • Patent number: 9344072
    Abstract: A pulse width modulation (PWM) signal generation circuit and method are disclosed herein. The PWM signal generation circuit includes an integer part pulse generation circuit, and a fractional part pulse generation circuit. The integer part pulse generation circuit generates an integer part pulse using the integer part of the digitized value of a duty cycle, i.e., the ratio of the time during which any one of high and low levels is maintained to the period of a PWM signal. The fractional part pulse generation circuit generates the PWM signal using the integer part pulse and the fractional part of the digitized value of the duty cycle.
    Type: Grant
    Filed: March 2, 2015
    Date of Patent: May 17, 2016
    Inventor: Chang Min Kim
  • Patent number: 9294079
    Abstract: A method for generating a multi-band signal transforms multiple base-band envelope signals into a sequence of symbols representing a signal including a plurality of disjoint frequency bands. Each frequency band corresponds to a single base-band envelope signal. Each symbol corresponds to amplitude of the signal and is a number selected from a finite set of numbers. The method encodes the sequence of symbols as a plurality of pulse width modulation (PWM) signals. Each PWM signal includes a plurality of codes for encoding each symbol, such that a sum of values of the codes of the set of PWM signals encoding a symbol is proportional to a value of the symbol. The method amplifies the PWM signals to produce a plurality of amplified signals and combines the amplified signals to produce the multi-band signal.
    Type: Grant
    Filed: November 10, 2014
    Date of Patent: March 22, 2016
    Assignee: Mitsubishi Electric Research Laboratories, Inc.
    Inventors: Rui Ma, SungWon Chung, Koon Hoo Teo
  • Patent number: 9276430
    Abstract: A multi-phase charging circuit comprises a device that can be configured for master mode operation or slave mode operation. In master mode operation, the device generates a control signal and a clock signal to control operation of a switching circuit for generating charging current. In slave mode operation, the device receives externally generated control and clock signals to control operation of its switching circuit.
    Type: Grant
    Filed: October 29, 2013
    Date of Patent: March 1, 2016
    Assignee: QUALCOMM, Incorporated
    Inventors: Christian G Sporck, Giovanni Garcea, Shadi Hawawini
  • Patent number: 9268488
    Abstract: A memory life extension system and method is provided for managing operation of rewritable memory used to store a monotonically increasing sequence of multiple-byte binary values in a set of one or more memory locations in the rewritable memory. A first value is read in from a set of one or more memory locations. On detection of an instruction to store an incremented value, the incremented value is permuted by applying an encoding, in which a value of a least significant bit changes only on every second increment, to two least significant bits of the incremented value. On overflow of a least significant byte as a result of the increment, a cyclic byte-wise shift is applied to the incremented value. The permuted incremented value is then stored in the one or more memory locations.
    Type: Grant
    Filed: June 4, 2014
    Date of Patent: February 23, 2016
    Assignee: Levven Automation Inc.
    Inventor: Yi Dong
  • Patent number: 9264269
    Abstract: In one embodiment, a method receives a pulse width modulation signal. A value that is a function of the pulse width modulation signal is determined. The value is used to modulate a switching frequency of the pulse width modulation signal to generate a modulated pulse width modulation signal. The applied value reduces electro-magnetic interference from tones in the modulated pulse width modulation signal.
    Type: Grant
    Filed: December 18, 2014
    Date of Patent: February 16, 2016
    Assignee: Marvell World Trade Ltd.
    Inventor: Kapil Jain
  • Patent number: 9240776
    Abstract: Analog-to-digital pulse width modulation circuitry includes thermometer code generator circuitry, clock generator circuitry, delay selection circuitry, and an output stage. The thermometer code generator circuitry is adapted to generate a digital thermometer code based upon a received analog input voltage. The clock generator circuitry is adapted to generate a reference clock and a plurality of delayed clock signals. The delay selection circuitry is connected between the thermometer code generator circuitry and the clock generator circuitry, and is adapted to select one of the delayed clock signals to present to the output stage based upon the generated thermometer code. The selected delayed clock signal is delayed by an amount of time that is proportional to the generated thermometer code. The reference clock signal and the selected delayed clock signal are delivered to the output stage where they are used to generate a pulse width modulated output signal.
    Type: Grant
    Filed: January 28, 2013
    Date of Patent: January 19, 2016
    Assignee: RF Micro Devices, Inc.
    Inventors: David Zimlich, Joseph Hubert Colles, Ricke W. Clark, Chris Levesque
  • Patent number: 9214882
    Abstract: Determining the rotor angle of a synchronous machine. In one aspect, the invention provides a method that includes generating a multiplicity of pulse-width-modulated drive signals for the phases of an inverter feeding the synchronous machine depending on a voltage to be fed into the synchronous machine, and applying a first phase shift to one or more of the multiplicity of pulse-width-modulated drive signals, so that the duration of the switching states of the inverter is extended in order to generate a first switching pattern for the phases of the inverter. The method also includes applying a second phase shift to one or more of the multiplicity of pulse-width-modulated drive signals for generating a second switching pattern, selecting one or more of the first and second switching patterns, determining one or more of neutral point potentials at the neutral point of the synchronous machine, and calculating the rotor angle of the synchronous machine.
    Type: Grant
    Filed: December 4, 2013
    Date of Patent: December 15, 2015
    Assignee: Robert Bosch GmbH
    Inventors: Armin Niederer, Gerhard Knecht, Sebastian Paulus, Michael Koerner
  • Patent number: 9190906
    Abstract: A digital event generator includes a counter configured to provide at least one count value based on a clock signal, and a comparator configured to evaluate a first portion of a first count value to detect a near occurrence of an event, in response to a detection of a near occurrence of an event, evaluate a second portion of a second count value, and provide the event signal based on the evaluation and digital event time information. A switched mode energy converter uses said digital event generator.
    Type: Grant
    Filed: May 16, 2012
    Date of Patent: November 17, 2015
    Assignee: Intel Deutschland GmbH
    Inventor: Stephan Henzler
  • Patent number: 9166617
    Abstract: A communication unit comprises a power DAC. The DAC comprises: a switched mode power amplifier (SMPA); and a digital band-pass sigma-delta modulator operably coupled to the SMPA. The sigma-delta modulator comprises an input to receive an input baseband signal; a delay; an adder module arranged to add a feedback signal with an output from the delay; and at least two feedback branches. The sigma-delta modulator is arranged to digitally oversample the input baseband signal such that a ratio of a sampling frequency employed by the sigma-delta modulator to a radio frequency (RF) output from the DAC is fixed and the sampling frequency tuned or wherein the sampling frequency is fixed and the ratio is adjusted, such that a first feedback branch in the sigma-delta modulator is formed using at least one from a group of: a zero gain, an additive inverse of a second feedback branch.
    Type: Grant
    Filed: December 18, 2014
    Date of Patent: October 20, 2015
    Assignee: Freescale Semiconductor, Inc.
    Inventors: Hugues Beaulaton, Jean-Christophe Nanan
  • Patent number: 9137870
    Abstract: Method for communication between an electronic module and a sensor having a light source and being supplied by supply line, the electronic module measuring the modulations of the intensity of the current in the line. The sensor drives a gradual turning on/turning off of the light source by a first modulation of the intensity of the current such that: the light source is turned off, respectively turned on, when the intensity of the current is in a low, respectively high, state, and the light source illuminates, respectively turns off, when the duty ratio of the intensity of the current varies from the high state to the low state and vice versa. During detection, the sensor dispatches a second modulation through the light source, however if the light source is turning on (or off), this is interrupted and the intensity of current is forced to the high (or low) state.
    Type: Grant
    Filed: July 12, 2013
    Date of Patent: September 15, 2015
    Inventors: Stephan Baudru, Cyril Robin, Joel Carniaux
  • Patent number: 9130551
    Abstract: A decoder for decoding an input signal coded with a pulse width modulation code as a line code to an output signal in a binary code, has a first memory, a first timer, a determination circuit and a first controller. The information on a duty duration of the PWM code, corresponding to at least one kind of the output signals, is stored on the first memory. The first timer has a capacity to measure the duty duration of the input signal. The determination circuit has a capacity to determining which kind of the output signals corresponds to the input signal, on the basis of the information stored on the first memory and the duty duration measured with the first timer. The first controller has a capacity to updating the information stored on the first memory, on the basis of the determination result and the measured duty duration.
    Type: Grant
    Filed: July 30, 2013
    Date of Patent: September 8, 2015
    Inventors: Hideki Kashima, Tomohisa Kishigami, Naoji Kaneko
  • Patent number: 9130817
    Abstract: Described herein are an apparatus, system, and method for generating pulse modulated (PWM) signals. The apparatus (e.g., input-output transmitter) comprises: an edge detector to detect one of a rising or falling edges of a clock signal; a counter to count up or down in response to detecting one of the rising or falling edges of the clock signal, the counter to generate a select signal; and a control unit to receive a data signal for transmission to a receiver and to generate a PWM signal as output according to a value of the select signal and the data signal, wherein the receiver and the transmitter are a Mobile Industry Processor Interface (MIPI®) M-PHYSM receiver and transmitter.
    Type: Grant
    Filed: December 15, 2011
    Date of Patent: September 8, 2015
    Assignee: Intel Corporation
    Inventor: Wei-Lien Yang
  • Patent number: 9122294
    Abstract: A digitally controlled non-inverting buck-boost DC-DC converter system including a non-inverting buck-boost DC-to-DC converter control module and a negative feedback module and applicable for a radio frequency circuit module is revealed. By locking a duty cycle to two specific levels, the non-inverting buck-boost DC-to-DC converter control module only needs a single operation mode to achieve the required effects. Simultaneously, pulse-skipping phenomenon is also avoided. Furthermore, a reference voltage is modified through a reference voltage correction circuit of the negative feedback module to eliminate errors between previous DC output voltage and the reference voltage. Thereby the DC output voltage can remain in a stable state so as to reduce operational defects during the mode transition.
    Type: Grant
    Filed: January 9, 2013
    Date of Patent: September 1, 2015
    Assignee: National Cheng Kung University
    Inventors: Han-Chien Liu, Chien-Hung Tsai, Yu-Shin Tsai
  • Patent number: 9094153
    Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for transmitting data. In one aspect, a method obtains a baseline data rate for transmissions from a node that are received over a channel of a power line communications system and a set of available modulation techniques for the node. The set of available modulation techniques can include at least two modulation techniques with which the node is configured to encode data that are transmitted over the channel. Using the set of available modulation techniques, a modulation technique that is capable of providing at least the baseline data rate with at least a threshold confidence for the node is selected. In turn, data is provided to the node specifying the selected modulation technique.
    Type: Grant
    Filed: March 12, 2014
    Date of Patent: July 28, 2015
    Assignee: Landis+Gyr Technologies, LLC
    Inventors: Damian Bonicatto, Stuart L. Haug
  • Patent number: 9088273
    Abstract: Systems, methods, and other embodiments associated with estimating a natural sampling point from uniform sample points when generating a PWM signal are described. According to one embodiment, an apparatus includes a cross point logic configured to determine which of the samples along the analog signal are adjacent to a crossing point of a reference signal and the analog signal by identifying samples between which the crossing point occurs. The apparatus includes an interpolation logic configured to adaptively interpolate points along the analog signal that approach the crossing point by using the samples. The interpolation logic is configured to adaptively interpolate the points to refine a region between the points within which the crossing point occurs. The apparatus includes a search logic configured to search within the region to produce an estimated location of the crossing point by using the interpolated points.
    Type: Grant
    Filed: March 1, 2013
    Date of Patent: July 21, 2015
    Inventors: Sasan Cyrusian, Zining Wu, Kapil Jain
  • Patent number: 9071204
    Abstract: A power amplifier (PA) which improves dynamic range of previous ZVS contour-based power amplifier architectures is presented. The inventive circuit combines ZVS contour-based power amplification with a current mode digital-to-analog converter (DAC) based digital polar power amplifier. The inventive elements interoperate to provide high efficiency even at large peak power back-off levels and increased dynamic range. The invention is particularly well-suited for use in modulation schemes (e.g., WLAN/LTE/WIMAX) having large peak-to-average output power ratios. Utilizing the inventive PA in generating modulation in these systems can increase RF transmitter efficiency of by approximately two-fold.
    Type: Grant
    Filed: October 31, 2013
    Date of Patent: June 30, 2015
    Inventors: Sudhakar Pamarti, Nitesh Singhal
  • Patent number: 9054584
    Abstract: Various embodiments of the present invention relate to AC-DC adapters, and more particularly, to systems, devices and methods of employing a load detector to detect a load condition of the AC-DC adapters based on transient variation of a DC output voltage; and therefore, enable the AC-DC adapters to switch from a low power mode to a normal power mode. At the low power mode, a DC output voltage is generated at a target voltage by the AC-DC adapter, and subsequently drops at a decay rate dependent on load condition. The load detector is electrically coupled to monitor the output voltage and measure the decay time between two threshold voltages. An enable instruction is provided to configure the AC-DC adapter to the normal power mode as soon as the decay time is lower than the threshold decay time or the variation of consecutive decay times reaches a certain threshold.
    Type: Grant
    Filed: February 8, 2012
    Date of Patent: June 9, 2015
    Assignee: Maxim Integrated Products, Inc.
    Inventors: Carlton Michael Haight, David Wardell Ortte, Jr.
  • Publication number: 20150146773
    Abstract: A transmitter includes a first digital up-converter for converting data to an intermediate frequency (IF) signal, a pulse width modulator (PWM) for encoding the IF signal to an IF pulse train, a second digital up-converter for converting the IF pulse train to a radio frequency (RF) pulse train, a power amplifier for amplifying the RF pulse train; and a filter for reconstructing a RF analog signal from the amplified RF pulse train.
    Type: Application
    Filed: January 31, 2015
    Publication date: May 28, 2015
    Inventors: Rui Ma, Qiuyao Zhu, Koon Hoo Teo, Chunjie Duan
  • Publication number: 20150146772
    Abstract: A data receiver has a reception circuit and a fail-safe circuit. The reception circuit has an input amplifier, a logic signal processing circuit, and a reception stop control circuit. The fail-safe circuit has a high-pass filter, a comparator, and a pulse width extending circuit. The reception circuit receives a serial data of differential input signals based on a predetermined standard, converts the serial data into a serial data of a single-ended output signal, and outputs a converted serial data. The fail-safe circuit detects whether the differential input signals have a nonstandard small amplitude and outputs a fail-safe detection signal indicating a detection result.
    Type: Application
    Filed: November 25, 2014
    Publication date: May 28, 2015
    Inventor: Yasuhiro Fujimori
  • Patent number: 9036691
    Abstract: An RF signal generating circuit that generates, from a digital signal, an RF pulse signal to be radio-transmitted. It includes a polar converter generating an amplitude signal and a phase signal from the digital signal; a signal decomposer receiving the amplitude signal as an input signal, and generates two signals, a pulse width control signal and a residual signal; a delta sigma modulator subjecting the residual signal to delta-sigma modulation; a pulse width modulator subjecting the phase signal to pulse modulation in accordance with the pulse width control signal, and outputting a pulse phase signal; and a mixer that mixes a signal output from the delta sigma modulator and the pulse phase signal to output the RF pulse signal. The signal decomposer generates the pulse width control and residual signals if a product of a fundamental wave component of the pulse phase and residual signals equals the amplitude signal.
    Type: Grant
    Filed: August 21, 2012
    Date of Patent: May 19, 2015
    Inventor: Shinichi Hori
  • Patent number: 9035710
    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: Grant
    Filed: December 27, 2013
    Date of Patent: May 19, 2015
    Assignee: Ricoh Company, Ltd.
    Inventors: Takashi Michiyoshi, Tetsuro Tatebe
  • Publication number: 20150117512
    Abstract: A power encoder includes an amplitude-phase splitter for splitting an input signal into an envelope signal and a phase modulated signal, and a pre-distortion unit for distorting the envelope signal using a look-up table (LUT) to produce a distorted envelope signal. The power encoder also includes a digital converter for combining the distorted envelope signal with the phase modulated signal to produce a distorted input signal, a pulse width modulator (PWM) for modulating the distorted input signal according to the transformation function to produce a modulated signal, and a switch mode power amplifier for amplifying the modulated signal. The look-up table stores a non-linear mapping of a transformation function and a relationship between the distorted input signal and the modulated signal is non-linear.
    Type: Application
    Filed: October 25, 2013
    Publication date: April 30, 2015
    Applicant: Mitsubishi Electric Research Laboratories, Inc.
    Inventors: Rui Ma, Qiuyao Zhu, Koon Hoo Teo, Chunjie Duan
  • Patent number: 9020027
    Abstract: An integrated circuit includes: a digitally-controlled power generation stage for converting an input signal to a radio frequency (RF) carrier, the digitally-controlled power generation stage including a plurality of selectable switching devices capable of adjusting an envelope of the RF carrier; and a pulse width modulator (PWM) generator arranged to generate a PWM control signal according to a fractional word and operably coupleable to the plurality of selectable switching devices of the digitally-controlled power generation stage; wherein the PWM generator inputs the PWM control signal to a subset of the plurality of the selectable switching devices such that a PWM signal adjusts the envelope of the RF carrier output from the digitally-controlled power generation stage.
    Type: Grant
    Filed: January 24, 2014
    Date of Patent: April 28, 2015
    Assignee: MediaTek Singapore Pte. Ltd.
    Inventors: Robert Bogdan Staszewski, Min Park
  • Publication number: 20150103877
    Abstract: In one embodiment, a method receives a pulse width modulation signal. A value that is a function of the pulse width modulation signal is determined. The value is used to modulate a switching frequency of the pulse width modulation signal to generate a modulated pulse width modulation signal. The applied value reduces electro-magnetic interference from tones in the modulated pulse width modulation signal.
    Type: Application
    Filed: December 18, 2014
    Publication date: April 16, 2015
    Inventor: Kapil Jain