Amplifiers inventions 01/09

20090027116 - Method and integrated circuit including an amplifier calibration circuit: 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,... Agent: Dicke, Billig & Czaja

20090027118 - Digital pwm amplifier having a low delay corrector: Systems and methods for performance improvements in digital switching amplifiers using a low delay corrector. In one embodiment, a digital pulse width modulation (PWM) amplifier includes a signal processing plant configured to receive and process an input audio signal. The amplifier also includes a low delay corrector configured to receive... Agent: Law Offices Of Mark L. Berrier

20090027117 - Low-noise, low-distortion digital pwm amplifier: Systems and methods for performance improvements in digital switching amplifiers using low-pass filtering to reduce noise and distortion. In one embodiment, a digital pulse width modulation (PWM) amplifier includes a signal processing plant configured to receive and process an input audio signal. The amplifier also includes a low-pass filter configured... Agent: Law Offices Of Mark L. Berrier

20090027119 - Reduced distortion radio frequency amplifiers: A radio frequency power amplifier system includes a power amplifier coupled to an input signal and configured to provide an output signal at a radio frequency; a signal cancellation system coupled to the input signal, and a first feedback signal, which is based on the output signal, and configured to... Agent: Law Offices Of Charles W. Bethards, LLP

20090027121 - Class d amplifier circuit: A pulse monitor circuit detects the presence or non-presence of the output pulses output from an output stage circuit. The pulse monitor circuit outputs an up signal to the up/down counter when the output pulses do not exist at all and outputs a down signal to the up/down counter when... Agent: Pillsbury Winthrop Shaw Pittman LLP

20090027120 - Class-d amplifier with noise-immunity feedback: A class-D amplifier includes a switching transistor section, a filter, an analog to digital converter, and a feedback module. The switching transistor section is operably coupled to convert a serial input into a switched output signal. The filter is operably coupled to filter the switched output signal to produce an... Agent: Ingrassia Fisher & Lorenz, P.C. (fs)

20090027122 - Compact low-power class ab amplifier: A compact low-power class AB power amplifier design is provided. In an embodiment, the amplifier design eliminates an intermediate stage that couples an input stage and a biasing mesh of the amplifier. In another embodiment, the amplifier design reuses a tail current from the input stage to bias the biasing... Agent: Sterne, Kessler, Goldstein & Fox P.l.l.c.

20090027123 - Controlled transconductance differential stage: A differential stage which uses a bias generator circuit to set the operating currents of the input stage FETs to make the incremental Gm primarily a function of a single resistor embedded in the biasing circuit, such that the input stage has a Gm which only gradually departs from nominal... Agent: Koppel, Patrick & Heybl

20090027124 - Level-shifting buffer: An analog level-shifting buffer for providing signal amplitude and/or common mode adjustment is disclosed. In one example, a receiver system may include a first amplification stage that is powered, for example, via an I/O power supply (e.g., VDDIO) and a second amplification stage that is powered, for example, via a... Agent: Downs Rachlin Martin PLLC

20090027125 - Common mode rejection calibration method for difference amplifiers: A common mode rejection calibration scheme for use with a difference amplifier having an associated signal path. A signal is generated which varies with the common mode voltage of the differential input voltage applied to the amplifier. This signal is scaled and coupled into the signal path such that the... Agent: Koppel, Patrick & Heybl

20090027126 - Method for adaptive biasing of fully differential gain boosted operational amplifiers: An adaptive biasing technique improves fully differential gain boosted operational amplifiers transient characteristics and reduces power consumption. An adaptive biasing module includes a bias generation module and a bias replication module. The bias generation module generates a first control signal (VCMNB) and the first control signal is applied as an... Agent: Gardere Wynne Sewell LLP Intellectual Property Section

20090027127 - System and method for amplifier gain measurement and compensation: 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... Agent: Texas Instruments Incorporated

20090027128 - Variable gain amplifier: The present invention provides a variable gain amplifier including a plurality of initial-stage LNAs 1 to 4 connected parallel to one input terminal IN, a next-stage LNA 5 connected after the initial-stage LNAs 1 to 4 and a variable current source 20 that performs control such that a total value... Agent: Connolly Bove Lodge & Hutz LLP

20090027129 - High power rf solid state power amplifier system: A high power, high frequency, solid state power amplifier system includes a plurality of input multiple port splitters for receiving a high-frequency input and for dividing the input into a plurality of outputs and a plurality of solid state amplifier units. Each amplifier unit includes a plurality of amplifiers, and... Agent: Nasa/marshall Space Flight Center

20090027130 - Power amplifier: A power amplifier according to the present invention is operated by switching a main power amplifier and a subsidiary power amplifier. The idle current of the subsidiary power amplifier is smaller than the idle current of the main power amplifier. Each of the main power amplifier and the subsidiary power... Agent: Leydig Voit & Mayer, Ltd

20090021300 - Apparatus and method for detecting output power from an amplifier: 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... Agent: Ralph A. Dowell Of Dowell & Dowell P.c.

20090021301 - Efficient composite amplifier: A detuned composite amplifier includes a nonlinear drive function (22) that has a phase that varies with the composite amplifier output voltage amplitude. The nonlinear drive function (22) is configured to transform the output voltage transition point of the prior art into an extended output voltage transition region to increase... Agent: Ericsson Inc.

20090021303 - Distortion-driven power amplifier power supply controller: A power amplifier controller measures the distortion of a power amplifier output. Based upon the distortion measured, the supply voltage to the PA is adjusted in a control loop. In one embodiment, distortion is measured by computing the ratio of the measured power in the output frequencies outside the desired... Agent: Fenwick & West LLP

20090021302 - Method and apparatus for reducing current consumption of mimo systems: Apparatus and method for reducing the current consumption and increasing the efficiency of a MIMO system, consisting of one or more RF power amplifiers (PAs) and that is required to provide a desired total output power level. An individual output power level which is a portion of the total output... Agent: Marsteller & Associates

20090021304 - Model based distortion reduction for power amplifiers: A method of processing a signal is disclosed. The method comprises generating a digital signal, converting the digital signal to an analog signal, and generating an amplified analog signal having distortions. The method further comprises converting the amplified analog signal to a feedback digital signal at a sample rate and... Agent: Van Pelt, Yi & James LLP

20090021305 - Class d amplifier: Class D amplifier is resistant to interferences. Binary output signals y1 and y2, are generated from input signal s1, delivered to input terminal IN, to drive a load connected across output terminals OUTP and OUTN. Pulse generating circuit 10 generates a pulse width modulated pulse signal y0 from input signal... Agent: Mcginn Intellectual Property Law Group, Pllc

20090021306 - Integrated circuit system for line regulation of an amplifier: An integrated circuit system is provided including forming a differential pair; reducing a mismatch in the differential pair by: coupling an amplifier to the differential pair; and coupling a local feedback network to the amplifier in which referencing the local feedback network includes coupling a first voltage; and driving an... Agent: Law Offices Of Mikio Ishimaru

20090021307 - Multi-band, inductor re-use low noise amplifier: Described herein are multi-band LNAs that reuse inductors for different frequency bands to minimize chip area. In an embodiment, a multi-band LNA is capable of operating in a narrowband (NB) and a wideband (WB) while reusing at least one input impedance matching inductor and at least one load inductor for... Agent: Orrick, Herrington & Sutcliffe, LLP Ip Prosecution Department

20090021308 - Voltage regulator startup method and apparatus: A voltage regulator circuit comprises an amplifier, bias network and startup circuit. The bias network is configured to generate a bias voltage for setting a bias current in the amplifier. The startup circuit is configured to mirror the amplifier bias current and to assist the bias network in setting the... Agent: Coats & Bennett/qimonda

20090021309 - Fully integrated ultra wideband transmitter circuits and systems: Disclosed is a novel design of a fully integrated UWB transmitter. The transmitter includes a pulse generator, a pulse modulator, and an ultra-wideband drive amplifier. A new low voltage low power pulse generator circuit is disclosed which can be fully integrated in CMOS or BiCMOS process. This circuit includes a... Agent: Crockett & Crockett, P.c.

20090015323 - Balanced amplifier with protection circuit: According to an exemplary embodiment, a balanced amplifier includes an in-phase amplifier coupled to a first input port of an output coupler and a quadrature amplifier coupled to a second input port of the output coupler. The balanced amplifier further includes an impedance termination coupled to an isolated port of... Agent: Farjami & Farjami LLP

20090015324 - Power amplifier amplitude modulator system and method: A system for controlling amplifier power is provided. The system includes a voltage envelope detector receiving a voltage signal and generating an attenuated voltage envelope signal. A current envelope detector receives a current signal and generates an attenuated current envelope signal. A controller receives power level data and generates attenuation... Agent: Mr. Christopher John Rourk Jackson Walker LLP

20090015326 - Distortion compensation apparatus: A distortion compensation apparatus includes distortion generating means for generating distortions to compensate for a distortion generated in an amplifier 2. The distortion generating means includes a nonlinear circuit 13 having an input/output expansion characteristic as a circuit which generates a distortion of the lowest odd order as a compensation... Agent: Mattingly, Stanger, Malur & Brundidge, P.C.

20090015325 - Method and apparatus for pre-conditioning an electrical signal: 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... Agent: Howard & Howard Attorneys, P.C.

20090015327 - Switching audio power amplifier with de-noise function: The invention provides a switching audio power amplifier with de-noise function including a pulse width modulator, a de-noise circuit and a bridge circuit. The pulse width modulator performs pulse width moderation to generate the first and second PWM signals according to an input audio signal. The de-noise circuit receives the... Agent: Jianq Chyun Intellectual Property Office

20090015328 - Low offset envelope detector and method of use: A system for processing a signal is provided. The system includes a differential amplifier receiving a radio-frequency input signal at a first differential input. A rectifying device such as a transistor has a control terminal that is coupled to an output of the differential amplifier and an output that is... Agent: Mr. Christopher John Rourk Jackson Walker LLP

20090015329 - Low voltage track and hold circuits: Circuits that operate with power supplies of less than 1 Volt are presented. More particularly, circuits that operate with supply voltages near or lower than the threshold voltage of the transistors in those circuits are presented. Various circuits and embodiments such as operational transconductance amplifiers, biasing circuits, integrators, continuous-time sigma... Agent: Wilmerhale/columbia University

20090015330 - Variable transconductance circuit: The variable transconductance circuit includes: a voltage-current conversion circuit for outputting a current signal linear with an input voltage signal; first and second MOS transistors for converting the current signal received to a square-root compressed voltage signal; and third and fourth MOS transistors for converting the square-root compressed voltage signal... Agent: Mcdermott Will & Emery LLP

20090015331 - Current sense amplifier for voltage converter: A variable gain amplifier comprising a differential input amplifier comprising a pair of transistors each having an input across which an input voltage is provided, the transistors being coupled such that each transistor is provided in series with a respective current source providing a reference current and whereby a current... Agent: Ostrolenk Faber Gerb & Soffen

20090015332 - Startup circuit for subregulated amplifier: A multi-stage circuit has a first stage powered by the output voltage of a next stage. A current source within the first stage provides a tail current for a differential amplifier within the first stage. When the first stage has an operating voltage high enough for proper operation, this tail... Agent: Texas Instruments Incorporated

20090015334 - Bypass circuit for radio-frequency amplifier stages: An amplifier circuit includes an amplifier and a phase shifter coupled in parallel to the amplifier and switchable such that the phase shifter has a first impedance for an alternating signal in an on state and has a second impedance for the alternating signal in an off state. The second... Agent: Slater & Matsil LLP

20090015333 - Power amplifier module and a time division multiple access radio: A power amplifier module comprises a power amplifier circuit having an output power level controlled by a power supply voltage. A power supply transistor controls the power supply to the power amplifier circuit from a drive signal which is received from a drive circuit. The drive circuit generates the drive... Agent: Freescale Semiconductor, Inc. Law Department

20090015335 - Variable-gain image-reject low-noise amplifier: A variable-gain amplifier includes an intermediate node operative to receive an electric current from a current source. A common-emitter amplifier has a collector electrically connected to the intermediate node. A first common-base amplifier has an emitter electrically connected to the intermediate node and a collector electrically connected to an output... Agent: Ryan, Mason & Lewis, LLP

20090015336 - Segmented power amplifier: A system for amplifying a signal is provided. The system includes a plurality of driver stages, each having an input, an output, and a disable control. An output stage having an input is coupled to the outputs of the plurality of driver stages. A plurality of disable control signals is... Agent: Mr. Christopher John Rourk Jackson Walker LLP

20090015337 - Device and method for biasing a transistor amplifier: a biasing circuit adapted for operative coupling to the first input terminal so as to provide a relatively high biasing impedance to ground at the first input terminal, said biasing circuit being adapted to controllably vary the DC-voltage signal which biases the transistor amplifier, whilst at least one component of... Agent: Sonnenschein Nath & Rosenthal LLP

20090009243 - Methods and apparatus for controlling leakage and power dissipation in radio frequency power amplifiers: A radio frequency power amplifier (RF PA) apparatus includes an RF PA and a waveform converter. The waveform converter is configured to receive a sinusoidal RF signal and generate a nonsinusoidal RF signal, which is used to drive an active device (e.g., a field effect transistor (FET) or bipolar junction... Agent: Patent Law Professionals

20090009240 - Amplifier circuit: An amplifier circuit block and a compensation circuit block are provided. The amplifier circuit block includes an analog adder for subtracting an output signal of the compensation circuit block from an input signal and an amplifier circuit operating in a wide band. The compensation circuit block includes an amplifier circuit... Agent: Antonelli, Terry, Stout & Kraus, LLP

20090009239 - Low glitch offset correction circuit for auto-zero sensor amplifiers and method: An instrumentation amplifier includes first (11A) and second (12A) input amplifiers having outputs (15A,B) coupled to an output amplifier (13). A first auto-zero stage (20) in the first input amplifier is auto-zeroed to a first voltage level (VREFL), a first input signal (Vin+) is amplified by a second auto-zero stage... Agent: Texas Instruments Incorporated

20090009241 - Power amplifier using power combiner: Disclosed herein is a power amplifier using a power combiner, which is capable of minimizing power loss and improving efficiency of the power amplifier with a large output power, by combining powers generated by a plurality of power amplifiers used in a wireless communication system using a transmission line transformer.... Agent: Oliff & Berridge, PLC

20090009242 - Line driver capable of automatically adjusting output impedance: A line driver includes: a differential amplifier for amplifying an input signal to generate an output signal; first and second series resistors coupled respectively to output terminals of the differential amplifier and through which the output signal is output; first and second negative-feedback resistors each coupled between a respective input... Agent: Foley And Lardner LLP Suite 500

20090009244 - High-frequency circuit: The potential of a source terminal of a transistor is fixed; a load is connected to a drain terminal of the transistor; and an input signal is received by a gate terminal of the transistor. A series circuit including an inductor and a capacitor connected in series is provided between... Agent: Mcdermott Will & Emery LLP

20090009245 - Circuit for adjusting an impedance: The invention relates to a circuit for adjusting an impedance between two terminals, said impendance including the input impedance of the circuit. The aim of the invention is to enlarge the adjustment range and to stabilize—the operating behavior of such a circuit. For this purpose, the circuit comprises amplifiers, adjusting... Agent: Moore & Van Allen PLLC

20090009246 - Electronic circuit: An electronic circuit includes a differential amplifier circuit, a first smoothing circuit, a second smoothing circuit and a first switch. The differential amplifier circuit receives a digital input signal and a reference signal. The first smoothing circuit smoothes the digital input signal with a first capacitance value. The second smoothing... Agent: Westerman, Hattori, Daniels & Adrian, LLP

20090009247 - Differential amplifier and sampling and holding circuit: Disclosed is a differential amplifier including: first and second transistors each having a first gate, a second gate, a source, and a drain open to a drain side, the first gate and the second gate being controlled independently, a differential input being supplied to between the first gates of the... Agent: Amin, Turocy & Calvin, LLP

20090009248 - Input buffer with optimal biasing and method thereof: A method and circuit of a biased input buffer is described to maximize the quality in the output signals. The input buffer includes a first stage for receiving differential input signals and generating differential internal signals as biased in response to an averaging of the differential internal signals. The input... Agent: Trask Britt, P.C./ Micron Technology

20090009249 - Input stage: An input stage receives a differential input signal at first and second input nodes and provides a differential output current at first and second output nodes. The differential output current includes a component taken from the input nodes through first and second impedances, and an additional component generated in response... Agent: Marger Johnson & Mccollom, P.C.

20090009250 - Low noise amplifier: For a first transistor, a source thereof is coupled to an input terminal and a drain thereof is coupled to an output terminal. A first variable impedance circuit is arranged between a gate of the first transistor and ground, and the impedance thereof is changed according to a first control... Agent: Arent Fox LLP

20090009251 - Feedback limiter with adaptive time control: The invention relates to a compressor and method for amplifying an input signal with a controlled gain. An output signal representing the input signal is amplified by an initial gain and a signal level of the input signal or of the output signal is compared with a threshold level. If... Agent: O''shea Getz P.C.

20090009252 - Rf variable gain amplifier: A RF variable gain amplifier with an extended linear tuning range is disclosed. The variable gain amplifier employs a wide swing cascode mirror formed by two cascode transistors and two gain transistors. The two cascode transistors track each others so are the two gain transistor. The gain transistors operate on... Agent: Wang Law Firm, Inc.

20090009253 - Analog circuit: A resistor (9-1) and a resistor (11-1) are connected in parallel with each other between a source of an input transistor (7-1) and the ground. A switch (12-1) is provided between the resistor (11-1) and the source. A variable resistor circuit may be constituted by the resistor (9-1), the resistor... Agent: Arent Fox LLP

20090009254 - Current sense amplifier for voltage converter: A thermal calibration circuit for adjusting the gain of a variable gain amplifier, the thermal calibration circuit comprising an interface for receiving a signal that varies with temperature and for providing a signal related to the variation of the temperature; a variable gain amplifier having an input and an output;... Agent: Ostrolenk Faber Gerb & Soffen

20090009255 - Unilateral feedback power amplifier and method for realizing the same: A unilateral feedback power amplifier utilizes new feedback techniques and devices to make the amplified high-frequency signal unilateral, let the output power, power gain and impedance matching simultaneously accomplish the optimal values, and enhance the stability of the system. In this feedback amplifier, a generalized multi-port feedback circuit is in... Agent: Rosenberg, Klein & Lee

20090002068 - Dynamic biasing system for an amplifier: A dynamic biasing system (“DBS”) for dynamically biasing an amplifier with an adjusted bias signal is shown. The DBS may include a first biasing circuit that produces a bias signal and a second biasing circuit in signal communication with both the first biasing circuit and the amplifier, wherein the second... Agent: Smith Frohwein Tempel Greenlee Blaha, LLC

20090002069 - Variable circuit, communication apparatus, mobile communication apparatus and communication system: A variable circuit that has a device that changes the mechanical state thereof and has a characteristic that is changed by a change of the mechanical state of the device, the variable circuit including: a controlling section 20 that turns the device from a current state, which is a current... Agent: Oblon, Spivak, Mcclelland Maier & Neustadt, P.C.

20090002070 - Methods and apparatus to control rail-to-rail class ab amplifiers: In one example, an amplifier for providing stable output quiescent current comprising includes a number of supply rails, an output device configured for providing an output voltage, the output device coupled to the plurality of supply rails, and an output quiescent current controller coupled to the plurality of supply rails... Agent: Texas Instruments Incorporated

20090002071 - Distributed circular geometry power amplifier architecture: The present invention discloses a distributed power amplifier topology and device that efficiently and economically enhances the power output of an RF signal to be amplified. The power amplifier comprises a plurality of push-pull amplifiers interconnected in a novel circular geometry that preferably function as a first winding of an... Agent: Mr. Christopher John Rourk Jackson Walker LLP

20090002072 - Power amplification device: A power amplification device includes a BTL amplification circuit including a first amplification circuit and a second amplification circuit, the first amplification circuit including a first output transistor, a first power detection circuit, a second output transistor, and a second power detection circuit, the second amplification circuit including a third... Agent: Amin, Turocy & Calvin, LLP

20090002073 - Wideband variable gain amplifier with clipping function: The present invention relates to a variable gain amplifier. The variable gain amplifier includes an input unit including first and second input nodes and an output node, the input unit being configured to receive first and second input signals. The variable gain amplifier further includes a first clipping unit operable... Agent: Jones Day

20090002075 - Amplifier with configurable dc-coupled or ac-coupled output: A multi-mode amplifier with configurable DC-coupled or AC-coupled output is described. In one design, the multi-mode amplifier includes an amplifier and at least one DC level shifting circuit. The amplifier receives and amplifies an input signal and provides an output signal that is suitable for DC coupling to a load... Agent: Qualcomm Incorporated

20090002074 - Power supply control circuit: The present invention is to provide a power supply control circuit that can effectively eliminate voltage distortion of an input signal during signal amplification. A power supply control circuit which controls a power supply voltage of a direct-current power source at a constant level and supplies the power supply voltage... Agent: Finnegan, Henderson, Farabow, Garrett & Dunner LLP

20090002076 - Signal waveform equalizer circuit and receiver circuit: A signal waveform equalizer circuit capable of equalizing the waveform of an input signal with a center voltage of 0 V and yet small in circuit scale. An input signal (in FIG. 1, positive-phase input signal) whose waveform is to be equalized is input to the source of an NMOS,... Agent: Arent Fox LLP

20090002077 - Monolithic flexible power amplifier using integrated tunable matching networks: A flexible power amplifier can be adapted during operation for use in connection with two or more different wireless standards. In at least one embodiment, adaptations to power transistor size, RF bias current, and matching are made when a corresponding multi-standard wireless device changes the wireless standard under which it... Agent: The Law Offices Of John C. Scott, LLC C/o Intellevele, LLC

20090002078 - Preamplifier and optical receiving device including the same: A preamplifier includes a single-ended amplifier, a differential amplifier, an operational amplifier, and a clipping circuit. The single-ended amplifier converts an input current signal into a voltage signal, outputs an amplified voltage signal according to a preset amplification gain. The differential amplifier includes first and second differential inputs, and outputs... Agent: Volentine & Whitt PLLC