Amplifiers inventions 09/09

20090237156 - Power amplifiers having improved startup linearization and related operating methods: Systems and methods are described for improving the startup linearization of a power amplifier. A bias network is provided to generate a bias signal during amplifier startup, and the amplifier is configured to produce an output signal in response to the input signal and the bias signal. A variable impedance... Agent: Ingrassia Fisher & Lorenz, P.C. (fs)

20090237157 - Power amplifier edge evaluation-alternative envelope modulator: A modulator includes a power driver, a power amplifier, and a heterojunction bipolar transistor (HBT) type device. The power driver is for receiving an amplitude modulation signal and for providing a control signal. The power amplifier is for receiving a phase modulation signal, a bias voltage, and the control signal.... Agent: Snell & Wilmer L.L.P. (panasonic)

20090237158 - Electronic device having a predistortion filter and related methods: An electronic device includes a nonlinear power amplifier, a predistortion coefficient calculator, and a memory polynomial predistortion filter coupled to the nonlinear power amplifier and to the predistortion coefficient calculator. The memory polynomial predistortion filter may include a plurality of finite impulse response (FIR) filter stages, and a summer coupled... Agent: Allen, Dyer, Doppelt, Milbrath & Gilchrist

20090237159 - Output stage circuit: A PWM signal drives a pair of output transistors connected in series between a supply line and ground so that a push-pull current is output toward a speaker via a coil from a point connecting both output transistors. A current limiting resistor has one end connected to the supply line... Agent: Cantor Colburn, LLP

20090237160 - Switch mode power amplifier using mis-hemt with field plate extension: Disclosed are a switch mode power amplifier and a field effect transistor especially suitable for use in a switch mode power amplifier. The transistor is preferably a compound high electron mobility transistor (HEMT) having a source terminal and a drain terminal with a gate terminal therebetween and positioned on a... Agent: Myers Bigel Sibley & Sajovec, P.A.

20090237164 - Low leakage current amplifier: A circuit includes first, second, and third inverters and first and second transistors. The first inverter has an input, an output, a first supply terminal, and a second supply terminal. The second inverter has an input, an output, a first supply terminal, and a second supply terminal. The first transistor... Agent: Freescale Semiconductor, Inc. Law Department

20090237162 - Low skew differential amplifier using tail voltage reference and tail feedback: Using the tail level referencing for an inverter stage immediately following a differential amplifier provides trip point tracking with the variations in magnitude of the output level swings on the differential amplifier stage output over the operating range of the circuit. When the tail voltage increases and the VOL of... Agent: Hogan & Hartson LLP

20090237161 - Quadrature output low noise transconductance amplifier having differential input: A device for providing low noise transconductance amplification is presented. The device includes a PMOS transconductance section configured to receive a differential RF input signal, a PMOS cascode section coupled to the PMOS transconductance section, an NMOS transconductance section configured to receive the RF differential input signal, and an NMOS... Agent: Qualcomm Incorporated

20090237163 - Trimming technique for high voltage amplifiers using floating low voltage structures: The system contains a first MOS transistor having a first source element, a first drain element, and a first gate element. A first low voltage current source has two ends. The ends of the low voltage current source are connected to at least two of the first MOS transistor elements.... Agent: Hayes Soloway P.C.

20090237165 - Cross-coupled low noise amplifier for cellular applications: Cross-coupled low noise amplifier for cellular applications. A circuitry implementation that includes two pairs of metal oxide semiconductor field-effect transistors (MOSFETs) (either N-type of P-type) operates as an LNA, which can be used within any of a wide variety of communication devices. In one embodiment, this design is particularly adaptable... Agent: Garlick Harrison & Markison

20090237166 - High frequency power amplifier: A high frequency power amplifier comprises: a multi-finger transistor with transistor cells electrically connected in parallel; an input side matching circuit connected to gate electrodes of the transistor cells; and resonant circuits respectively connected between the gate electrode of a transistor cell and the input side matching circuit. The resonant... Agent: Leydig Voit & Mayer, Ltd

20090237167 - Integrated amplifier circuit: An integrated amplifier circuit includes an input, an output, a transistor with a transistor-input terminal, the transistor-input terminal being coupled to the input, and a transistor-output terminal. The transistor-output terminal is coupled to the output by means of a DC-path. The DC-path includes a first inductive element and a parallel... Agent: Slater & Matsil LLP

20090231029 - Combination offset voltage and bias current auto-zero circuit: A circuit with an input acquisition loop and an output acquisition loop is used to compensate for the input offset voltage and bias current errors of an operational amplifier.... Agent: Fliesler Meyer LLP

20090231030 - Audio power amplifier and a pre-amplifier thereof: An audio power amplifier includes a pre-amplifier, an error amplifier, a comparator, a bridge circuit, and a feedback circuit, in which the gain of the pre-amplifier gradually increases when the audio power amplifier is powered on. The comparator generates a PWM signal by comparing a reference signal and an amplified... Agent: Hayes Soloway P.C.

20090231031 - High-impedance level-shifting amplifier capable of handling input signals with a voltage magnitude that exceeds a supply voltage: A level-shifting amplifier is provided for level-shifting an input signal with a voltage magnitude that exceeds a supply voltage of the amplifier. In operation, the amplifier has an input impedance of greater than 100 MOhms.... Agent: Zilka-kotab, PC

20090231033 - Amplifier circuit: Power consumption of current sources in an amplifier circuit is reduced even during amplifier operation while keeping linearity of an output signal. The amplifier circuit is suitable for use in a signal generator that provides an output signal previously set by a user and having a known level. Positive and... Agent: William K. Bucher Tektronix, Inc.

20090231032 - Linc amplifying device: An amplifying apparatus includes a splitting unit for splitting an input signal into a first split signal and a second split signal; phase-shifting unit for phase-shifting the first split signal and the second split signal, respectively; a first amplifying unit for amplifying a first phase-shifted signal and outputting the signal... Agent: Bacon & Thomas, PLLC

20090231034 - Inverse mode sige hbt cascode device and fabrication method: Disclosed is a device structure using an inverse-mode cascoded Silicon-Germanium (SiGe) Heterojunction Bipolar Transistor (HBT) beneficial in applications requiring radiation hardened circuitry. The device comprises a forward-mode common-emitter HBT cascoded with a common-base inverse-mode HBT, sharing a common sub-collector. An exemplary device was measured to have over 20 dB of... Agent: Kenneth W. Float

20090231035 - Class d audio amplifier: A class D audio amplifier includes an error amplifier, a comparator, a bridge circuit, a feedback circuit and a silent start circuit. The error amplifier generates an error signal by amplifying a difference between a feedback signal and an audio input signal. The comparator generates a first pulse width modulation... Agent: Hayes Soloway P.C.

20090231036 - Amplifier circuit: An amplifier circuit is disclosed that includes a first input terminal; a second input terminal; a first differential amplifier circuit that samples signals input to the first and second input terminals and outputs signals obtained by applying a gain to the sampled input signals having different voltages; and a second... Agent: Dickstein Shapiro LLP

20090231038 - Differential amplifier: A differential amplifier includes a differential amplifier section to generate a current composed of a differential-mode current and a first common-mode current according to a differential-mode component and a common-mode component of an input signal, a common-mode current generator section to generate a common-mode current according to the common-mode component... Agent: Mcginn Intellectual Property Law Group, PLLC

20090231039 - Differential amplifier: A differential amplifier includes a first differential pair formed by transistors of a first conductivity type, to receive input signals and output first differential-mode currents, a first current amplifier section to output a first output source current and a first output sink current to a first output terminal and a... Agent: Mcginn Intellectual Property Law Group, PLLC

20090231040 - Output driver having pre-emphasis capability: An output driver and an I/O apparatus including the output driver are disclosed. The output driver includes a driving unit having a first type transistor and a second type transistor connected in series, the driving unit amplifying an input signal applied to the gates of the first type transistor and... Agent: Volentine & Whitt PLLC

20090231037 - Telescopic operational amplifier and reference buffer utilizing the same: A telescopic operational amplifier including a current source, an input stage, and a load stage is provided. The input stage is coupled to the current source and includes a group of input transistors for receiving an input voltage. The load stage is coupled to the input stage and includes a... Agent: Thomas, Kayden, Horstemeyer & Risley, LLP

20090231041 - Commutating amplifier with wide dynamic range: Variable gain commutating amplifier apparatus and methods for use in a polar modulator are described. The apparatus may include two or more commutating amplifier stages configured to be switched to an output load based on a desired amplitude and/or transmit power level. The amplifier stages may include cross-coupled differential pairs... Agent: Cooley Godward Kronish LLP Attn: Patent Group

20090231042 - broadband power amplifier with a high power feedback structure: A broadband power amplifier using a novel high power feedback structure is disclosed in this patent. Feedback is widely used in amplifier design to broaden the bandwidth of the amplifier. Traditionally, the feedback resistor is either an axial resistor placed over the top of the transistor or a surface mount... Agent: Pengcheng Jia

20090231043 - Distributed amplifier and integrated circuit: A plurality of transistors operate as amplification elements. An input side coupling circuit comprises a plurality of distributed constant lines connected in series, one terminal of which is an input terminal and the other terminal of which is a bias input terminal. Each of the connection nodes between these distributed... Agent: Sughrue Mion, PLLC

20090224824 - Optimized uplink efficiencies for transmission of satellite data: 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... Agent: The Directv Group, Inc. Patent Docket Administration

20090224825 - Output circuit of vacuum-tube amplifier: An output circuit of a vacuum-tube amplifier is disclosed. An output circuit of a conventional vacuum-tube amplifier has shortcomings that a front end amplification unit uses a coupling condenser or a transformer to output an AC signal to an output node, a bias voltage of a cathode of a vacuum... Agent: Joseph Hyosuk Kim, Ph.d. Jhk Law

20090224826 - Output circuit of vacuum-tube amplifier: An output circuit of a vacuum-tube amplifier is disclosed. An output circuit of a conventional vacuum-tube amplifier has shortcomings that a front end amplification unit uses a coupling condenser or a transformer to output an AC signal to an output node, a bias voltage of a cathode of a vacuum... Agent: Joseph Hyosuk Kim, Ph.d Jhk Law

20090224827 - Split-feedback technique for improving load regulation in amplifiers: A circuit arrangement and method for improving load regulation in an amplifier (e.g., LDO amplifier) uses a feedback circuit including a parallely connected feedback resistance Rf and a noise reduction feedback capacitance Cf, wherein an external capacitance has equivalent series resistance (ESR). The circuit arrangement includes a resistance Resr in... Agent: Texas Instruments Incorporated

20090224828 - Distortion compensation amplification device and correction method: A distortion compensation amplification device which supplies a transmission signal while a distortion of the amplified transmission signal is compensated, the distortion compensation amplification device including a correction unit which corrects a carrier leak and an image of the transmission signal based on a correction value. The distortion compensation amplification... Agent: Hanify & King Professional Corporation

20090224829 - Adaptive operational transconductance amplifier load compensation: A buffer varies the size of its output stage in response to a varying capacitive load. The capacitive load may vary in a predictable or a random manner. The buffer includes an operational amplifier having an output stage of multiple transistors, selectively connected in parallel. During operation, data regarding the... Agent: Ratnerprestia

20090224830 - Two-stage operational amplifier with class ab output stage: An operational amplifier includes a differential amplifier including an active load, a current mirror including a first branch and a second branch, a first switch connected between a first power source and an output node and switched in response to a voltage of a first output terminal of the differential... Agent: F. Chau & Associates, LLC

20090224831 - Cancellation of common mode oscillation in rf circuits: A multistage RF amplifier amplifies RF signals used for communication in a WLAN communications system. The multistage RF amplifier comprises a first amplifier circuit coupled to a second amplifier circuit to maximize amplification. A common mode of the first amplifier circuit is coupled to a common mode of the second... Agent: Sawyer Law Group LLP

20090224833 - Amplifier: An amplifier comprising a digitally pre-distorted Laterally Diffused Metal Oxide Semiconductor (LDMOS) transistor and a biassing circuit is described. The gate bias voltage defines an operating point of the LDMOS transistor such that the quiescent drain current of the LDMOS transistor is substantially invariant when an input signal of varying... Agent: Howard & Howard Attorneys PLLC

20090224832 - System and method of enabling a signal processing device in a relatively fast manner to process a low duty cycle signal: A system and method of improving the power efficiency of a receiver for low duty cycle applications. In one aspect, the receiver includes a low noise amplifier (LNA) that is capable of being enabled in a relatively quick fashion so as to amplify an incoming signal when needed, and then... Agent: Qualcomm Incorporated

20090224834 - Switched capacitor voltage converter for a power amplifier: A voltage converter includes a plurality of capacitors and corresponding first switch elements, the capacitors coupled in series and arranged to each charge to a voltage level during a first clock period, the voltage level determined by a supply voltage level, the number of capacitors and a value of each... Agent: Smith Frohwein Tempel Greenlee Blaha LLC

20090224835 - High speed preamplifier circuit, detection electronics, and radiation detection systems therefrom: A preamplifier circuit for processing a signal provided by a radiation detector includes a transimpedance amplifier coupled to receive a current signal from a detector and generate a voltage signal at its output. A second amplification stage has an input coupled to an output of the transimpedance amplifier for providing... Agent: Akerman Senterfitt

20090219086 - Amplifier, amplifying method, and filter: An amplifier is provided which includes: a first variable capacitance device of which capacitance is variable, a second variable capacitance device of which capacitance is variable, electrically connected to the first variable capacitance device, and of an inverse conductivity type from the first variable capacitance device, and a first input... Agent: Finnegan, Henderson, Farabow, Garrett & Dunner LLP

20090219087 - Travelling wave amplifier: A travelling wave amplifier has two inductive transmission lines (12,14) with a plurality of amplifier devices (10) connected between them. At least one of the transmission lines (14) further comprises a plurality of delay elements (50), each delay element being provided in series between a respective pair of inductive elements.... Agent: Scully Scott Murphy & Presser, PC

20090219088 - Apparatus and method for correcting non-linear distortion based on characteristic modeling of high power amplifier: An apparatus for correcting a non-linear distortion includes a pre-distorter for pre-distorting a transmit signal inputted from an external apparatus based on pre-distortion characteristics outputted from a pre-distortion characteristic predictor; a modulator for modulating the pre-distorted signal to thereby generate a modulated signal; a frequency up-converter for up-converting a frequency... Agent: Cantor Colburn, LLP

20090219089 - Amplifier arrangement and method: An amplifier arrangement having a transistor arrangement comprising a first transistor (1) in common-emitter configuration and a second transistor (2) in common-base configuration. A switching device (7) couples, in a first mode of operation, the first transistor (1) to an input (3) of the amplifier arrangement and while the second... Agent: Cohen, Pontani, Lieberman & Pavane LLP

20090219090 - Output dc offset protection for class d amplifiers: A class D amplifier with output DC offset protection is disclosed. The DC offset protection receives a PWM input signals from the outputs and investigates the PWM output signals whether there is a large DC voltage difference is being reflected on the speaker load. If so, shutdown signal SD will... Agent: Greenblum & Bernstein, P.L.C

20090219092 - Highly linear differential amplifier with a novel resistive source degeneration network: There is provided a highly linear differential amplifying circuit. The highly linear differential amplifying circuit includes: a differential amplifying unit including a main differential amplifying unit having a differential pair of transistors for amplifying a difference of two input signals and an auxiliary amplifying unit connected in parallel with the... Agent: Foley And Lardner LLP Suite 500

20090219091 - System and method for measuring the output of a photodetector: A system for measuring the output of a photodetector is disclosed. An integrating amplifier circuit receives a signal output from the photodetector and is adapted to output an integrating amplifier voltage proportional to the signal output from the photodetector. A reference source is adapted to serve as a voltage source... Agent: Connolly Bove Lodge & Hutz, LLP

20090219093 - Amplifier with active inductor: An amplifier comprises an amplifier stage and an active inductor. The amplifier stage has an input terminal and an output terminal. The active inductor comprises first and second resistors and first and second transistors. The first resistor has a first terminal coupled to the output terminal of the amplifier stage,... Agent: Freescale Semiconductor, Inc. Law Department

20090219094 - Differential amplifier circuit and frequency mixer for improving linearity: A differential amplifier circuit and a frequency mixer for improving linearity are disclosed. The disclosed differential amplifier circuit includes first and second loads, a first output terminal for the first load, a second output terminal for the second load, a differential amplifying stage including a differential stage for amplifying a... Agent: LexyoumeIPGroup, LLC

20090219095 - Operational transconductance amplifier (ota): Apparatus and methods provide an operational transconductance amplifier (OTA) with one or more self-biased cascode current mirrors. Applicable topologies include a current-mirror OTA and a folded-cascode OTA. In one embodiment, the self-biasing cascode current mirror is an optional aspect of the folded-cascode OTA. The self-biasing can advantageous reduce the number... Agent: Knobbe Martens Olson & Bear LLP

20090219096 - Open loop dc control for a transimpedance feedback amplifier: A transimpedance amplifier having open-loop DC control is provided. The open-loop feedback control may provide a DC bias that is configurable based on the characteristics of an input device, such as, a photodiode or a magnetoresistor. The open-loop feedback control may provide quick recovery from voltage level variations and may... Agent: Ropes & Gray LLP

20090219097 - Device and method for amplifying radiocommunication signals: The present invention relates to a method for amplifying radiocommunication signals via a string (401) of amplifiers (412) associated with a gain controller (413) receiving an amplification setpoint (Vatt) of constant value (Vfgm), in order to produce an amplification of constant gain (FGM) or of variable value (Valc), in order... Agent: Lowe Hauptman & Berner, LLP

20090219098 - Method and system for polar modulation with discontinuous phase for rf transmitters with power control: Aspects of a method and system for polar modulation with discontinuous phase for RF Transmitters with power control may include performing by one or more circuits comprising a plurality of amplifiers, configuring one or more of the plurality of amplifiers to provide a coarse amplitude gain and a power level... Agent: Mcandrews Held & Malloy, Ltd