With Amplifier Condition Indicating Or Testing Means Patents (Class 330/2)
  • Patent number: 8760224
    Abstract: An amplifying circuit is provided and includes a signal processor, an edge detector, and a calibration controller. The signal processor transforms amplitude information of a first and second input signals into time domain to provide first and second output signals respectively. The edge detector detects a polarity of a voltage offset from a timing relationship of the first and second output signals. The calibration controller compensates the voltage offset according to a change of the detected polarity.
    Type: Grant
    Filed: January 20, 2012
    Date of Patent: June 24, 2014
    Assignee: Mediatek Inc.
    Inventor: Kuo-Hsin Chen
  • Publication number: 20140159808
    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: Application
    Filed: December 11, 2012
    Publication date: June 12, 2014
    Applicant: Alcatel-Lucent Canada Inc.
    Inventors: Igor Acimovic, Brian Racey
  • Patent number: 8749312
    Abstract: Techniques for optimizing a cascade gain device comprising at least two gain stages are disclosed. A first noise figure associated with the first gain stage is incrementally increased by a plurality of noise figure increments determined based, at least in part, on a minimum noise figure and a maximum noise figure associated with the first gain stage. At each of the plurality of noise figure increments, at least a gain value that corresponds to the noise figure increment is calculated. One of the plurality of noise figure increments and the corresponding gain value is selected as an optimum noise figure of the first gain stage and an optimum gain value of the first gain stage respectively. Parameters of an inter-stage matching network associated with the first gain stage are configured based on the optimum noise figure and the optimum gain of the first gain stage.
    Type: Grant
    Filed: April 18, 2012
    Date of Patent: June 10, 2014
    Assignee: QUALCOMM Incorporated
    Inventor: Celestino A. Corral
  • Publication number: 20140077872
    Abstract: A signal amplification circuit includes an input terminal; a first chopper modulation circuit; a first amplifier having an amplification circuit and a chopper demodulation circuit, a capacitance feedback circuit having a second chopper modulation circuit, a first switch constituting a voltage follower circuit with the amplification circuit; a second switch; a second amplifier to convert the differential output signal from the second output terminal into a single-end signal; and a filter to pass at least a predetermined frequency component of the chopping frequency from the single-end signal from the second amplifier to output an output signal of the signal amplification circuit.
    Type: Application
    Filed: September 4, 2013
    Publication date: March 20, 2014
    Applicant: RICOH COMPANY, LTD.
    Inventor: Takeshi Nagahisa
  • Publication number: 20140070881
    Abstract: Apparatus, systems, and fabrication methods are provided for biasing amplifier arrangements inside device packages to a target quiescent current. In one embodiment, an amplifier device has an output interface and includes an amplifier arrangement having an amplifier output and impedance matching circuitry coupled between the amplifier output and the output interface. A method for biasing the amplifier arrangement involves measuring or otherwise obtaining a voltage between the amplifier output and the output interface, determining an estimated quiescent current through the amplifier arrangement based on that voltage, and adjusting a bias voltage provided to the input of the amplifier arrangement based on a difference between the estimated quiescent current. In exemplary embodiments, the bias voltage is adjusted until the estimated quiescent current is substantially equal to a target quiescent current.
    Type: Application
    Filed: September 13, 2012
    Publication date: March 13, 2014
    Applicant: FREESCALE SEMICONDUCTOR, INC.
    Inventors: Justin N. Annes, Mario M. Bokatius, Paul R. Hart, Joseph Staudinger
  • Patent number: 8655292
    Abstract: A signal separating unit separates an input signal into a first branch signal and a second branch signal in such a manner that, as the amplitude of the input signal decreases, the amplitude of the first branch signal and the second branch signal decreases and the difference between a phase of the first branch signal and a phase of the second branch signal increases and, as the amplitude of the input signal increases, the amplitude of the first branch signal and the second branch signal increases and the difference between the phase of the first branch signal and the phase of the second branch signal decreases. An amplifier amplifies the first branch signal. Another amplifier amplifies the second branch signal. A combining unit combines signals that are output from the amplifiers together, thereby generating an output signal.
    Type: Grant
    Filed: December 16, 2011
    Date of Patent: February 18, 2014
    Assignee: Fujitsu Limited
    Inventor: Toshio Kawasaki
  • Publication number: 20130285740
    Abstract: There is disclosed a method of determining an AM-PM distortion measurement for an amplifier, the method comprising: generating a test waveform to be provided to the input of the amplifier; periodically puncturing the test waveform with a fixed-level reference signal to generate a modified test waveform which alternates between test periods in which a portion of the test waveform is present and reference periods in which the fixed-level reference signal is present; measuring the amplifier AM-PM distortion in a test period; measuring the phase difference between the input and the output of the amplifier in reference periods either side of the test period; estimating a phase error in the test period in dependence on phase differences measured in the reference periods; and estimating the true amplifier AM-PM distortion by removing the estimated phase error from the measured amplifier AM-PM distortion.
    Type: Application
    Filed: March 29, 2013
    Publication date: October 31, 2013
    Inventor: Nujira Limited
  • Patent number: 8502601
    Abstract: An integrated circuit comprising a Class-D amplifier for amplifying an input signal at an input terminal is disclosed. The Class-D amplifier is switchable between an operational mode, in which a comparator (4) is directly coupled to an output stage (5), and a test mode, in which the comparator (4) is coupled to the output stage (5) via a sampler (15) and the output stage (5) is coupled to the input terminal via a feedback network, whereby a digital representation of the input signal is available at an output of the sampler (15).
    Type: Grant
    Filed: July 25, 2012
    Date of Patent: August 6, 2013
    Assignee: NXP B.V.
    Inventors: Marco Berkhout, Lutsen Ludgerus Albertus Hendrikus
  • Publication number: 20130187709
    Abstract: An amplifying circuit is provided and includes a signal processor, an edge detector, and a calibration controller. The signal processor transforms amplitude information of a first and second input signals into time domain to provide first and second output signals respectively. The edge detector detects a polarity of a voltage offset from a timing relationship of the first and second output signals. The calibration controller compensates the voltage offset according to a change of the detected polarity.
    Type: Application
    Filed: January 20, 2012
    Publication date: July 25, 2013
    Applicant: MEDIATEK INC.
    Inventor: Kuo-Hsin CHEN
  • Patent number: 8447050
    Abstract: A thermal sensor at the output of a switching amplifier senses heat dissipation at the output switch. If an overheating condition is sensed, gain of the digital input signal is lowered to reduce output power of the audio output signal.
    Type: Grant
    Filed: October 21, 2010
    Date of Patent: May 21, 2013
    Assignee: Cirrus Logic, Inc.
    Inventors: John L. Melanson, Xiaofan Fei, Johann G. Gaboriau, Steven Green, Jason P. Rhode, Eric Walburger, Wilson E. Taylor, Jr.
  • Publication number: 20130113552
    Abstract: A method of re-offsetting a plurality of amplifier is provided. The method includes testing the plurality of amplifiers based on a re-offset value at bulks of compensation transistors of the plurality of amplifiers; identifying a first group of first amplifiers of the plurality of amplifiers favoring reading a first logic level and/or a second group of second amplifiers of the plurality of amplifiers favoring reading a second logic level different from the first logic level, based on results of the testing step; changing the re-offset value to a new re-offset value; re-offsetting the first group of first amplifiers and/or the second group of second amplifiers based on the new re-offset value; and re-testing the first group of first amplifiers and the second group of second amplifiers.
    Type: Application
    Filed: December 27, 2012
    Publication date: May 9, 2013
    Applicant: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY, LTD.
    Inventor: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY, LTD.
  • Publication number: 20130088290
    Abstract: An amplifier circuit includes a first and a second switching element connected in parallel between a first and a second voltage potential and are actuated in the amplifier mode in a clocked manner. A capacitive element is connected in parallel to at least one of the two switching elements, a measuring circuit for measuring the switching edges occurring during switching of the switching elements, and a current-determining circuit for determining the output current by means of the measured switching edges.
    Type: Application
    Filed: October 10, 2012
    Publication date: April 11, 2013
    Inventor: Astrium GmbH
  • Publication number: 20130049855
    Abstract: An integrated circuit comprising a Class-D amplifier for amplifying an input signal at an input terminal is disclosed. The Class-D amplifier is switchable between an operational mode, in which a comparator (4) is directly coupled to an output stage (5), and a test mode, in which the comparator (4) is coupled to the output stage (5) via a sampler (15) and the output stage (5) is coupled to the input terminal via a feedback network, whereby a digital representation of the input signal is available at an output of the sampler (15).
    Type: Application
    Filed: July 25, 2012
    Publication date: February 28, 2013
    Applicant: NXP B.V.
    Inventors: Marco Berkhout, Lûtsen Ludgerus Albertus Hendrikus
  • Publication number: 20130049854
    Abstract: A power efficient, small-packaged radio frequency (RF) transmitter for use in avionics applications. The RF transmitter utilizes Cartesian feedback to operate a power amplifier with Class AB biasing and efficiency, while delivering Class A biasing performance. The RF transmitter includes interstage pads and high pass filters specially configured to meet demanding requirements for both adjacent channel power (ACP) limits and wideband spurious energy limits. The RF transmitter is much smaller in size and dissipates less DC power and heat than previous RF transmitters used in avionics applications.
    Type: Application
    Filed: August 24, 2011
    Publication date: February 28, 2013
    Inventor: Thomas Ogle Shafer
  • Patent number: 8358169
    Abstract: The presently invention is directed to ways to measure distortion effects while allowing for the possibility of significant reduction in test cost. An exemplary embodiment of the present invention provides a method for amplifier distortion measurement including comparing a first amplitude response of an output signal from a power amplifier to a second amplitude response of a reference input signal to determine a set of Amplitude-to-Amplitude (“AM-AM”) distortion values. Additionally, the method for amplifier distortion measurement includes equalizing the first amplitude response of the output signal to match the second amplitude response of the reference input signal based on the set of AM-AM distortion values and creating a difference signal based on a comparison of the equalized output signal to the reference input signal.
    Type: Grant
    Filed: November 1, 2010
    Date of Patent: January 22, 2013
    Assignee: Georgia Tech Research Corporation
    Inventors: Shreyas Sen, Shyam Kumar Devarakond, Abhijit Chatterjee
  • Publication number: 20120326777
    Abstract: An amplifier circuit of envelope tracking has a timing adjusting unit having a finite number of adjustment values for adjusting time by which the output is delayed from the input, and capable of adjusting a time difference between an input signal and a power supply voltage which reach an amplifier, by making a selection from the adjustment values; a test signal output unit capable of repeatedly sending out a test signal serving as the input signal at predetermined cycles; and an adjustment value determining unit sequentially measuring output power for m (?k) periods from the amplifier while changing an adjustment value of the timing adjusting unit to a different value every k period of the test signal, searching for an adjustment value at which a total sum of the output power for m periods is maximum, and setting the adjustment value on the timing adjusting unit.
    Type: Application
    Filed: December 13, 2010
    Publication date: December 27, 2012
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventor: Masahiko Onishi
  • Patent number: 8319549
    Abstract: An integrated power amplifier includes a divider and a combiner. The integrated power amplifier also includes two or more amplifiers. Each of the amplifier input terminals is electrically coupled to a divider output terminal and each of the amplifier output terminals is electrically coupled to a combiner input terminal. At least one power sensor is configured to provide a power amplifier performance metric. The divider and the combiner include a plurality of actuators. Each actuator has at least one actuator control terminal which is configured to provide an actuator setting. The actuators are configured via the actuator control terminals to optimize the power amplifier performance metric. Methods to simulate the operation of a self-healing power amplifier and a process for the operation of a self-healing circuit are also described.
    Type: Grant
    Filed: December 9, 2010
    Date of Patent: November 27, 2012
    Assignee: California Institute of Technology
    Inventors: Kaushik Sengupta, Steven Bowers, Aydin Babakhani, Arthur H. Chang, Seyed Ali Hajimiri
  • Patent number: 8294514
    Abstract: A calibration unit calibrates a power amplifier load impedance to achieve a nominal amplifier load impedance after the connection of one or more external elements, e.g., antenna, to improve the accuracy and effectiveness of output power calibration. The calibration unit comprises an adaptive impedance unit and a controller. The adaptive impedance unit includes first and second variable impedance elements connected between the amplifier and the external load, e.g., antenna. The controller independently calibrates the imaginary and real parts of the load impedance by respectively selecting first and second calibration values for the first and second variable impedance elements based on a reference voltage. More particularly, the controller selects calibration values for the first and second variable impedance elements from a plurality of impedance values based on a comparison between a reference voltage and the calibrated voltages produced at the output of the power amplifier responsive to the impedance values.
    Type: Grant
    Filed: December 30, 2010
    Date of Patent: October 23, 2012
    Assignee: ST-Ericsson SA
    Inventors: Hendrik Visser, Roeland Heijna, Norbert Van Den Bos
  • Publication number: 20120262230
    Abstract: This document discusses apparatus and methods for configuring and providing crosstalk cancellation to maintain channel separation in a multi channel system. In an example, an amplifier circuit can include a crosstalk cancellation circuit configured to reduce crosstalk from a first output to a second load and from a second output to a first load where the first load and the second load share a return path.
    Type: Application
    Filed: October 12, 2011
    Publication date: October 18, 2012
    Inventors: William D. Llewellyn, Carmine Cozzolino
  • Patent number: 8258759
    Abstract: An anti-islanding implementation that introduces a small, continuously varying phase shift pattern in the output current of an inverter. In grid-connected mode, this phase shift pattern has no impact on the frequency of the inverter's output voltage. However, when islanded, the phase shift will cause the voltage frequency to deviate from nominal. Changes in the output current phase thus correlate well with the voltage frequency, so a covariance index is used to detect an islanding configuration. When this index exceeds a threshold, a larger phase shift pattern is introduced in the output current, large enough to cause the voltage frequency to fall outside the inverter's trip protection window without compromising the inverter's power quality yet ensuring reliable tripping of the inverter.
    Type: Grant
    Filed: February 3, 2010
    Date of Patent: September 4, 2012
    Assignee: Xantrex Technology Inc.
    Inventors: Jun Yin, Chi-Sheng Fan, Djordje Garabandic
  • Patent number: 8219336
    Abstract: In order to determine various operational parameters of a power amplifier (for example, a complex load impedance or a complex forward and return power or a reflection factor or a voltage standing wave ratio) on a connecting line between an output of the power amplifier and a complex load, complex analog forward and return voltages on the connecting line are determined by an analog coupling device. These analog voltages are digitized and converted down into a baseband by one or more digital down-converters. From these digital values corresponding in absolute value and phase to the complex forward and return voltages and present in the baseband, desired operational parameters may then be calculated by a computer.
    Type: Grant
    Filed: June 11, 2007
    Date of Patent: July 10, 2012
    Assignee: Rohde & Schwarz GmbH & Co. KG
    Inventors: Daniel Hoebel, Hendrik Koehler
  • Patent number: 8169260
    Abstract: An amplifier circuit performs a characteristic correction process and a smooth curvilinear process on an input signal before being subjected to amplification. The characteristic correction process is a frequency characteristic process, which is performed on the input signal so as to produce a processed signal (Vp). Either the input signal or the processed signal, or the mixture of these signals is subjected to the smooth curvilinear process whose start point is designated by a state variation of amplification (VxTyp). Alternatively it is subjected to a gain decrement process instead of the smooth curvilinear process when the state variation of amplification is less than a default value (VxTHD). Thus, it is possible to prevent clipping from occurring in the amplified output signal while maintaining an adequate power.
    Type: Grant
    Filed: March 25, 2010
    Date of Patent: May 1, 2012
    Assignee: Yamaha Corporation
    Inventor: Morito Morishima
  • Patent number: 8155351
    Abstract: A sound signal generator includes a sound signal output function for outputting a sound signal to a command-driven amplifier that drives a speaker by using the sound signal being converted according to a control command, a first counter control function for changing a content of a first counter in a storage medium in a predetermined manner, a control command sending function for sending a control command to the command-driven amplifier upon having change in the content of the first counter in the predetermined manner, and a second counter control function for changing a content of a second counter in the storage medium in the predetermined manner upon having the control command sent to the command-driven amplifier by the control command sending function.
    Type: Grant
    Filed: January 17, 2006
    Date of Patent: April 10, 2012
    Assignee: Denso Corporation
    Inventor: Atsushi Hayashida
  • Publication number: 20120075014
    Abstract: The invention relates to systems and methods for high-sensitivity detection of input bias current. The invention more particularly relates to platforms and techniques for the calibration and measurement of input bias current in op amps or other devices. In embodiments, the platform can incorporate a servo loop connected to a high-sensitivity test amplifier, such as an instrumentation amplifier. The test amplifier can complete a switchable circuit with the servo loop and detect a calibration input bias current for the test platform, without a production device in place. The device under test can be switched into the servo loop, and the total bias current measured with both the device under test and test amplifier in-circuit. The difference between the measured current with the device inserted and the previously measured calibration current represents the bias current for the subject device, without attaching external meters or requiring reference parts of the production type.
    Type: Application
    Filed: September 29, 2010
    Publication date: March 29, 2012
    Inventors: Dale Alan Heaton, David Walker Guidry
  • Patent number: 8143881
    Abstract: A current measuring apparatus includes a shunt circuit, a current detecting circuit, and a signal amplifying circuit. The current measuring apparatus applies the shunt circuit to receive a current to be measured. The current measuring apparatus applies the current detecting circuit to measure the voltage between two terminals of the shunt circuit. The current measuring apparatus applies the signal amplifying circuit to amplify the measured voltage. The measured current can be calculated according an expression determined by the current detecting circuit and the signal amplifying circuit.
    Type: Grant
    Filed: January 18, 2010
    Date of Patent: March 27, 2012
    Assignee: Hon Hai Precision Industry Co., Ltd.
    Inventor: Kuo-Rong Chen
  • Patent number: 8130735
    Abstract: Methods and systems for a software defined power amplifier for multi-band, multi-standard applications are disclosed and may comprise configuring a single programmable output stage of a multi-band, multi-standard transmitter to handle transmission of a signal according to multiple wireless communication protocols and frequency ranges. The output stage may be configured by coupling a power amplifier (PA) within the programmable output stage to a switch or a duplexer, which may be coupled to one or more of multiple antennas, each of which may handle signals in a different frequency range. Each antenna may be impedance matched with the power amplifier using transformers, and may be coupled by activating at least one integrated transistor. The PA may be biased to operate in one of a plurality of classes of operation comprising Class A, AB, C and F associated with the wireless communication protocols, which may comprise EDGE, GSM, WCDMA and wireless LAN.
    Type: Grant
    Filed: February 26, 2007
    Date of Patent: March 6, 2012
    Assignee: Broadcom Corporation
    Inventor: Ahmadreza Rofougaran
  • Patent number: 8130032
    Abstract: The invention relates to systems and methods for high-sensitivity detection of input bias current. The invention more particularly relates to platforms and techniques for the calibration and measurement of input bias current in op amps or other devices. In embodiments, the platform can incorporate a servo loop connected to a high-sensitivity test amplifier, such as an instrumentation amplifier. The test amplifier can complete a switchable circuit with the servo loop and detect a calibration input bias current for the test platform, without a production device in place. The device under test can be switched into the servo loop, and the total bias current measured with both the device under test and test amplifier in-circuit. The difference between the measured current with the device inserted and the previously measured calibration current represents the bias current for the subject device, without attaching external meters or requiring reference parts of the production type.
    Type: Grant
    Filed: September 29, 2010
    Date of Patent: March 6, 2012
    Assignee: Texas Instruments Incorporated
    Inventors: Dale Alan Heaton, David Walker Guidry
  • Patent number: 8120421
    Abstract: A circuit structure free from test effect is provided. The circuit structure includes a first test terminal and a second test terminal. A symmetric circuit unit is coupled between the first test terminal and the second test terminal. The symmetric circuit unit includes a plurality of transistors, wherein the transistors are symmetrically disposed to form a first part circuit and a second part circuit. A switch control unit alternatively connects the transistors of the first part circuit and the transistors of the second part circuit between the first test terminal and the second test terminal according to a control signal.
    Type: Grant
    Filed: October 22, 2009
    Date of Patent: February 21, 2012
    Assignee: Novatek Microelectronics Corp.
    Inventor: Ju-Lin Huang
  • Publication number: 20120025906
    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: Application
    Filed: October 7, 2011
    Publication date: February 2, 2012
    Applicant: ParkerVision, Inc.
    Inventors: David F. SORRELLS, Gregory S. Rawlins, Michael W. Rawlins
  • Publication number: 20120001686
    Abstract: A high frequency circuit includes an amplifier part that includes a plurality of amplifier circuits amplifying a high frequency signal and connected in parallel, that synthesizes outputs of the amplifier circuit and that supplies the outputs to an antenna; a controller that outputs a low power signal during a low power mode in which the amplifier part operates at low power; and an operation suppressing circuit that disables one of the plurality of amplifier circuits based on the low power signal.
    Type: Application
    Filed: September 23, 2010
    Publication date: January 5, 2012
    Applicant: Icom Incorporated
    Inventor: Yoshio SEKIYAMA
  • Patent number: 8050418
    Abstract: A system and method for updating the software of a digital audio amplifier. The digital data used to update the amplifier's software is transmitted as an analog signal over analog audio channels to the amplifier. The amplifier is adapted to recognize when an audio signal should be used to update the amplifier's software, instead of merely driving the speakers with the audio signal. Upon receiving such an audio signal, the amplifier decodes the analog signal into digital instructions. The digital instructions are processed to reconfigure the amplifier's operation.
    Type: Grant
    Filed: July 7, 2005
    Date of Patent: November 1, 2011
    Assignee: Harman International Industries, Incorporated
    Inventor: Kenneth Carl Furge
  • Patent number: 8040179
    Abstract: Described herein is an apparatus and method for estimating the amount of power that is to be consumed by an amplifier. An estimation section may be determined based on frame data of an input signal that is to be input to the amplifier. The estimation section may be stored to in a predetermined section, and the amount of power to be consumed by the amplifier may be estimated in advance based on the stored signal. The predetermined section may be determined in consideration of response a characteristic of a power supply of the amplifier. The amount of power may be calculated by assigning weight to the stored signal.
    Type: Grant
    Filed: November 21, 2009
    Date of Patent: October 18, 2011
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jung-ho Kim, Young-tae Kim, Sang-chul Ko, Jung-woo Choi
  • Patent number: 8022755
    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: Grant
    Filed: August 13, 2010
    Date of Patent: September 20, 2011
    Assignee: Broadcom Corporation
    Inventors: Ramon Gomez, Jianhong Xiao, Takayuki Hayashi
  • Patent number: 7977618
    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: Grant
    Filed: August 21, 2009
    Date of Patent: July 12, 2011
    Assignee: International Business Machines Corporation
    Inventors: John Andrew Guckenberger, Young Hoon Kwark, Jeremy Daniel Schaub
  • Patent number: 7965136
    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: Grant
    Filed: February 26, 2009
    Date of Patent: June 21, 2011
    Assignee: Astrium Limited
    Inventors: Geoffrey Philip Rhodes, Michael Harverson
  • Publication number: 20110140772
    Abstract: An integrated power amplifier includes a divider and a combiner. The integrated power amplifier also includes two or more amplifiers. Each of the amplifier input terminals is electrically coupled to a divider output terminal and each of the amplifier output terminals is electrically coupled to a combiner input terminal. At least one power sensor is configured to provide a power amplifier performance metric. The divider and the combiner include a plurality of actuators. Each actuator has at least one actuator control terminal which is configured to provide an actuator setting. The actuators are configured via the actuator control terminals to optimize the power amplifier performance metric. Methods to simulate the operation of a self-healing power amplifier and a process for the operation of a self-healing circuit are also described.
    Type: Application
    Filed: December 9, 2010
    Publication date: June 16, 2011
    Applicant: California Institute of Technology
    Inventors: Kaushik Sengupta, Steven Bowers, Aydin Babakhani, Arthur H. Chang, Seyed Ali Hajimiri
  • Patent number: 7949365
    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: March 20, 2007
    Date of Patent: May 24, 2011
    Assignee: ParkerVision, Inc.
    Inventors: David F. Sorrells, Gregory S. Rawlins, Michael W. Rawlins
  • Patent number: 7932776
    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 23, 2009
    Date of Patent: April 26, 2011
    Assignee: ParkerVision, Inc.
    Inventors: David F. Sorrells, Gregory S. Rawlins, Michael W. Rawlins
  • Patent number: 7912430
    Abstract: A circuit arrangement for wirelessly exchanging data with a reader device, including an antenna for converting electromagnetic radiation into an antenna voltage, an analogue circuit for demodulating an information signal based on the antenna voltage, and a digital circuit for processing of the information signal and for receiving power from the analogue circuit. The circuit arrangement also includes a decoupling circuit, which is interconnected between the analogue circuit and the digital circuit and provides a decoupling of both circuits.
    Type: Grant
    Filed: February 2, 2007
    Date of Patent: March 22, 2011
    Assignee: Infineon Technologies AG
    Inventors: Walter Kargl, Richard Sbuell
  • Patent number: 7885797
    Abstract: One embodiment of the present invention is a method for producing a system for describing an electrical network. An output signal of the electrical network is sampled at a frequency that corresponds to the Nyquist criterion for the input signal to the electrical network. A model with a memory is developed for the output signal, which is sampled at a low sampling rate, with this model approximating the output signal. The model is then transformed by suitable interpolation to an interpolated model with a memory. The interpolation results in the model created in this way providing a good approximation to an output signal which is sampled at a high frequency. The resultant system can be used for predistortion.
    Type: Grant
    Filed: June 2, 2006
    Date of Patent: February 8, 2011
    Assignee: Infineon Technologies AG
    Inventors: Heinz Köppl, Peter Singerl
  • Patent number: 7863975
    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: Grant
    Filed: May 13, 2009
    Date of Patent: January 4, 2011
    Assignee: Ralink Technology Corp.
    Inventors: Chun-Hsien Wen, Yun-Shen Chang, Wen-Sheng Hou, Chien-Cheng Lin, Jiunn-Tsair Chen
  • Publication number: 20100327968
    Abstract: Method and system for optimising operating temperature in a power amplifier of a base station of a cellular telecommunications network. The system comprises: a power amplifier of a BTS the power amplifier configured for: measuring its operating temperature; if the operating temperature exceeds a temperature threshold TTH, sending an alarm message to a controller unit; the controller unit, which can be included in the BTS or in the corresponding BSC or RNC, configured for analyzing the alarm messages received and, when determined conditions are met, executing at least one action from a list of actions to reduce the dissipated power of the power amplifier.
    Type: Application
    Filed: June 30, 2010
    Publication date: December 30, 2010
    Applicant: VODAFONE GROUP PLC
    Inventors: Inigo Güemes Cabrejas, Miguel Arranz Arauzo, Alberto Gómez Coloma
  • Patent number: 7859330
    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: April 9, 2009
    Date of Patent: December 28, 2010
    Assignee: The DIRECTV Group, Inc.
    Inventors: Guangcai Zhou, Tung-Sheng Lin, Dennis Lai, Joseph Santoru, Ernest C. Chen, Shamik Maitra, Cecilia Comeaux
  • Patent number: 7856048
    Abstract: The disclosure can provide methods and systems for autocalibrating a transceiver. The method can include upconverting a bandpass input signal by mixing the bandpass input signal with a first local oscillator signal to form an initial transmitter signal. The initial transmitter signal can be looped back to a receiver and downconverted with a second local oscillator signal having a frequency that is different from the first local oscillator to form an intermediate frequency signal. At least one of a gain and a phase of the transmitter can be adjusted based on a transmitter image sideband of the intermediate frequency signal to generate a calibrated transmitter signal having minimized transmitter image sideband.
    Type: Grant
    Filed: November 19, 2007
    Date of Patent: December 21, 2010
    Assignee: Marvell International, Ltd.
    Inventors: Lydi Smaini, Neric Fong, Sang Won Son, Bo Wang
  • Patent number: 7848451
    Abstract: A system and method 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 as a constant value; averaging in the time domain the rotated coefficient set to obtain an averaged coefficient set; applying the averaged coefficient set to the DPD engine, the initial coefficient set expressed in a first equation [27]; computing the phase of the fundamental components of the initial coefficient set with a second equation [28]; and computing the rotated coefficient set with a third equation [29].
    Type: Grant
    Filed: October 16, 2009
    Date of Patent: December 7, 2010
    Assignee: Miroelectronics Technology Inc.
    Inventors: Khiem V. Cai, David B. Rutan, Matthew S. Gorder, Don C. Devendorf
  • Patent number: 7840015
    Abstract: A thermal sensor at the output of a switching amplifier senses heat dissipation at the output switch. If an overheating condition is sensed, gain of the digital input signal is lowered to reduce output power of the audio output signal.
    Type: Grant
    Filed: September 4, 2002
    Date of Patent: November 23, 2010
    Assignee: Cirrus Logic, Inc.
    Inventors: John L. Melanson, Xiaofan Fei, Johann G. Gaboriau, Steven Green, Jason P. Rhode, Eric Walburger, Wilson E. Taylor, Jr.
  • Patent number: 7826810
    Abstract: Transmitter (116) designed to automatically reconfigure one or more circuit parameters associated with an RF power amplifier (210) in response to certain user input commands. Specifically, a transmitter circuit configuration is automatically modified under certain conditions to produce a higher RF output power. The higher RF power output is possible because the transmitter configuration is adjusted specifically for use under a particular set of operating conditions. The operating conditions that trigger the higher powered configuration include burst transmission mode.
    Type: Grant
    Filed: May 8, 2006
    Date of Patent: November 2, 2010
    Assignee: Harris Corporation
    Inventors: Travis D. Carmel, Kenneth P. Beghini
  • Patent number: 7809081
    Abstract: A method and computer program product for operating a linearizer for a circuit, including generating a set of coefficients via a characterizer; predistorting a signal input to the circuit responsive to the coefficients and generating a linearized output in response thereto; filtering the signal through a linear digital filter having linear digital filter taps, each tap other than a first tap being successively delayed by one delay unit; generating powers of the signal; inputting the generated powers of the signal through tapped delay lines, each line having nonlinear digital filter taps, each tap other than a first tap being successively delayed by one delay unit; applying the coefficients to the linear and nonlinear digital filter taps; summing each of the nonlinear digital filter taps corresponding to a certain number of delay units; and adding the sum of each of the delay units to a particular linear digital filter tap.
    Type: Grant
    Filed: October 7, 2009
    Date of Patent: October 5, 2010
    Assignee: Microelectronics Technology, Inc.
    Inventors: Khiem V. Cai, David B. Rutan, Matthew S. Gorder, Don C. Devendorf
  • Patent number: 7804356
    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: Grant
    Filed: July 14, 2008
    Date of Patent: September 28, 2010
    Assignee: Broadcom Corporation
    Inventors: Ramon Gomez, Jianhong Xiao, Takayuki Hayashi
  • Patent number: RE43461
    Abstract: Systems and methods for detecting the impedance of an output load coupled to a digital amplifier and compensating for changes in the response of the amplifier. One embodiment of the invention is implemented in a Class D pulse width modulated (PWM) amplifier. In this embodiment, a digital PCM test signal is generated. This test signal is processed by the amplifier to produce a corresponding analog audio output signal that is used to drive a speaker. A sense resistor placed in series with the speaker is used to generate a test voltage that is compared to a reference voltage. When the test voltage reaches the reference voltage, the current through the sense resistor (hence the speaker) is at a known level, so the value of the digital test signal is noted. The impedance of the speaker is then determined from the test signal value and the speaker current.
    Type: Grant
    Filed: August 20, 2009
    Date of Patent: June 12, 2012
    Assignee: D2Audio Corporation
    Inventors: Larry E. Hand, Wilson E. Taylor