With Amplifier Condition Indicating Or Testing Means Patents (Class 330/2)
  • Patent number: 10236827
    Abstract: A method may include, in an apparatus comprising a closed loop amplifier and a signal processing block configured to generate an amplifier input signal as a function of an upstream signal received at an input of the signal processing block, in a calibration mode of the apparatus: decoupling a second stage input of the amplifier from a first stage output of the amplifier; determining an offset signal that when applied to the input of a signal processing block as the upstream signal generates approximately zero as an intermediate signal generated by the first stage of the amplifier; and controlling one or more parameters of the apparatus based on the offset signal to compensate for an offset of at least one of the first stage and the signal processing block.
    Type: Grant
    Filed: June 14, 2017
    Date of Patent: March 19, 2019
    Assignee: Cirrus Logic, Inc.
    Inventors: Lei Zhu, Ku He, Xin Zhao, Miao Song, Saurabh Singh, Vinod Jayakumar
  • Patent number: 10225118
    Abstract: A carrier leakage correction method for a quadrature modulator according to an embodiment includes inputting a test signal with a frequency fBB to a transmitter and up-converting the test signal with a frequency fL0 and down-converting with the frequency fL0. A frequency 2fBB component is detected in the down-converted test signal. One or a plurality of parameters of the transmitter is/are adjusted so as to reduce a magnitude of the detected frequency 2fBB component in the test signal.
    Type: Grant
    Filed: February 21, 2018
    Date of Patent: March 5, 2019
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
    Inventors: Yousuke Hagiwara, Shigehito Saigusa, Mitsuyuki Ashida, Yuki Fujimura, Ichiro Seto
  • Patent number: 10079702
    Abstract: Examples of front-end modules, apparatuses and methods for coupling compensation in a closed-loop digital pre-distortion (DPD) system are described. The closed-loop DPD circuit may include a PA and a loopback path. The PA may receive a PA input signal and amplify the PA input signal to provide a PA output signal proportional to a product of the PA input signal and a gain of the PA. The loopback path may receive the PA output signal to output a loopback signal. A forward coupling and a backward coupling may exist between the PA input signal and an output of the loopback path. The output of the loopback path may be proportional to a product of the PA output signal and a gain of the loopback path. The loopback path may include a coupling cancellation mechanism configured to cancel couplings between the PA input signal and the loopback signal.
    Type: Grant
    Filed: December 16, 2015
    Date of Patent: September 18, 2018
    Assignee: MEDIATEK SINGAPORE PTE. LTD.
    Inventors: YuenHui Chee, Fei Song, James Wang, Toru Matsuura, Osama K. A. Shana'a, Chiyuan Lu
  • Patent number: 10050608
    Abstract: A phase modulation (PM) noise reducer to reduce phase modulation noise of an oscillator, the PM noise reducer including: an amplitude modulation (AM) detector to receive a primary oscillator signal and to produce an AM detector signal based on the primary oscillator signal, the primary oscillator signal including a first phase modulation (PM) noise; a control circuit in electrical communication with the AM detector to receive the AM detector signal and to produce a control signal; a phase shifter in electrical communication with the control circuit to receive the primary oscillator signal and the control signal and to produce a secondary oscillator signal based on the primary oscillator signal and the control signal, the secondary oscillator signal comprising a second PM noise, wherein the second PM noise is less than the first PM noise.
    Type: Grant
    Filed: June 22, 2016
    Date of Patent: August 14, 2018
    Assignee: THE UNITED STATES OF AMERICA, AS REPRESENTED BY THE SECRETARY OF COMMERCE
    Inventors: Archita Hati, Craig Nelson, David Howe
  • Patent number: 10008283
    Abstract: A sample-and-hold circuit includes a sampling capacitor, a first transistor, a first switch between a gate electrode and a source electrode of the first transistor, a current source connected to the source electrode of the first transistor, and a resistive element and a second switch connected in parallel between a drain electrode of the first transistor and a predetermined voltage. The resistive element may include a second transistor biased to operate in a linear region according to a gate control signal at a gate electrode of the second transistor, or may include multiple transistor banks connected in parallel, each including a second transistor biased to operate in a linear region according to a gate control signal at a gate electrode of the second transistor. The gate control signal may originate from a circuit including a state machine.
    Type: Grant
    Filed: June 22, 2017
    Date of Patent: June 26, 2018
    Assignee: Sony Semiconductor Solutions Corporation
    Inventors: Noam Eshel, Amit Sokolover, Golan Zeituni
  • Patent number: 9948484
    Abstract: The present invention relates to a method and an apparatus for direct current offset calibration of a direct conversion receiver, a Direct Current (DC) offset calibration apparatus of a direct conversion receiver includes a plurality of variable gain amplifiers for amplifying an input signal based on a gain control value, a DC offset monitoring unit for monitoring a DC offset for an output signal of the plurality of variable gain amplifiers, a plurality of variable Digital to Analog Converters (DACs) for controlling a current applied to each of the plurality of variable gain amplifiers according to a current control code, and a DC offset cancellation unit for determining a current control code set which minimizes the DC offset value per preset gain control value, and thus the DC offset can be precisely cancelled without being affected by external factors such as a signal modulation method and heat and performance degradation of the receiver can be prevented.
    Type: Grant
    Filed: January 2, 2015
    Date of Patent: April 17, 2018
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Yi-Ju Roh, Ji-Hoon Kim, Ju-Ho Son, Yun-A Shim, Dong-Hyun Lee, Dong-Yun Jung, Sung-Tae Choi, Seung-Pyo Hong
  • Patent number: 9859856
    Abstract: An apparatus is provided which comprises: a differential input amplifying stage including a current source and a first node; a first matched pair of transistors coupled to the first node, wherein one of the transistors of the first matched pair is coupled to an output node of a driving stage; a second matched pair of transistors coupled to a second node to bias the second matched pair of transistors, wherein one of the transistors of the second matched pair of transistors is coupled to the output node of the driving stage, and wherein the second node is to be charged according to a first bias of the current source; and a resistive device coupled to the first and second nodes.
    Type: Grant
    Filed: June 30, 2016
    Date of Patent: January 2, 2018
    Assignee: Intel IP Corporation
    Inventor: John G. Kauffman
  • Patent number: 9749172
    Abstract: A method for calibrating mismatches of an in-phase signal path and a quadrature signal path of a receiver is proposed in the present invention, including: utilizing the receiver to receive at least one test signal with a specific frequency via the first signal path and the second signal path, to generate a first signal path received signal and a second signal path received signal; performing frequency analysis upon the first signal path received signal and the second signal path received signal respectively, to generate a first frequency analysis result and a second frequency analysis result; and calculating at least one calibration coefficient according to the first frequency analysis result and the second frequency analysis result. A method for calibrating mismatches of an in-phase signal path and a quadrature signal path of a transmitter is also proposed in the present invention.
    Type: Grant
    Filed: May 28, 2015
    Date of Patent: August 29, 2017
    Assignee: Realtek Semiconductor Corp.
    Inventors: Yuan-Shuo Chang, Ching-Chia Cheng
  • Patent number: 9714781
    Abstract: According to the present disclosure, in a container refrigeration apparatus configured to cool the inside of a container, the accuracy of determination of occurrence of a lock abnormality and a connection abnormality of a motor is increased, and erroneous detection of the motor abnormalities is reduced or prevented. The container refrigeration apparatus of the present disclosure includes an abnormality determinator configured to compare a value for current flowing through an in-compartment motor with a preset current threshold to determine occurrence of the motor abnormalities of the in-compartment motor, and a threshold changer configured to change the current threshold of the abnormality determinator in accordance with a supply voltage for each supply frequency of a power supply configured to supply power to the in-compartment motor.
    Type: Grant
    Filed: July 25, 2012
    Date of Patent: July 25, 2017
    Assignee: Daikin Industries, Ltd.
    Inventors: Akitoshi Ueno, Kiichirou Satou, Masataka Nakano
  • Patent number: 9698739
    Abstract: Aspects of this disclosure relate to systems and methods of performing dynamic impedance tuning. Certain aspects may be performed by or include a dynamic impedance matching network. The dynamic impedance matching network can determine a desired output power for a power amplifier, true power information for the power amplifier, and an output power delivered to a load by the power amplifier. In addition, the dynamic impedance matching network can determine whether the output power satisfies the true power information. Responsive to this determination, the dynamic impedance matching network may modify a load line impedance for the power amplifier using an impedance tuning network.
    Type: Grant
    Filed: September 29, 2015
    Date of Patent: July 4, 2017
    Assignee: Skyworks Solutions, Inc.
    Inventors: James Phillip Young, Joel Anthony Penticoff
  • Patent number: 9654156
    Abstract: A nonlinear compensating apparatus and method, a transmitter and a communication system are provided. The apparatus includes a preprocessor configured to preprocess a transmitted signal according to a pre-obtained preprocessing coefficient and a predistorter configured to perform predistortion for the preprocessed signal, and a result of comparison of a characteristic parameter of the signal that has been preprocessed and then predistorted with that of the transmitted signal satisfies a predetermined condition. By preprocessing the transmitted signal at the transmitter end, the embodiments of the present disclosure may perform efficient nonlinear compensation only needing to measure at the transmitter end and without needing to perform many times of measurement at the receiver end, and may lower complexity of circuits of the communication system and complexity of calculation.
    Type: Grant
    Filed: October 15, 2015
    Date of Patent: May 16, 2017
    Assignee: FUJITSU LIMITED
    Inventors: Bo Liu, Weizhen Yan, Lei Li
  • Patent number: 9614489
    Abstract: The invention provides one sound producing system including a speaker, a driving circuit and an audio controller. The speaker is used for producing an audible sound. The driving circuit is connected to the speaker. The audio controller is configured to receive an input audio signal and pre-amplify the input audio signal with an amplify gain to obtain a pre-amplified audio signal; operate a multiband dynamic range control on the pre-amplified audio signal to obtain an output audio signal; convert the output audio signal to a driving voltage; provide the driving voltage to the speaker through the driving circuit; detect over the driving circuit to obtain at least one excursion parameter to determine an estimated excursion of the speaker in response to the driving voltage; and adjust the amplify gain according to the estimated excursion.
    Type: Grant
    Filed: July 21, 2014
    Date of Patent: April 4, 2017
    Assignee: HTC Corporation
    Inventors: Chih-Chiang Cheng, Chun-Min Lee, Hann-Shi Tong
  • Patent number: 9608713
    Abstract: The present disclosure relates to an interference cancellation method and device of an ICS repeater using a leveler, and may effectively cancel only interference signals by using a leveler without using a magnetic correlation cancellation device or digital filter in order to cancel unnecessary noise signals generated by narrow-band signals and enable an ICS repeater design for an LTE wireless network that needs a short system time delay.
    Type: Grant
    Filed: August 19, 2014
    Date of Patent: March 28, 2017
    Assignee: RF WINDOW CO., LTD.
    Inventors: Yong Seok Oh, Young Cheol Jeon, Kyoung Soo Park
  • Patent number: 9588859
    Abstract: A detecting circuit includes: a testing signal generator, arranged to selectively generate a testing signal having a first signal edge or a second signal edge to a connecting port; and a detector, arranged to detect a first detect signal on the connecting port after the testing signal having the first signal edge is coupled to the connecting port, and to detect a second detect signal on the connecting port after the testing signal having the second signal edge is coupled to the connecting port; wherein the detector is further arranged to determine if an external circuit element is coupled between the connecting port and a reference voltage according to the first detect signal and the second detect signal.
    Type: Grant
    Filed: November 13, 2013
    Date of Patent: March 7, 2017
    Assignee: MEDIATEK INC.
    Inventors: Chien-Hua Wu, Kuan-Hua Chao
  • Patent number: 9564046
    Abstract: A method and/or computer program product receives inputs from a wearable input device. A communication session is established between a wearable input device and a receiving hardware device. The receiving hardware device receives an input from the wearable input device that is generated in response to a conformational change to a shape of the wearable input device, wherein the conformational change is applied to a random section of the wearable input device. The receiving hardware device thereafter initiates a responsive action that is associated with the input from the wearable input device, wherein the responsive action occurs within the receiving hardware device.
    Type: Grant
    Filed: July 11, 2014
    Date of Patent: February 7, 2017
    Assignee: International Business Machines Corporation
    Inventors: Ilse M. Breedvelt-Schouten, Jana H. Jenkins, Jeffrey A. Kusnitz, James L. Lentz
  • Patent number: 9525385
    Abstract: Limiting clipping in an amplifier is accomplished in the feedback loop of a class D PWM amplifier that includes an integrator coupled to an input node and configured to generate an integrated input signal such that a comparator may then generate a PWM signal for driving an amplifier output stage based on a comparison to a triangle wave signal. To this end, the amplifier also includes a threshold signal generator for generating high and low voltage thresholds based on the triangle wave signal to be used to engage compensation circuits for limiting the overall amplification. Such compensation circuits may be bipolar junction transistors that are disposed in the feedback loop of the integrator. Thus, the overall bandwidth of the amplifier itself is not affected by adding a limiter circuit aimed at reducing clipping.
    Type: Grant
    Filed: November 6, 2014
    Date of Patent: December 20, 2016
    Assignee: STMICROELECTRONICS (SHENZHEN) R&D CO. LTD
    Inventor: Hong Wu Lin
  • Patent number: 9503031
    Abstract: The invention provides an auto configuration method for an operational amplifier in an electronic system. The method includes steps of estimating an internal resistance of the electronic system; estimating an operation frequency of the electronic system; and determining a control parameter to adjust a characteristic of the operational amplifier according to the internal resistance and the operation frequency.
    Type: Grant
    Filed: January 21, 2015
    Date of Patent: November 22, 2016
    Assignee: WINBOND ELECTRONICS CORP.
    Inventors: Sheng-Cheng Lee, Herming Chiueh
  • Patent number: 9467224
    Abstract: A method and a device for determining an input optical power are provided. The method include: after determining a bias current value of an optical amplifier unit when the optical amplifier unit amplifies a target optical signal and a voltage value output after an optical receiving unit converts the amplified target optical signal into an electrical signal, determining, according to a predetermined first correspondence that is among a bias current value, a voltage value, and an input optical power value and corresponds to a wavelength of the target optical signal, an input optical power value corresponding to the determined bias current value and the determined voltage value. By using the solution in the embodiments of the present invention, an input optical power of an optical signal on which optical amplification is performed can be determined.
    Type: Grant
    Filed: December 8, 2014
    Date of Patent: October 11, 2016
    Assignee: Huawei Technologies Co., Ltd.
    Inventor: Ming Qi
  • Patent number: 9407246
    Abstract: A phase modulation (PM) noise reducer includes: an amplitude modulation (AM) detector to receive a primary oscillator signal and to produce an AM detector signal, the primary oscillator signal including a first PM noise; and a control circuit to receive the AM detector signal, to produce a control signal, and to communicate the control signal to a phase shifter, wherein the phase shifter receives the primary oscillator signal and control signal, and the oscillator produces a secondary oscillator signal that includes a second PM noise that is less than the first PM noise, and further including; a PM detector and power splitter receives the primary oscillator signal, splits a power of the primary oscillator signal, and communicates the primary oscillator signal to the AM detector and PM detector.
    Type: Grant
    Filed: May 19, 2015
    Date of Patent: August 2, 2016
    Assignee: THE UNITED STATES OF AMERICA, AS REPRESENTED BY THE SECRETARY OF COMMERCE
    Inventors: Archita Hati, Craig Nelson, David Howe
  • Patent number: 9405220
    Abstract: An optical sensor configured to irradiate an object area with light and receive reflected light, amplify a voltage in accordance with the reflected light by an amplifier circuit and a resulting voltage, the optical sensor comprising a recording medium recorded with information indicating a noise component calculated, based on characteristics of an input voltage and an output voltage of the amplifier circuit.
    Type: Grant
    Filed: August 27, 2014
    Date of Patent: August 2, 2016
    Assignee: OMRON CORPORATION
    Inventors: Yoshitaka Taishi, Hajime Kawai, Junichi Yoshida
  • Patent number: 9383398
    Abstract: Disclosed is a motor power simulating apparatus for fuel cell power module evaluation that accurately reflects real world characteristics of a fuel cell vehicle. More particularly, the power simulating apparatus disclosed herein includes a fuel cell power module, a ripple current generator, and an electronic load device, the ripple current generator connected to the fuel cell power module and the electronic load device to accurately simulate power output from a fuel cell of a fuel cell vehicle under real world conditions.
    Type: Grant
    Filed: November 28, 2012
    Date of Patent: July 5, 2016
    Assignee: Hyundai Motor Company
    Inventors: Sung Bum Choi, Ii Hee Cho
  • Patent number: 9385664
    Abstract: A digital pre-distortion system which can provide the flexibility to model the highly non-linear distortion associated with High Efficiency RF Power Amplifiers while through a novel implementation of a least squares estimation process allows an implementation well suited for an FPGA application where limited resources and in particular memory resources are available.
    Type: Grant
    Filed: December 19, 2013
    Date of Patent: July 5, 2016
    Assignee: ACEAXIS NETWORK TECHNOLOGY LTD
    Inventors: Philip Brown, Jeremy Segar, John Ibison, Frank Friedman, Stephen Cooper
  • Patent number: 9362876
    Abstract: The present invention includes a digital controller for use with an ultrasound power amplifier circuit to increase linearity and efficiency of the ultrasound power amplifier circuit. The digital controller includes a digital signal generator and a memory unit that is coupled to the digital signal generator. The memory unit includes a processor that obtains an output signal from the ultrasound power amplifier circuit, calculates error by obtaining a difference between an ideal output signal and the output signal that is obtained from the ultrasound power amplifier circuit, and equalizes an input signal from the digital signal generator to reduce nonlinearity in the output signal of the ultrasound power amplifier circuit. The memory unit includes a look-up-table for storing values of error.
    Type: Grant
    Filed: December 21, 2012
    Date of Patent: June 7, 2016
    Assignee: Southern Methodist University
    Inventors: Zheng Gao, Ping Gui
  • Patent number: 9354653
    Abstract: A power supply circuit includes a first power amplifier that amplifies an input signal; a high pass filter that removes frequency components that are lower than a predetermined first cutoff frequency from an output signal of the first power amplifier; a current detector that detects a current value of the output signal of the first power amplifier; a composite signal generation circuit that combines the input signal and an output signal of the current detector; a second power amplifier that amplifies an output signal of the composite signal generation circuit; a low pass filter that removes frequency components that are higher than a predetermined second cutoff frequency from an output signal of the second power amplifier; and a signal output terminal that combines a current of an output signal of the high pass filter and a current of an output signal of the low pass filter and then outputs the resultant signal.
    Type: Grant
    Filed: April 11, 2012
    Date of Patent: May 31, 2016
    Assignee: NEC CORPORATION
    Inventor: Kiyohiko Takahashi
  • Patent number: 9322719
    Abstract: A temperature-measurement input stage may include a resistor, a thermistor, a first multiplexor, an amplifier, a second multiplexor, and an output stage. The first multiplexor may be configured to couple the resistor to a first amplifier input during a first multiplexor state, and couple the thermistor to the first amplifier input during a second multiplexor state. The amplifier may comprise the first amplifier input, a second amplifier input coupled to a voltage reference, and an amplifier output coupled to a feedback path. The second multiplexor may be configured to route a feedback current to the resistor during the first multiplexor state and route the feedback current to the thermistor during the second multiplexor state. The output stage may be configured to provide an output current based on the feedback current.
    Type: Grant
    Filed: May 29, 2013
    Date of Patent: April 26, 2016
    Assignee: Intel IP Corporation
    Inventors: Merit Hong, David Harnishfeger, Kris Kaufman
  • Patent number: 9306531
    Abstract: A tunable and trimmable analog filter may include a tunable analog filter and a trimming circuit. The tunable analog filter may set the frequency of a characteristic of the tunable analog filter based on a digital tuning signal that is indicative of a desired frequency of the characteristic. However, the tunable analog filter may contain components having values that deviate from specified values due to var during manufacture of the tunable analog filter. The value deviations can cause the frequency of the characteristic not to precisely match the frequency indicated by the digital tuning signal. The trimming circuit may include a non-volatile memory that contains data. The trimming circuit may receive tuning information indicative of a desired frequency for the characteristic of the tunable analog filter.
    Type: Grant
    Filed: March 6, 2014
    Date of Patent: April 5, 2016
    Assignee: Linear Technology Corporation
    Inventor: Petrus Martinus Stroet
  • Patent number: 9252714
    Abstract: A transmission signal power control device includes: at least one low-power attenuator configured to attenuate amplitude of a transmission signal when an absolute value of the amplitude of the transmission signal is smaller than or equal to a clipping threshold; a power amplifier configured to amplify the transmission signal output from the at least one low-power attenuator; and a control unit configured to stop operation of the power amplifier when the absolute value of the amplitude of the transmission signal is smaller than or equal to a value and operate the power amplifier when the absolute value of the amplitude of the transmission signal is larger than the value.
    Type: Grant
    Filed: October 30, 2013
    Date of Patent: February 2, 2016
    Assignee: FUJITSU LIMITED
    Inventor: Alexander Nikolaevich Lozhkin
  • Patent number: 9231538
    Abstract: An energy efficient, low distortion amplification apparatus includes: a differential amplifier having a pair of differential inputs, a pair of outputs, and a bias current control input; a digital delay having an n-bit word input and an m-bit word output; a digital-to-analog converter (DAC) having an input coupled to the output of the digital delay and a pair of differential outputs coupled to the pair of differential inputs of the differential amplifier; and a bias current controller having an input coupled to the digital delay and having an output coupled to the bias current control input of the differential amplifier.
    Type: Grant
    Filed: December 26, 2013
    Date of Patent: January 5, 2016
    Assignee: Maxim Integrated Products, Inc.
    Inventors: Joel D. Birkeland, Matthew G. Waight, Charles J. Razzell
  • Patent number: 9209846
    Abstract: A radio communication circuit includes a transmitter that includes a modulator modulates a signal with a first modulation scheme and a power amplifier amplifies the signal modulated with the first modulation scheme and output the amplified signal and transmits the amplified signal, a receiver that includes a demodulator demodulates the signal output from the transmitter with a second modulation scheme that is different from the first modulation scheme, a pre-distortion compensator compensates occurred upon the amplification of the signal, of the signal input to the transmitter, based on the demodulated signal and a power controller controls supply of power to the receiver and the pre-distortion compensator and stop the supply of the power based on an average power level of the signal output from the transmitter and a peak-to-average power ratio that is a ratio of an instantaneous peak power level to the average power level.
    Type: Grant
    Filed: August 29, 2014
    Date of Patent: December 8, 2015
    Assignee: FUJITSU LIMITED
    Inventors: Youji Nakata, Setsuya Nagaya, Kosei Nishimura, Masaaki Saitou, Mikio Hayashihara, Atsushi Kudo
  • Patent number: 9191034
    Abstract: Disclosed is a communication modulator with sample rate conversion. The modulator comprises a symbol mapping module configured to map an input bitstream to a symbol sequence; a pre-distortion module configured to multiply the symbol sequence by a discrete frequency response to produce a pre-distorted symbol sequence; a modulation module configured to modulate the pre-distorted symbol sequence to a time-domain baseband sample sequence; a sample rate conversion module configured to convert the sample rate of the baseband sample sequence to a different sample rate to produce a sample-rate-converted baseband sample sequence; and an up-conversion module configured to up-convert the sample-rate-converted baseband sample sequence to an intermediate frequency signal. The discrete frequency response by which the pre-distortion module multiplies the symbol sequence is configured to compensate for passband droop introduced to the sample-rate-converted baseband sample sequence by the sample rate conversion module.
    Type: Grant
    Filed: March 9, 2011
    Date of Patent: November 17, 2015
    Assignee: Commonwealth Scientific and Industrial Research Organisation
    Inventors: Xiaojing Huang, Yingjie Jay Guo, Jian Zhang
  • Patent number: 9118368
    Abstract: A signal coupler can couple a processed version of an outgoing signal from a transmission path to a receive path in a transceiver. A connector can provide the processed version of the outgoing signal to a pre-distortion module, which can generate a pre-distortion signal to pre-compensate outgoing signals in the transmission path of the transceiver. A receive path of a transceiver can thus be utilized as a feedback path to a pre-distortion module.
    Type: Grant
    Filed: June 17, 2013
    Date of Patent: August 25, 2015
    Assignee: L-3 Communications Corp.
    Inventor: Kyle D. Holzer
  • Patent number: 9088260
    Abstract: A method of controlling operating parameters of a radio frequency power amplifier amplifying an input signal applied in bursts with controlled input power to an input of the power amplifier, comprising responding to gain variation parameters relating to variations in the scalar gain of said amplifier starting during an initial ramp-up period of a first burst to control supply voltage and quiescent current parameters for said amplifier during a subsequent burst.
    Type: Grant
    Filed: December 3, 2008
    Date of Patent: July 21, 2015
    Assignee: Freescale Semiconductor, Inc.
    Inventors: Francois Dupis, Jacques Trichet
  • Patent number: 9083292
    Abstract: An analog feedback amplifier is capable of suppressing extraneous phase fluctuations and broadening a bandwidth by preventing effects of a group delay element by using an amplitude regulator 21 and a delay line 24.
    Type: Grant
    Filed: December 26, 2011
    Date of Patent: July 14, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventors: Tatsuo Kohama, Kenichi Horiguchi, Morishige Hieda
  • Patent number: 9059721
    Abstract: An electronic device includes an input configured to receive at least one baseband input signal and at least one mixer downstream from the input. The electronic device also includes a phase-locked loop (PLL) including a voltage controlled oscillator (VCO) and a phase detector coupled thereto, the VCO coupled to the at least one mixer. A power amplifier is downstream from the at least one mixer and generates at least one aggressing signal that would otherwise generate an output pull of the VCO. The electronic device also includes a VCO pulling compensation circuit coupled to the input and the VCO and configured to compensate the VCO for the output pull based upon the at least one baseband input signal and the at least one aggressing signal.
    Type: Grant
    Filed: January 12, 2011
    Date of Patent: June 16, 2015
    Assignee: BLACKBERRY LIMITED
    Inventor: Khurram Muhammad
  • Patent number: 9054646
    Abstract: The invention relates to an electronic integrated amplifier for driving an acoustic transducer. The amplifier comprises two differential input terminals to receive an input signal and a first and a second output terminal to provide an output signal to the transducer. In addition, the amplifier comprises an operational amplifier having an input end including differential inputs and an output end operatively associated with the first and second output terminals. A pair of input resistors connect the two differential input terminals to two intermediate terminals, respectively. A pair of feedback resistors connect the first and second output terminals to the two intermediate terminals, respectively. The integrated amplifier also comprises means for high-pass filtering the input signal.
    Type: Grant
    Filed: August 2, 2011
    Date of Patent: June 9, 2015
    Assignee: ST-ERICSSON SA
    Inventors: Germano Nicollini, Federico Guanziroli, Massimo Orio, Carlo Pinna
  • Publication number: 20150145594
    Abstract: A power amplifier includes an amplifier element and overstress management circuitry coupled to the amplifier element. The overstress management circuitry is configured to detect an overstress condition of the amplifier element and adjust one or more operating parameters of the amplifier element in response to the detection of an overstress condition of the amplifier element. Using the overstress management circuitry prevents damage to the amplifier element that may occur due to uncorrected overstress conditions which may degrade or destroy a gate oxide of the amplifier element. Accordingly, the longevity of the amplifier element is improved.
    Type: Application
    Filed: November 26, 2014
    Publication date: May 28, 2015
    Inventors: Baker Scott, George Maxim, Dirk Robert Walter Leipold
  • Publication number: 20150130535
    Abstract: There is disclosed a technique for controlling at least one amplification stage, comprising: selecting a linearity objective for the amplification stage; in dependence on an input signal to said amplification stage, determining a combination of supply input and bias input for the amplification stage in order to meet said linearity objective; and in dependence on there being more than one combination of supply input and bias input for meeting the linearity objective, selecting the combination that optimises a further system performance objective for the amplification stage. The further system performance objective may be one or more of: an efficiency objective; an envelope signal bandwidth objective; or a robustness to production tolerance objective.
    Type: Application
    Filed: January 16, 2015
    Publication date: May 14, 2015
    Inventors: Gerard Wimpenny, Julian Hildersley, Robert Henshaw, Yi Qin
  • Publication number: 20150109054
    Abstract: Ready-flag circuitry for differential amplifiers. In some embodiments, a semiconductor device may include an amplifier including two inputs, and a ready-flag circuit operably coupled to the amplifier, the ready-flag circuit configured to monitor two or more internal nodes of the amplifier and to produce a signal indicating whether a voltage or current difference between the two inputs has been minimized. In other embodiments, a method may include monitoring, via a ready-flag circuit, a first and a second internal node of a differential amplifier, wherein the differential amplifier is part of a bandgap voltage reference circuit and producing, via the ready-flag circuit, a signal indicating whether an output of the bandgap voltage reference circuit has reached a nominal value.
    Type: Application
    Filed: October 18, 2013
    Publication date: April 23, 2015
    Applicant: Freescale Semiconductor, Inc.
    Inventors: Andre Luis Vilas Boas, Edevaldo Pereira Silva, JR., Pedro Barbosa Zanetta, Eduardo Ribeiro da Silva
  • Patent number: 8975955
    Abstract: An analysis technique for (Doherty) amplifiers having a main amplifier branch and at least one peak amplifier branch. For a given input power level and assumed amplifier impedance levels, an output power level and phase response are obtained for each active device using appropriate load-pull data based on the impedance levels. The performance of the amplifier is analyzed based on the impedance levels, output power levels, and phase responses to generate updated impedance levels. The analysis is repeated until the updated impedance levels converge on steady state values. The analysis can be repeated for different input power levels. Main and peak output matching networks for the amplifier can be designed by iteratively adjusting impedance levels for the networks using appropriate load-pull contours. For the design and analysis phases, the load-pull contours include Class-AB data for the main amplifier device and Class-C data for the peak amplifier device.
    Type: Grant
    Filed: December 11, 2012
    Date of Patent: March 10, 2015
    Assignee: Alcatel Lucent
    Inventors: Igor Acimovic, Brian Racey
  • Patent number: 8970294
    Abstract: A distribution amplifier with intellectual signaling comprises a first connector, a first amplifier, a second connector, a power regulator, an inductive coil, a voltage detecting circuit, a first indicating lamp, a second amplifier and a second indicating lamp. The distribution amplifier with intellectual signaling may effectively display whether the distribution amplifier operates normally or not according to the above-mentioned arrangement.
    Type: Grant
    Filed: November 15, 2012
    Date of Patent: March 3, 2015
    Assignee: Lantek Electronics, Inc.
    Inventor: Shan-Jui Lu
  • Publication number: 20150048882
    Abstract: The present disclosure relates to an apparatus comprising at least two operational amplifiers, a first and a second current input, at least one voltage output, and at least two resistors, wherein a first current source is connectable to the first current input, and a test current source is connectable to the second current input, and wherein the first current input is connected to an inverting input of the first operational amplifier and the second current input is connected to an inverting input of the second operational amplifier, and a first feedback resistor is connected between the output and the inverting input of the first operational amplifier and a second feedback resistor is connected between the output and the inverting input of the second operational amplifier, and wherein the voltage output is connected to the outputs of the first and the second operational amplifier.
    Type: Application
    Filed: August 19, 2013
    Publication date: February 19, 2015
    Inventors: Ulrich Schacht, Oliver Piepenstock
  • Publication number: 20150035593
    Abstract: An amplifier circuit with an input power detector and a related method are described. With the input power detector and related control network, the arrangement enables and/or disables a number of unit cells in power amplifiers.
    Type: Application
    Filed: August 2, 2013
    Publication date: February 5, 2015
    Applicant: Peregrine Semiconductor Corporation
    Inventor: David Kovac
  • Publication number: 20150022264
    Abstract: A circuit includes a plurality of transistors responsive to a plurality of latches that store a test code. The circuit further includes a first bit line coupled to a data cell and coupled to a sense amplifier. The circuit also includes a second bit line coupled to a reference cell and coupled to the sense amplifier. A current from a set of the plurality of transistors is applied to the data cell via the first bit line. The set of the plurality of transistors is determined based on the test code. The circuit also includes a test mode reference circuit coupled to the first bit line and to the second bit line.
    Type: Application
    Filed: July 22, 2013
    Publication date: January 22, 2015
    Applicant: QUALCOMM Incorporated
    Inventors: Jung Pill Kim, Taehyun Kim, Sungryul Kim, Daeik D. Kim
  • Publication number: 20150002220
    Abstract: The exemplary embodiments include methods, computer readable media, and devices for calibrating a non-linear power detector of a radio frequency device based upon measurements of the non-linear power detector output and the associated power amplifier output level, and a set of data points that characterize a nominal non-linear power detector. The set of data points that characterize the nominal non-linear power detector is stored in a calibration system memory as nominal power detector output data. The measured non-linear power detector outputs, power amplifier output levels, and the nominal power detector output data is used to determine a power detector error function that characterizes the difference between the response of the non-linear power detector and the nominal non-linear power detector. The power detector error function and the nominal power detector output data are used to develop a calibrated power detector output data set that is stored in the non-linear power detector.
    Type: Application
    Filed: September 16, 2014
    Publication date: January 1, 2015
    Inventors: Alexander Wayne Hietala, Timothy E. Daughters
  • Publication number: 20140327480
    Abstract: A system and method for adjusting a common mode output voltage in an instrumentation amplifier is provided. In one aspect, the common mode output voltage is increased or decreased with respect to the common mode input voltage to enable high amplification of the signal input to the instrumentation amplifier. Moreover, the common mode output voltage can be driven to (or approximately to) a target voltage value such as, but not limited to, half the supply, even if the common mode input voltage is close to supply or ground rail voltage. Thus, a high amplification of the differential input voltage can be obtained and utilized for various applications requiring rail to rail input.
    Type: Application
    Filed: July 16, 2014
    Publication date: November 6, 2014
    Inventors: Olivier Nys, Francois Krummenacher
  • Patent number: 8866549
    Abstract: The exemplary embodiments include methods, computer readable media, and devices for calibrating a non-linear power detector of a radio frequency device based upon measurements of the non-linear power detector output and the associated power amplifier output level, and a set of data points that characterize a nominal non-linear power detector. The set of data points that characterize the nominal non-linear power detector is stored in a calibration system memory as nominal power detector output data. The measured non-linear power detector outputs, power amplifier output levels, and the nominal power detector output data is used to determine a power detector error function that characterizes the difference between the response of the non-linear power detector and the nominal non-linear power detector. The power detector error function and the nominal power detector output data are used to develop a calibrated power detector output data set that is stored in the non-linear power detector.
    Type: Grant
    Filed: June 1, 2011
    Date of Patent: October 21, 2014
    Assignee: RF Micro Devices, Inc.
    Inventors: Alexander Wayne Hietala, Timothy E. Daughters
  • Publication number: 20140301570
    Abstract: An emergency message output amplifier includes a plurality of audio output channels. Channels can be combined together to increase output power, and can be isolated from respective output speakers in response to detected faults and then disabled. The functional amplifier can be activated by itself and output current can be monitored to lower the output level enough to enable the amplifier to properly drive the existing load.
    Type: Application
    Filed: April 9, 2013
    Publication date: October 9, 2014
    Inventors: Christrohm Robert Shawn Morriss, Sacho Petkov Parvanov
  • Patent number: 8847677
    Abstract: According to one embodiment, an amplification circuit can be switched between amplifying and calibration modes. During calibration, a preamplifier amplifies a differential input signal and generates a differential output signal. The amplifier circuit includes an input switch unit which sets a differential input signal as the reference voltage signal of the same voltage level at the time of calibration, a PWM conversion unit which carries out Pulse-Width-Modulation of the differential output signal, and generates a differential PWM signal based on the result of comparing the differential output signal with the reference signal, a calibration unit which generates an offset adjustment signal according to the phase difference of differential PWM signals, and an electric amplifier which carries out electric power amplification of the differential PWM signal and generates the differential final output signal.
    Type: Grant
    Filed: September 7, 2012
    Date of Patent: September 30, 2014
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Yoshikazu Nagashima
  • Publication number: 20140194080
    Abstract: A method includes setting a circuit to a mode. A test tone having a first frequency is provided to the circuit for use in calibrating the circuit. A received signal is generated based on an output signal of the circuit, the received signal including a component having a second frequency that is a harmonic of the first frequency. A magnitude of the component having the second frequency in the received signal is measured. A delay of the circuit corresponding to the mode is adjusted according to the magnitude of the component.
    Type: Application
    Filed: December 20, 2013
    Publication date: July 10, 2014
    Inventors: Qiang LI, Brian T. BRUNN
  • Patent number: 8774258
    Abstract: A PAPR determining device includes a detecting unit and a PAPR determining unit. The detecting unit detects a predetermined value's changes, which is a cause of changes in a saturation power of a power amplifier. When the detecting unit detects any change in the predetermined value, the PAPR determining unit determines a PAPR value that corresponds to the saturation power of the power amplifier.
    Type: Grant
    Filed: April 3, 2012
    Date of Patent: July 8, 2014
    Assignee: Fujitsu Limited
    Inventor: Tsuneaki Tadano