With Amplifier Condition Indicating Or Testing Means Patents (Class 330/2)
  • Patent number: 7783062
    Abstract: Disclosed is an automatic audio distortion control method and apparatus, wherein the automatic audio distortion control apparatus comprises an amplifier (6) and a feedback loop which has its both ends coupled to an input and an output of the amplifier (6), wherein said feedback loop has clipping distortion of signals outputted from the amplifier (6) as a control parameter for automatic control on the distortion of the amplifier (6). Once the outputted level gets close to a limit-value of speakers, the method and the apparatus will regulate power amplifier gain automatically, in order to control distortion, prevent damage to the speakers, and provide compatibility with high or low levels inputted from various audio sources.
    Type: Grant
    Filed: September 8, 2005
    Date of Patent: August 24, 2010
    Assignee: Beijing Edifier Technology Co., Ltd.
    Inventor: Min Xiao
  • Patent number: 7772922
    Abstract: A method and apparatus for testing a data signal amplifier having an output signal power dependent upon multiple signal power control parameters, e.g., signal gain control and amplifier bias current control.
    Type: Grant
    Filed: April 16, 2009
    Date of Patent: August 10, 2010
    Assignee: LitePoint Corporation
    Inventors: Christian Volf Olgaard, Wassim El-Hassan, Carsten Andersen
  • Patent number: 7772923
    Abstract: A test circuit, for checking whether at least one programmable gain amplifier (PGA) operates correctly, includes a signal generator, a gain controller, a test level output circuit, a comparison circuit and an identifying circuit. The signal generator is utilized for outputting a test input signal to a PGA to generate a test output signal. The gain controller is utilized for outputting a gain control signal to the PGA to adjust a gain of the PGA. The test level output circuit is utilized for referring to the test output signal to output a first test level and a second test level. The comparison circuit is utilized for comparing the first and second test levels to generate a result signal. The identifying circuit is utilized for identifying whether the PGA operates correctly according to the result signal.
    Type: Grant
    Filed: May 12, 2009
    Date of Patent: August 10, 2010
    Assignee: Realtek Semiconductor Corp.
    Inventors: Po-Chiang Wu, Chia-Liang Chiang, Sheng-Nan Chiu, Chung-Ting Yang, Ying-Chuan Peng
  • Publication number: 20100182299
    Abstract: A semiconductor integrated circuit is disclosed which includes: a first D/A converter; a second D/A converter; an amplifier configured to amplify an output of the first D/A converter; an operational amplifier configured to input an output of the second D/A converter; and a selector configured to effect switchover between a normal mode and a test mode, the normal mode being a mode in which the operational amplifier is caused to function as an amplifier for amplifying the output of the second D/A converter, the test mode being a mode in which the operational amplifier is caused to function as a comparator for comparing the output of the second D/A converter with the output of the first D/A converter.
    Type: Application
    Filed: December 3, 2009
    Publication date: July 22, 2010
    Applicant: Sony Corporation
    Inventors: Kenji Hyoudou, Takashi Ichirizuka, Takuya Kimoto, Minoru Togo
  • Publication number: 20100148860
    Abstract: The invention provides a method and apparatus for applying test signals to a multiport amplifier (MPA) and a method, apparatus and system for determining parameter adjustments for an MPA. Applying test signals to an MPA is performed so as to provide an output signal indicative of parameter adjustments for the MPA, the multiport amplifier arrangement comprising an input network, an amplifier unit and an output network, where the method includes providing a test signal directly to a point in the multiport amplifier arrangement between an output of the input network and an input of the amplifier unit.
    Type: Application
    Filed: February 26, 2009
    Publication date: June 17, 2010
    Applicant: ASTRIUM LIMITED
    Inventors: Geoffrey Philip Rhodes, Michael Harverson
  • Publication number: 20100127771
    Abstract: The disclosure provides a driving circuit including a testing function including: an amplification circuit that amplifies an input signal and that outputs an amplified signal from an output terminal to one of a pair of input terminals of an electric device; an inversion circuit that inverts the amplified signal and that outputs an inverted signal from an output terminal to the other input terminal of the electric device; and a switching circuit that, when testing the electric device, puts the amplification circuit and the inversion circuit into a non-operating state and that switches to connect one of the output terminal of the amplification circuit or the output terminal of the inversion circuit to a first potential, and to connect the other output terminal of the amplification circuit and the output terminal of the inversion circuit to a second potential which is lower than the first electric potential.
    Type: Application
    Filed: November 24, 2009
    Publication date: May 27, 2010
    Inventor: Yuuichi SEKIYA
  • Publication number: 20100045370
    Abstract: Testing is performed on an amplifier wafer housing a transimpedance amplifier prior to packaging the transimpedance amplifier with an external photodetector, wherein the transimpedance amplifier includes a small, auxiliary, integrated silicon photodetector provided at the input of the transimpedance, in parallel with external photodetector attachment points. To test the transimpedance amplifier, the transimpedance amplifier is stimulated by optically exciting the small auxiliary photodetector, wherein the small auxiliary photodetector is excited using short wavelength light, whereby advantages such as higher efficiency may be obtained. The testing method includes placing the amplifier wafer in a testing system, probing the power and ground connections on the amplifier wafer, illuminating the small auxiliary photodetector on the amplifier wafer, and detecting the output of the transimpedance amplifier housed on the amplifier wafer.
    Type: Application
    Filed: August 21, 2009
    Publication date: February 25, 2010
    Applicant: International Business Machines Corporation
    Inventors: John Andrew Guckenberger, Young Hoon Kwark, Jeremy Daniel Schaub
  • Publication number: 20100026385
    Abstract: A calibration device for a power amplifier includes a calculation unit, a first storage unit and a multiplier. The calculation unit is utilized for generating a calibration factor according to a value of a characteristic parameter of the power amplifier. The first storage unit coupled to the calculation unit, for storing the calibration factor. The multiplier is coupled to the first storage unit and a baseband unit, for multiplying a baseband signal outputted from the baseband unit by the calibration factor for generating an input signal to the power amplifier.
    Type: Application
    Filed: May 13, 2009
    Publication date: February 4, 2010
    Inventors: Chun-Hsien Wen, Yun-Shen Chang, Wen-Sheng Hou, Chien-Cheng Lin, Jiunn-Tsair Chen
  • Patent number: 7642845
    Abstract: Systems and method for tracking different types of transconductance cells is shown and described. In these multi-cell systems, the addition of one or more tracking control modules allows circuit designers to advantageously incorporate multiple transconductor topologies and their uniquely beneficial characteristics into their designs, without eradicating its centralized multi-cell tuning functionality.
    Type: Grant
    Filed: August 24, 2006
    Date of Patent: January 5, 2010
    Assignee: Cypress Semiconductor Corporation
    Inventors: Mark R. Gehring, Joseph Stenger
  • Patent number: 7639082
    Abstract: A system and method for amplifier gain measurement and compensation. A method for compensating a signal gain of an amplifier circuit includes determining a desired gain for the amplifier circuit, determining an operating temperature of the amplifier circuit, adjusting a set of signal gains based on the operating temperature to produce a set of adjusted signal gains, determining a desired gain setting based on the desired gain and the set of signal gains, and providing the desired gain setting to the amplifier circuit.
    Type: Grant
    Filed: August 30, 2007
    Date of Patent: December 29, 2009
    Assignee: Texas Instruments Incorporated
    Inventors: Khurram Muhammad, Dirk Leipold, Chandana Fernando
  • Patent number: 7639077
    Abstract: Iterative pre-conditioning of an electrical signal for supply to an amplifier, comprising: a first pre-conditioning iteration comprising limiting the amplitude of the electrical signal to produce a limited signal; generating a difference signal for subtracting the electrical signal from the limited signal; and generating an output signal by subtracting the difference signal from the limited signal; at least one further iteration comprising the steps of: Limiting the amplitude of the output signal of the previous iteration to produce a subsequent limited signal; generating a subsequent difference signal by subtracting the electrical signal from the subsequent limited signal; and generating an output signal by subtracting the subsequent difference signal from the subsequent limited signal.
    Type: Grant
    Filed: September 8, 2005
    Date of Patent: December 29, 2009
    Assignee: Filtronic PLC
    Inventor: Nicholas Archer
  • Patent number: 7639072
    Abstract: Methods and systems for vector combining power amplification are disclosed herein. In one embodiment, a plurality of signals are individually amplified, then summed to form a desired time-varying complex envelope signal. Phase and/or frequency characteristics of one or more of the signals are controlled to provide the desired phase, frequency, and/or amplitude characteristics of the desired time-varying complex envelope signal. In another embodiment, a time-varying complex envelope signal is decomposed into a plurality of constant envelope constituent signals. The constituent signals are amplified equally or substantially equally, and then summed to construct an amplified version of the original time-varying envelope signal. Embodiments also perform frequency up-conversion.
    Type: Grant
    Filed: December 12, 2006
    Date of Patent: December 29, 2009
    Assignee: ParkerVision, Inc.
    Inventors: David F. Sorrells, Gregory S. Rawlins, Michael W. Rawlins
  • Patent number: 7636013
    Abstract: An integrated circuit including a circuit for calibration and offset compensation of an amplifier method is disclosed. In one embodiment, the method includes providing a reference input signal to the input of an amplifier, coupling the output signal of the amplifier to a comparator circuit as a first input signal, providing a target signal to the comparator circuit as a second input signal, and increasing or decreasing a control signal provided to amplifier VGA corresponding to the output of the comparator circuit by one adjustment process of small process size.
    Type: Grant
    Filed: July 25, 2007
    Date of Patent: December 22, 2009
    Assignee: Infineon Technologies AG
    Inventor: Elmar Bach
  • Publication number: 20090284312
    Abstract: A test circuit, for checking whether at least one programmable gain amplifier (PGA) operates correctly, includes a signal generator, a gain controller, a test level output circuit, a comparison circuit and an identifying circuit. The signal generator is utilized for outputting a test input signal to a PGA to generate a test output signal. The gain controller is utilized for outputting a gain control signal to the PGA to adjust a gain of the PGA. The test level output circuit is utilized for referring to the test output signal to output a first test level and a second test level. The comparison circuit is utilized for comparing the first and second test levels to generate a result signal. The identifying circuit is utilized for identifying whether the PGA operates correctly according to the result signal.
    Type: Application
    Filed: May 12, 2009
    Publication date: November 19, 2009
    Inventors: Po-Chiang Wu, Chia-Liang Chiang, Sheng-Nan Chiu, Chung-Ting Yang, Ying-Chuan Peng
  • Publication number: 20090261899
    Abstract: Embodiments of the present invention provide systems and methods for automatic amplifier gain profile control, including a method for automatically configuring a variable gain profile amplifier according to received input and a variable gain profile amplification system. Further, embodiments of the present invention provide systems and methods for increased gain profile accuracy, including methods and systems to reduce the effects of temperature and/or process variations on the gain profile of an amplifier.
    Type: Application
    Filed: July 14, 2008
    Publication date: October 22, 2009
    Applicant: Broadcom Corporation
    Inventors: Ramon Gomez, Jianhong Xiao, Takayuki Hayashi
  • Patent number: 7606322
    Abstract: A linearizer and method. In a most general embodiment, the inventive linearizer includes a characterizer coupled to an input to and an output from said circuit for generating a set of coefficients and a predistortion engine responsive to said coefficients for predistorting a signal input to said circuit such that said circuit generates a linearized output in response thereto. In a specific application, the circuit is a power amplifier into which a series of pulses are sent during an linearizer initialization mode of operation. In a specific implementation, the characterizer analyzes finite impulse responses of the amplifier in response to the initialization pulses and calculates the coefficients for the feedback compensation filter in response thereto. In the preferred embodiment, the impulse responses are averaged with respect to a threshold to provide combined responses. In the illustrative embodiment, the combined responses are Fast Fourier Transformed, reciprocated and then inverse transformed.
    Type: Grant
    Filed: June 9, 2005
    Date of Patent: October 20, 2009
    Assignee: Microelectronics Technology Inc.
    Inventors: Khiem V. Cai, David B. Rutan, Matthew S. Gorder, Don C. Devendorf
  • Patent number: 7606324
    Abstract: A system, method and computer program product for stabilizing a coefficient set used by a digital predistortion (DPD) engine to apply pre-distortion to a transmit signal and cancel distortion generated by a distorting element or distorting system when transmitting the transmit signal, including obtaining an initial coefficient set; rotating the initial coefficient set to maintain a phase of fundamental components (w10(t), . . . , w1Q(t)) of the initial coefficient set a constant value; averaging the rotated coefficient set to obtain an averaged coefficient set; and applying the averaged coefficient set to the DPD engine.
    Type: Grant
    Filed: December 5, 2007
    Date of Patent: October 20, 2009
    Assignee: Microelectronics Technology Inc.
    Inventors: Khiem V. Cai, David B. Rutan, Matthew S. Gorder, Don C. Devendorf
  • Publication number: 20090256630
    Abstract: A method of power amplifier predistortion that makes use of a compression detector circuit in a feedback loop in order to adapt the channel gain for changing transmitter behavior. By monitoring the compression behavior of the amplifier, the signal is scaled to compensate for gain and compression point variations in the power amplifier and transmitter, while keeping a predistortion correction function constant.
    Type: Application
    Filed: April 11, 2008
    Publication date: October 15, 2009
    Inventor: Michael Lee Brobston
  • Patent number: 7599418
    Abstract: A method and system for generating a frequency hopping electromagnetic signal based on a baseband data signal includes a frequency hopping pre-compensator. The frequency hopping pre-compensator determines a frequency hopping pre-compensation signal based on a desired frequency hopping sequence. The frequency hopping pre-compensation signal is combined with the baseband data signal to generate a pre-compensated baseband signal. An RF modulator modulates an RF carrier in accordance with the pre-compensated baseband signal to generate a modulated, frequency hopping RF carrier signal. An amplifier may then amplify the RF carrier signal as desired.
    Type: Grant
    Filed: February 16, 2006
    Date of Patent: October 6, 2009
    Assignee: Pine Valley Investments, Inc.
    Inventor: Walid Khairy Mohamed Ahmed
  • Publication number: 20090224824
    Abstract: Systems and methods for characterizing amplifiers. A system for characterizing an amplifier in accordance with the present invention comprises a Gaussian signal source for generating a signal in the frequency domain, a notch filter, coupled to the Gaussian Noise source, wherein the notch filter has a notch at a specified frequency and a frequency bandwidth, the frequency bandwidth encompassing the specified frequency, an Inverse Fast Fourier Transform device, coupled to an output of the notch filter, a normalization device, coupled to the Inverse Fast Fourier Transform device, an amplifier under test, coupled to the normalization device, for amplifying the signal generated by the Gaussian signal source, and a measurement device, coupled to an output of the amplifier, for measuring a power output of the amplifier in the frequency bandwidth and a noise output at the specified notch frequency, and for calculating the ratio between the power output and the noise output.
    Type: Application
    Filed: April 9, 2009
    Publication date: September 10, 2009
    Applicant: The DIRECTV Group, Inc.
    Inventors: Guangcai Zhou, Tung-Sheng Lin, Dennis Lai, Joseph Santoru, Ernest C. Chen, Shamik Maitra, Cecilia Comeaux
  • Publication number: 20090167429
    Abstract: One embodiment relates to an on-chip power amplifier (PA) test circuit. In one embodiment, a PA test circuit comprises a controllable oscillator (CO) configured to generate a radio frequency (RF) signal, a parallel resonant circuit tuned to the radio frequency, a pre-power amplifier (PPA) coupled to the CO and the parallel resonant circuit, the PPA configured to amplify and drive the RF signal from an output of the PPA into a load. The test circuit may further comprise a first transmission gate configured to couple the RF signal from the CO to an input of the PPA. One testing methodology for a PA test circuit comprises stressing the PPA with an RF signal, measuring a characteristic of the PPA, determining stress degradation from the characteristic measurements, and repeating the stressing and characteristic measurements until a maximum stress degradation is achieved or a maximum stress has been applied.
    Type: Application
    Filed: January 11, 2008
    Publication date: July 2, 2009
    Applicant: Texas Instruments Incorporated
    Inventors: Vijay Kumar Reddy, Andrew Marshall, Siraj Akhtar, Srikanth Krishnan, Karan Singh Bhatia
  • Patent number: 7545156
    Abstract: The test circuit according to the present invention includes: a plurality of light-receiving elements; a plurality of amplifiers, each of which converts, into a voltage, a photoelectric current supplied from one of the light-receiving elements; and an electric current supplying unit which supplies an electric current to each of the light-receiving elements and each of the amplifiers.
    Type: Grant
    Filed: February 21, 2007
    Date of Patent: June 9, 2009
    Assignee: Panasonic Corporation
    Inventors: Yousuke Kuroiwa, Hideo Fukuda, Hiroshi Yamaguchi, Tetsuo Chato, Yuzo Shimizu, Masaki Taniguchi
  • Patent number: 7545206
    Abstract: An apparatus for biasing a transistor, comprising: a controllable bias generator; a test circuit; a digital Mth order differentiator responsive to an output of the test circuit; and a controller responsive to the digital Mth order differentiator for controlling the controllable bias generator; wherein the test circuit is configured to calculate an Lth order derivative of the transistor's performance.
    Type: Grant
    Filed: December 4, 2007
    Date of Patent: June 9, 2009
    Assignee: Media Tek Inc.
    Inventor: Jonathan Richard Strange
  • Patent number: 7535292
    Abstract: Systems and methods for characterizing amplifiers. A system for characterizing an amplifier in accordance with the present invention comprises a Gaussian signal source for generating a signal in the frequency domain, a notch filter, coupled to the Gaussian Noise source, wherein the notch filter has a notch at a specified frequency and a frequency bandwidth, the frequency bandwidth encompassing the specified frequency, an Inverse Fast Fourier Transform device, coupled to an output of the notch filter, a normalization device, coupled to the Inverse Fast Fourier Transform device, an amplifier under test, coupled to the normalization device, for amplifying the signal generated by the Gaussian signal source, and a measurement device, coupled to an output of the amplifier, for measuring a power output of the amplifier in the frequency bandwidth and a noise output at the specified notch frequency, and for calculating the ratio between the power output and the noise output.
    Type: Grant
    Filed: October 11, 2007
    Date of Patent: May 19, 2009
    Assignee: The DIRECTV Group, Inc.
    Inventors: Guangcai Zhou, Tung-Sheng Lin, Dennis Lai, Joseph Santoru, Ernest C. Chen, Shamik Maitra, Cecilia Comeaux
  • Patent number: 7529523
    Abstract: A method for calibrating the output power of a mobile terminal using at least a second order curve fit to describe a power amplifier gain (PAG) setting versus output power characteristic of a power amplifier in a transmitter of the mobile terminal is provided. For each of an upper-band frequency, a mid-band frequency, and a lower-band frequency of a frequency band, multiple measurements of the output power of the mobile terminal are made corresponding to multiple values of the PAG setting, and a curve fit is performed, thereby calculating coefficients defining a polynomial describing the PAG setting versus output power characteristic. Using the polynomials describing the PAG setting versus output power characteristic of the power amplifier for each of the upper-band, mid-band, and lower-band frequencies, values of the PAG setting are determined for each desired output power level for each desired frequency within the frequency band.
    Type: Grant
    Filed: August 23, 2005
    Date of Patent: May 5, 2009
    Assignee: RF Micro Devices, Inc.
    Inventors: Jason Young, Dennis Mahoney, Ricke W. Clark, Nadim Khlat, Adam Toner
  • Patent number: 7528649
    Abstract: A circuit having: an input matching network; a transistor coupled to an output of the input matching network; and wherein the input matching network has a first input impedance when such input matching network is fed with an input signal having a relatively low power level and wherein the input matching network has an input impedance different from the first input impedance when such input matching network is fed with an input signal having a relatively high power level.
    Type: Grant
    Filed: September 7, 2007
    Date of Patent: May 5, 2009
    Assignee: Raytheon Company
    Inventors: Colin S. Whelan, Raghu Mallavarpu, Matthew C. Tyhach
  • Patent number: 7521936
    Abstract: A power converter system that includes a diagnostic system is presented. One example of a power converter system is an audio amplifier system, such as a switch mode amplifier. The diagnostic system in the power converter may collect data indicative of signals in the power converter system and analyze the collected data. The collection and analysis of the data may be user defined (such as multiple measurements taken over a predetermined period) or may be defined by operation of the power converter system (such as an overcurrent or voltage clipping in the power converter system). The analysis of the collected data may be used to determine one or more potential problems in the power converter system, and to modify operation of the power converter system.
    Type: Grant
    Filed: December 5, 2006
    Date of Patent: April 21, 2009
    Assignee: Harman International Industries, Incorporated
    Inventor: Gerald R. Stanley
  • Publication number: 20090091381
    Abstract: The present invention aims to suppress degradation of a reception characteristic even in such an environment that the signal strength of an inputted analog signal varies due to a variation in a received electric field. A controller acquires characteristic information showing each gain characteristic indicative of a relationship between the signal strength of the analog signal and the gain corresponding to the analog signal at an amplifier from a CPU. An AGC controller derives gains each corresponding to the signal strength detected at an ADC according to the gain characteristics indicated by the acquired characteristic information, whenever necessary, and outputs the same to the amplifier through a terminal.
    Type: Application
    Filed: September 24, 2008
    Publication date: April 9, 2009
    Applicant: OKI ELECTRIC INDUSTRY CO., LTD.
    Inventor: Shigeru Amano
  • Publication number: 20090066411
    Abstract: A circuit having: an input matching network; a transistor coupled to an output of the input matching network; and wherein the input matching network has a first input impedance when such input matching network is fed with an input signal having a relatively low power level and wherein the input matching network has an input impedance different from the first input impedance when such input matching network is fed with an input signal having a relatively high power level.
    Type: Application
    Filed: September 7, 2007
    Publication date: March 12, 2009
    Inventors: Colin S. Whelan, Raghu Mallavarpu, Matthew C. Tyhach
  • Publication number: 20090051461
    Abstract: A output power detecting system with a directional coupler has a directional coupler at the output terminal of the output power detecting system. The directional coupler includes a main line, a first sub line, and a second sub line. The output of the power amplifying unit is fully coupled to a power detecting unit via the coupling between the main line and the first sub line, and the external noise is coupled to the ground via the coupling between the first sub line and the second sub line. Therefore, the power detecting unit accurately detects the output power of the output power detecting system.
    Type: Application
    Filed: August 21, 2007
    Publication date: February 26, 2009
    Applicant: AZUREWAVE TECHNOLOGIES, INC.
    Inventors: CHUNG-ER HUANG, HUANG-CHAN CHIEN
  • Patent number: 7489186
    Abstract: A current sense amplifier for a voltage converter wherein the voltage converter has at least one channel providing an output current through an output inductor, the current sense amplifier monitoring the current in the at least one channel through the output inductor, the current sense amplifier comprising a plurality of variable gain amplifiers, there being at least one more variable gain amplifier than channels in the voltage converter, whereby at least one variable gain amplifier is in a calibration mode for a preset period of time during which the variable gain amplifier is compensated for an offset error and the gain of the variable gain amplifier is calibrated to compensate for temperature of the output inductor, while during said preset period of time any remaining variable gain amplifiers are connected to monitor the channel current in each output inductor.
    Type: Grant
    Filed: January 11, 2007
    Date of Patent: February 10, 2009
    Assignee: International Rectifier Corporation
    Inventor: Daniel J. Segarra
  • Publication number: 20090033412
    Abstract: An apparatus is provided for remotely monitoring a plurality of amplifiers on a display device. The amplifiers are provided to process audio signals and directly or indirectly connected to a network. In the apparatus, a collecting section collects a group code from each of the amplifiers through the network. The group code is allocated to each amplifier according to a grouping system for grouping the plurality of the amplifiers. A display control section displays a tree diagram of the amplifiers according to the collected group codes on the display device as a graphical representation of the grouping system.
    Type: Application
    Filed: July 31, 2008
    Publication date: February 5, 2009
    Applicant: Yamaha Corporation
    Inventors: Akio SUYAMA, Takaaki Muto, Naohide Kohyama, Ken Iwayama
  • Patent number: 7486067
    Abstract: A measurement system for determining at least one characteristic of a device under test (DUT) at at least one frequency is described. The measurement system includes a network analyzer being in connection at least with a first source via a first connector and a second source via a second connector. Each source generates a signal. The network analyzer further includes signal paths arranged for applying the generated signals to the DUT and arranged for receiving signals output by the DUT. The frequency content of the signal generated by the second source includes at least a frequency component offset from the at least one frequency at which the DUT is characterized, the at least one frequency being included in the frequency content of the signal generated by the first source.
    Type: Grant
    Filed: December 7, 2006
    Date of Patent: February 3, 2009
    Assignee: NMDG NV
    Inventor: Marc Vanden Bossche
  • Publication number: 20090027116
    Abstract: An integrated circuit including a circuit for calibration and offset compensation of an amplifier method is disclosed. In one embodiment, the method includes providing a reference input signal to the input of an amplifier, coupling the output signal of the amplifier to a comparator circuit as a first input signal, providing a target signal to the comparator circuit as a second input signal, and increasing or decreasing a control signal provided to amplifier VGA corresponding to the output of the comparator circuit by one adjustment process of small process size.
    Type: Application
    Filed: July 25, 2007
    Publication date: January 29, 2009
    Applicant: INFINEON TECHNOLOGIES AG
    Inventor: Elmar Bach
  • Publication number: 20090021300
    Abstract: An apparatus for detecting output power from an amplifier (103) comprises a first controller (105) for controlling output power of a signal from the amplifier (103), a device (107) for measuring dc bias current/voltage at an output (115) of the amplifier (103), second controller (109) operative to set the first controller (105) to a setting corresponding to an output power at a finite level, and a detector (109) for determining whether or not there is output power from the amplifier based on the measured dc bias current/voltage at the setting of the first controller (105). In one embodiment, the first controller (105) is set at a setting corresponding to an output power level which is sufficient to at least partially saturate the amplifier (103).
    Type: Application
    Filed: February 26, 2007
    Publication date: January 22, 2009
    Inventor: Antonio Romano
  • Publication number: 20080309405
    Abstract: The present invention is directed to systems and methods for reducing the distortion of power amplifiers. In particular, methods and systems are described that enable a determination of a pre-distortion correction signal to be determined, which when added to the nominal signal, a reduction in the distortion of the power amplifier results. In addition, methods and systems are described that enable calibration of individual power amplifiers to be accomplished for use with the above described approach. More specifically, the methods and systems are described for use in a MIMO application. These approaches may be applied to on-chip power amplifiers, off-chip power amplifiers, or any combination thereof.
    Type: Application
    Filed: June 16, 2008
    Publication date: December 18, 2008
    Applicant: Broadcom Corporation
    Inventors: Christopher YOUNG, Elias Simpson
  • Publication number: 20080280575
    Abstract: The present invention relates to transmitter emission control. An apparatus is provided with a power amplifier and a power control part operatively connected to the power amplifier. The power control part is configured to receive an indication of a spectrum mask requirement and control supply power of the power amplifier on the basis of the indication of the spectrum mask requirement.
    Type: Application
    Filed: August 30, 2007
    Publication date: November 13, 2008
    Inventor: Mikko Pesola
  • Patent number: 7436253
    Abstract: Methods and systems for fast calibration to cancel phase feedthrough are disclosed and may comprise individually activating each of n binary-weighted cells utilizing a control signal in a power amplifier driver (PAD) and measuring the output signal, or offset, in response to a null signal applied to an input of each binary-weighted cell. This offset may be fed back, summed, and adjusted until the measured PAD output may be minimized. This calibrated offset may cancel phase feedthrough of the PAD, and the calibrated offset for each binary-weighted cell may be stored in a lookup table. The control signal may also be utilized for controlling the output power of the PAD by activating appropriate binary-weighted cells. For each of the 2n output powers, a calibrated offset is calculated utilizing a weighted sum of the stored offsets for the activated binary-weighted cells.
    Type: Grant
    Filed: December 27, 2006
    Date of Patent: October 14, 2008
    Assignee: Broadcom Corporation
    Inventor: Alireza Zolfaghari
  • Publication number: 20080224767
    Abstract: A semiconductor integrated circuit has an amplifier circuit which includes a phase compensating capacitor and has a feedback loop, and a stability determining and adjusting circuit which measures an amplitude of a voltage outputted from the amplifier circuit at a predetermined plurality of frequencies and adjusts a capacitance value of the phase compensating capacitor on the basis of a ratio between measured values of the amplitude.
    Type: Application
    Filed: March 13, 2008
    Publication date: September 18, 2008
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventor: Kenichi Agawa
  • Patent number: 7423477
    Abstract: Methods and systems for vector combining power amplification are disclosed herein. In one embodiment, a plurality of signals are individually amplified, then summed to form a desired time-varying complex envelope signal. Phase and/or frequency characteristics of one or more of the signals are controlled to provide the desired phase, frequency, and/or amplitude characteristics of the desired time-varying complex envelope signal. In another embodiment, a time-varying complex envelope signal is decomposed into a plurality of constant envelope constituent signals. The constituent signals are amplified equally or substantially equally, and then summed to construct an amplified version of the original time-varying envelope signal. Embodiments also perform frequency up-conversion.
    Type: Grant
    Filed: January 29, 2007
    Date of Patent: September 9, 2008
    Assignee: ParkerVision, Inc.
    Inventors: David F. Sorrells, Gregory S. Rawlins, Michael W. Rawlins
  • Patent number: 7417394
    Abstract: The invention concerns a device for controlling a final power-output stage, the latter comprising three half-bridges consisting respectively of a series circuit including an upper semiconductor switch and a lower semiconductor switch and subjected to a service voltage, the connection points of the semiconductor switches of the half-bridges forming outputs which are connected to the windings of a motor having at least three phases. The invention is characterized in that there is provided a control device for shifting on-state respectively one semiconductor switch or simultaneously several semiconductor switches according to a predetermined programme and for determining whether the respective voltages at the outputs are respectively within a predetermined tolerance range for the corresponding switching state.
    Type: Grant
    Filed: November 9, 2004
    Date of Patent: August 26, 2008
    Assignee: Siemens Aktiengesellschaft
    Inventors: Wolfgang Bay, Michael Henninger
  • Patent number: 7414469
    Abstract: Methods and systems for vector combining power amplification are disclosed herein. In one embodiment, a plurality of signals are individually amplified, then summed to form a desired time-varying complex envelope signal. Phase and/or frequency characteristics of one or more of the signals are controlled to provide the desired phase, frequency, and/or amplitude characteristics of the desired time-varying complex envelope signal. In another embodiment, a time-varying complex envelope signal is decomposed into a plurality of constant envelope constituent signals. The constituent signals are amplified equally or substantially equally, and then summed to construct an amplified version of the original time-varying envelope signal. Embodiments also perform frequency up-conversion.
    Type: Grant
    Filed: January 29, 2007
    Date of Patent: August 19, 2008
    Assignee: ParkerVision, Inc.
    Inventors: David F Sorrells, Gregory S. Rawlins, Michael W. Rawlins
  • Patent number: 7392021
    Abstract: Apparatus, system, and method including a circuit including an element having an electrical impedance, an input node to receive a signal, and an output node to couple to a load; a sensing circuit coupled to the input node and the output node to sense a differential voltage between the input and output nodes and to sense a detected voltage at the input node; and a multiplier circuit to receive the differential voltage and to receive the detected voltage. The multiplier circuit provides an output voltage proportional to the instantaneous power delivered to the load based on the differential voltage, the detected voltage, and the impedance of the element. A system may further include a radio frequency (RF) power amplifier (PA). A method may further include controlling a gain of the RF PA to maintain the power delivered to the load at a predetermined level based on the output voltage of the multiplier circuit.
    Type: Grant
    Filed: August 3, 2005
    Date of Patent: June 24, 2008
    Assignee: M/A-Com, Inc.
    Inventors: Nitin Jain, Rajanish, Angelos Alexanian
  • Publication number: 20080136511
    Abstract: Methods and systems for fast calibration to cancel phase feedthrough are disclosed and may comprise individually activating each of n binary-weighted cells utilizing a control signal in a power amplifier driver (PAD) and measuring the output signal, or offset, in response to a null signal applied to an input of each binary-weighted cell. This offset may be fed back, summed, and adjusted until the measured PAD output may be minimized. This calibrated offset may cancel phase feedthrough of the PAD, and the calibrated offset for each binary-weighted cell may be stored in a lookup table. The control signal may also be utilized for controlling the output power of the PAD by activating appropriate binary-weighted cells. For each of the 2n output powers, a calibrated offset is calculated utilizing a weighted sum of the stored offsets for the activated binary-weighted cells.
    Type: Application
    Filed: December 27, 2006
    Publication date: June 12, 2008
    Inventor: Alireza Zolfaghari
  • Publication number: 20080129374
    Abstract: Systems and methods for characterizing amplifiers. A system for characterizing an amplifier in accordance with the present invention comprises a Gaussian signal source for generating a signal in the frequency domain, a notch filter, coupled to the Gaussian Noise source, wherein the notch filter has a notch at a specified frequency and a frequency bandwidth, the frequency bandwidth encompassing the specified frequency, an Inverse Fast Fourier Transform device, coupled to an output of the notch filter, a normalization device, coupled to the Inverse Fast Fourier Transform device, an amplifier under test, coupled to the normalization device, for amplifying the signal generated by the Gaussian signal source, and a measurement device, coupled to an output of the amplifier, for measuring a power output of the amplifier in the frequency bandwidth and a noise output at the specified notch frequency, and for calculating the ratio between the power output and the noise output.
    Type: Application
    Filed: October 11, 2007
    Publication date: June 5, 2008
    Applicant: THE DIRECTV GROUP, INC.
    Inventors: Guangcai Zhou, Tung-Sheng Lin, Dennis Lai, Joseph Santoru, Ernest C. Chen, Shamik Maitra, Cecilia Comeaux
  • Patent number: 7383145
    Abstract: A circuit for regulating power is disclosed. The present invention provides circuits and methods for current sensing variations, static droop settings, mismatched phase outputs, and temperature variations in a multiphase power regulator. The circuits may include a calibration controller that senses and regulates both a current sensing circuit and the droop in a power regulator over a range of temperatures thus equalizing phase outputs. The present invention includes the schematic organization and implementation of the circuit, the circuit's calibration, its use, and implementation. This invention advantageously provides circuits and methods to properly power a processor or IC chip according to the unique power specifications of the processor or chip.
    Type: Grant
    Filed: February 8, 2006
    Date of Patent: June 3, 2008
    Assignee: NuPower Semiconductor, Inc.
    Inventors: Fereydun Tabaian, Hamed Sadati, Ali Hejazi, Ahmad Ashrafzadeh
  • Patent number: 7382182
    Abstract: A system for reducing the calibration time of a Power Amplifier (PA) (202) is provided. The system includes a memory module (304) that is integrated in the PA. The memory module is configured to store one or more calibration parameters of the PA.
    Type: Grant
    Filed: June 29, 2005
    Date of Patent: June 3, 2008
    Assignee: Motorola, Inc.
    Inventors: Robert S. Trocke, Armin W. Klomsdorf
  • Patent number: 7378902
    Abstract: Methods and systems for vector combining power amplification are disclosed herein. In one embodiment, a plurality of signals are individually amplified, then summed to form a desired time-varying complex envelope signal. Phase and/or frequency characteristics of one or more of the signals are controlled to provide the desired phase, frequency, and/or amplitude characteristics of the desired time-varying complex envelope signal. In another embodiment, a time-varying complex envelope signal is decomposed into a plurality of constant envelope constituent signals. The constituent signals are amplified equally or substantially equally, and then summed to construct an amplified version of the original time-varying envelope signal. Embodiments also perform frequency up-conversion.
    Type: Grant
    Filed: January 29, 2007
    Date of Patent: May 27, 2008
    Assignee: ParkerVision, Inc
    Inventors: David F Sorrells, Gregory S. Rawlins, Michael W. Rawlins
  • Patent number: 7378906
    Abstract: A pre-distorter that compensates for amplitude and phase distortion created by an amplifier. During a training session, the amplifier is stimulated with input signals of pre-selected amplitude and phase at various temperatures and the amplifier output is captured and converted into data sets. Polynomials are then fitted to the data sets and inverses of the polynomials are determined. The coefficients of the inverse polynomials are then saved for each temperature. During operation, the amplifier temperature is predicted based on the amplifier input signal and the coefficients associated with the predicted temperature are selected to be applied to the input signal to compensate for amplitude and phase distortion caused by the amplifier.
    Type: Grant
    Filed: February 7, 2007
    Date of Patent: May 27, 2008
    Assignee: Agere Systems, Inc.
    Inventors: Mohammad Shafiul Mobin, Jeffrey H. Saunders, Lane A. Smith
  • Patent number: 7355470
    Abstract: Methods and systems for vector combining power amplification are disclosed herein. In one embodiment, a plurality of signals are individually amplified, then summed to form a desired time-varying complex envelope signal. Phase and/or frequency characteristics of one or more of the signals are controlled to provide the desired phase, frequency, and/or amplitude characteristics of the desired time-varying complex envelope signal. In another embodiment, a time-varying complex envelope signal is decomposed into a plurality of constant envelope constituent signals. The constituent signals are amplified equally or substantially equally, and then summed to construct an amplified version of the original time-varying envelope signal. Embodiments also perform frequency up-conversion.
    Type: Grant
    Filed: August 24, 2006
    Date of Patent: April 8, 2008
    Assignee: ParkerVision, Inc.
    Inventors: David F. Sorrells, Gregory S. Rawlins, Michael W. Rawlins