Amplifiers inventions 09/07

20070222506 - Op driver with the function of canceling op offset: An operational amplifier driver capable of canceling an offset voltage of an operational amplifier includes the operational amplifier, first to third switches and a capacitor. The operational amplifier has a chopper, first and second input terminals and an output terminal. The first switch receives an input voltage and is connected... Agent: Birch Stewart Kolasch & Birch

20070222507 - Low distortion class-d amplifier: A low distortion class-D amplifier. The amplifier comprises a power supply terminal for receiving power, an amplification stage, and an output stage. The amplification stage receives an input signal and generates a ramp signal. Further more, the amplification stage generates a pulse width modulation signal based on the ramp signal... Agent: Murabito, Hao & Barnes, LLP

20070222505 - Ping-pong auto-zero amplifier with glitch reduction: A ping-pong amplifier with reduced glitching is described. The ping-pong amplifier includes a nulling amplifier coupled to a switching network. The switching network is used to auto-zero a ping amplifier within a ping-pong amplifier. The nulling amplifier drives the output of a ping amplifier to a proper output voltage level... Agent: Honeywell International Inc.

20070222504 - System and method for minimizing dc offset in outputs of audio power amplifiers: An amplifier system receives an input signal and generating therefrom an amplified output signal. The amplifier system is recited as comprising an input stage and an amplifier stage. The input stage is configured to receive the input signal and provide a level-shifted signal that has an average signal level that... Agent: Carr & Ferrell LLP

20070222509 - Amplifier circuit: Provided is a chopper amplifier circuit capable of eliminating an influence of a slew rate of an amplifier and suppressing spike generation to thereby obtain an output signal having little harmonic distortion. The chopper amplifier circuit according to the present invention includes: a first chopper circuit for chopping an input... Agent: Brinks Hofer Gilson & Lione

20070222508 - Multi-mode power amplifier with reduced low power current consumption: A multi-mode RF amplifier is disclosed having high and low output power modes composed of two power paths. When the multi-mode RF amplifier is biased into the high power, HP, mode, substantial power is delivered via both (first and second) paths. While in the low power, LP, mode, power is... Agent: Cesari And Mckenna, LLP

20070222511 - Auto gain controller: A gain-controlled transimpedance amplifier circuit that comprises a first gain unit including an input for receiving a first current and an output, a current source for providing a second current, a second gain unit including an input and an output, a first impedance unit of a first impedance coupled in... Agent: Akin Gump Strauss Hauer & Feld L.L.P.

20070222510 - System and method for operating a feedback network: A method and apparatus are provided for operating a feedback network (300, 400). The method and apparatus operate to combine (240) a feedback signal (IF) and an incoming signal (VIN) to generate an adjusted signal (IADJ) at an input node of an amplifier element (110); amplifying the amplifier input signal... Agent: Posz Law Group, PLC

20070222512 - System and method for im3 reduction and cancellation in amplifiers: Sets of power amplifier branches (which comprise an RF/microwave amplifier stage) are power combined within each stage and each set of power amplifier branches are biased in different classes of operation by bias circuits possessing different impedance characteristics such that the fundamental frequency components present at the output are in-phase... Agent: Nelson Mullins Riley & Scarborough, LLP

20070222513 - Apparatus and method for processing of amplifier linearization signals: A feed-forward amplifier includes a main amplifier having input signals and amplified output signals and an error amplifier for amplifying distortion signals to be added to the amplified output signals of the main amplifier to produce an amplifier output. A pilot tone modulation and recovery circuit modulates a pilot tone... Agent: Wood, Herron & Evans, LLP

20070222514 - Differential difference amplifier: A differential difference amplifier includes a first pair of differential input terminals and a second pair of differential input terminals. The differential difference amplifier has a pair of differential output terminals to output a voltage in relation to a difference between differential voltages at the first pair of differential input... Agent: Finnegan, Henderson, Farabow, Garrett & Dunner LLP

20070222515 - Variable gain amplifier and communication apparatus: A variable gain amplifier is provided that can obtain a wide range of gain variation and suppress the deterioration of linearity when switching between amplifying transistors. The variable gain amplifier includes a plurality of cascode amplifiers each including an amplifying transistor and a plurality of cascode transistors connected in a... Agent: Birch Stewart Kolasch & Birch

20070222516 - Differential amplifier and methods for use therewith: A differential audio amplifier includes a differential input stage for producing an output voltage in response to a differential audio input signal. The differential input stage has a first bias voltage and a second basis voltage. A bias compensation module controls the first bias voltage to be substantially equal to... Agent: Garlick Harrison & Markison

20070222517 - Amplifier: Briefly, one or more embodiments of an amplifier, including example applications, are described.... Agent: Christie, Parker & Hale, LLP

20070222518 - High frequency amplifier circuit and mobile communication terminal using the same: A first FET is inserted in a series position between a signal input terminal and a signal output terminal, while second and third FETs are inserted in a shunt position respectively between the signal input terminal and a ground terminal and between the signal output terminal and a ground terminal.... Agent: Stevens, Davis, Miller & Mosher, LLP

20070222519 - Dynamic bias control in power amplifier: An RF output power amplifier (PA) of a cellular telephone includes first and second Class AB amplifier circuits. If the cellular telephone is to operate in a high power operating mode, then the first amplifier drives the PA output terminal. The power transistor(s) in the first amplifier is/are biased at... Agent: Qualcomm Incorporated

20070222520 - High-frequency power amplifier: A high-frequency power amplifier with a temperature compensation function for power amplifying a high-frequency signal, includes: a power amplifying transistor having an emitter grounded; a high power output bias circuit that supplies a high power output current corresponding to a high power output of the high-frequency power amplifier to the... Agent: Mcdermott Will & Emery LLP

20070222521 - Power amplifier: A power amplifier includes a front-stage amplifier including first and second transistors connected in parallel, and a rear-stage amplifier including a third transistor. The first transistor is biased into near-Class A without a distortion compensation circuit. The second and third transistors are biased into near-Class B with a distortion compensation... Agent: Harness, Dickey & Pierce, P.L.C

20070222522 - Method and apparatus for efficient load biasing: A system for driving a plurality of loads each connected to respective signal terminals and to a shared common load terminal. Multiple conventional signal amplifiers each provide a content signal at one of the signal terminals. The signal amplifiers each have a primary-power upper terminal, to receive a first voltage... Agent: Nvidia C/o Murabito, Hao & Barnes LLP

20070222523 - Multi-stage power amplifier with enhanced efficiency: A multi-stage RF/Microwave power amplifier circuit is provided that is capable of operating efficiently at multiple output power levels. The amplifier comprises first and second amplifying stages, an output impedance matching network connected to the output of first amplifying stage and an interstage impedance matching network connected between the outputs... Agent: Morgan Lewis & Bockius LLP

20070222524 - Antenna amplfier: An antenna amplifier includes at least one input for connecting to an antenna and at least one output for connecting to a receiver, as well as at least one means of signal-level matching positioned between the input and the output. The antenna amplifier improves the noise-to-useful signal ratio, in particular... Agent: Kenyon & Kenyon LLP

20070216476 - Dc offset cancellation circuit and programmable gain amplifier using the same: In a DC offset cancellation circuit, an operational amplifier is provided with an inverse terminal, a non-inverse terminal and an output terminal. A first resistor is connected to the non-inverse terminal. A second resistor connected between the inverse terminal and the output terminal. A DC offset cancellation resistor is connected... Agent: Lowe Hauptman Berner, LLP

20070216478 - Systems and methods for maintaining minimum pulse width during shutdown: Systems and methods for preventing violations of minimum pulse width requirements that may cause damage to PWM amplifiers. One embodiment comprises a digital PWM amplifier that includes shutdown circuitry which is configured to identify blockout intervals during which deassertion of the PWM signals would cause the generation of below-minimum-width pulses... Agent: Law Offices Of Mark L. Berrier

20070216475 - Dynamically accelerated operational amplifier and method thereof: An operational amplifier is dynamically accelerated depending on its internal state. Acceleration is disabled when the internal state indicates a risk of instability. When the internal state of the operational amplifier indicates no risk of instability, the acceleration is turned on to speed up the circuit operation.... Agent: North America Intellectual Property Corporation

20070216477 - Baseband noise reduction: An active circuit includes (a) a first chopper circuit that receives an input signal and a chopping signal of a frequency higher than a base band of the input signal, and that provides a modulated input signal; (b) an amplifier that receives the modulated input signal and that provides an... Agent: Macpherson Kwok Chen & Heid LLP

20070216479 - Amplifier turn-on speedup technique: A method of reducing the settling time of an amplifier includes providing a pre-set voltage on a high gain node of the amplifier when the amplifier is disabled. This pre-set voltage can be slightly less than the regulated voltage. In this manner, when the amplifier is enabled, the high gain... Agent: Bever Hoffman & Harms, LLP Tri-valley Office

20070216480 - Selecting samples for amplifier digital predistortion estimation: The present invention provides a method for selecting samples for digital amplifier predistortion estimation. The method may include accessing a plurality of samples. Each sample includes information associated with an input signal and a corresponding output signal of the amplifier. The plurality of samples includes at least one first sample... Agent: Williams, Morgan & Amerson

20070216481 - Low noise amplifiers for low-power impulse radio ultra-wideband receivers: The present invention is related to low power low noise amplifiers (LNA) including on/off switching capability, which are preferably used for impulse radio (IR) ultra-wideband (UWB) receivers. In the invention a very low power and high-gain Common-Gate Capacitive Cross Coupling Cascaded LNA is proposed, to provide an optimum gain for... Agent: Harness, Dickey & Pierce, P.L.C

20070216482 - High linearity and low noise amplifier with continuously variable gain control: An amplifier, tuner, and method of amplification are provided. The amplifier has a pair of transistors. Each transistor has a control terminal and an output terminal disposed between the transistor and a power supply input. A first network is connected between each power supply input and output terminal. The first... Agent: Brinks Hofer Gilson & Lione

20070216484 - Dc current regulator insensitive to conducted emi: A DC current regulator circuit comprises a first circuit node (32) which is operable to receive an external input voltage. A transistor (M1) has an input, a first leg and a second leg. The first leg of the transistor is isolated from the first circuit node (32). An amplifier (10)... Agent: Bacon & Thomas, PLLC

20070216483 - Differential amplifier stage: A differential amplifier stage includes one active load circuit connected to a pair of cross-coupled transistors that produce a differential signal. The active load circuit controls the rise time of the differential signal. The differential amplifier stage also includes another active load circuit connected to the pair of cross-coupled transistors.... Agent: Hayes Soloway P.C.

20070216485 - Linear variable gain traveling wave amplifier: An integrated circuit including a distributed amplifier is disclosed. The integrated circuit includes a plurality of amplification stages, each stage connected to an input signal and an output signal. At least one amplification stage includes an amplification transistor such as a field effect transistor (FET) having a gate, a source,... Agent: Kathy Manke Avago Technologies Limited

20070216486 - Wideband ultra low noise amplifier: A circuit and method of reducing noise in the circuit comprises a first transistor and an amplifier operatively connected to the first transistor, wherein the amplifier comprises a plurality of transistors and is adapted to amplify an input signal, and wherein the input signal is differentially captured at an output... Agent: Frederick W. Gibb, Iii Gibb & Rahman, LLC

20070210862 - Class-e radio frequency amplifier for use with an implantable medical device: A medical apparatus includes an extracorporeal power source that transmits electrical power via a radio frequency signal to a medical device implanted inside an animal. The extracorporeal power source has a Class-E amplifier with a choke and a semiconductor switch connected in series between a source of a supply voltage... Agent: Quarles & Brady LLP

20070210864 - Signal amplifier: A signal amplifier includes a discrete-variable-gain amplifying unit, a gain of which takes a discrete value and changes stepwise, a linear-variable-gain amplifying unit connected in series to the discrete-variable-gain amplifying unit, a gain of which changes continuously, control-signal outputting means for detecting a level of an output signal from a... Agent: Oblon, Spivak, Mcclelland, Maier & Neustadt, P.C.

20070210859 - Apparatus for and method of biasing a transistor: An apparatus for biasing a transistor, comprising: a controllable bias generator; a test circuit; a digital Mth order differentiator responsive to an output of the test circuit; and a controller responsive to the digital Mth order differentiator for controlling the controllable bias generator; wherein the test circuit is configured to... Agent: Wolf Greenfield & Sacks, P.C.

20070210860 - Method and device for performing offset cancellation in an amplifier using floating-gate transistors: An operational amplifier including: a differential pair of transistors coupled to a pair of input signals; and a pair of floating-gate transistors coupled to the differential pair of transistors, wherein the pair of floating-gate transistors are operable for reducing an offset voltage of the operational amplifier.... Agent: Troutman Sanders LLP

20070210861 - Class d audio amplifier with pwm and feedback: The present invention introduces methods and systems to amplify digital audio signals for driving speakers. First, digital audio signals are converted to PWM audio signals by a liner PWM modulator that is open-loop. Then, PWM audio signals are amplified by a Class D audio amplifier that has at least one... Agent: Perkins Coie LLP Patent-sea

20070210863 - Multi-channel amplifier with reduced overall power emission, and circuit management including same: A multi-channel amplifier has inputs via which input signals can be fed to the multi-channel amplifier. The input signals are amplified into output signals by amplifier channels of an amplification stage of the multi-channel amplifier and then are emitted via outputs of the multi-channel amplifier. An adjustment device is associated... Agent: Schiff Hardin, LLP Patent Department

20070210865 - Method and apparatus for recharging portable electronic devices from audio sources: The invention is a power converter that coverts audio signal energy into a regulated DC power. The invention uses the audio output sources available on most modern transportation systems such as airplanes, trains and busses and converts the electrical output of those sources to an electrical output that can be... Agent: Thomas C. Giannulli

20070210866 - Rf power module: A technique is provided for achieving reduction in size of an electronic device with a power amplifier circuit, while enhancing the performance of the electronic device. An RF power module for a mobile communication device includes first and second semiconductor chips, a passive component, and first and second integrated passive... Agent: Mattingly, Stanger, Malur & Brundidge, P.C.

20070210867 - Class-e radio frequency power amplifier with feedback control: A Class-E power amplifier includes a choke and a switch connected in series between a source of a supply voltage and circuit ground and connected to an inductively coupled coil. An output node of the amplifier is formed between choke and the switch and connected to a transmitter antenna. A... Agent: Quarles & Brady LLP

20070210868 - Differential output circuit with reduced differential output variation: In a differential output circuit, a second amplifier has a positive terminal connected to a second fixed potential and a negative terminal to a fifth switch at a first terminal. First and second switches are connected at a point connected to the fifth switch at a second terminal and to... Agent: Mcdermott Will & Emery LLP

20070210869 - Differential amplifying circuit: Disclosed is a differential amplifying circuit including an amplifying circuit, wherein 1) a drain of a sixth transistor is connected to a drain of an eighth transistor, and a drain of a tenth transistor is connected to a drain of a fourth transistor, and 2) a ratio between a total... Agent: Amin, Turocy & Calvin, LLP

20070210870 - Transconductance stage providing gain control: A transconductance stage providing gain control includes an input stage to convert a first differential input voltage and a second differential input voltage to a first intermediate current and a second intermediate current, respectively. An output stage generates a first output current signal and a second output current signal based... Agent: Sterne, Kessler, Goldstein & Fox P.l.l.c.

20070210871 - Adaptive linear amplifier: The present invention relates to an amplifier and, more particularly, to an adaptive linear amplifier with low power consumption and a high linearity. The adaptive linear amplifier according to the present invention comprises amplification means and a bias controller. The amplification means comprises a main transistor and an auxiliary transistor... Agent: Foley And Lardner LLP Suite 500

20070210872 - Elimination of dummy detector on optical detectors using input common mode feedback: A voltage reference forces a constant voltage at the inputs to an amplifier, thereby negating a need for a dummy detector on the non-active input of the amplifier.... Agent: Fliesler Meyer LLP

20070205827 - Doherty amplifier: A Doherty amplifier is described which comprises: a power splitter (120) having a first output and a second output, wherein the first output is connected to a main power splitter (392) having first and second outputs which differ in phase by 90°; and the second output is connected to an... Agent: Howard & Howard Attorneys, P.C.

20070205828 - Switched mode power amplifier using lumped element impedance inverter for parallel combining: A switched-mode Class F power amplifier is provided for parallel connection with at least one other like amplifier, within a Chireix architecture, for combining the signals output therefrom. An input component includes at least one active device configured to be alternately switched by a signal input thereto to present an... Agent: Marger Johnson & Mccollom, P.C.

20070205829 - Single-ended input to differential-ended output low noise amplifier: A single-ended input to differential-ended output amplifier circuit comprises an amplifier for amplifying an input signal into an amplified signal comprises an input for receiving the input signal; and a first input and a single-ended input to differential-ended output conversion circuit to convert the amplified signal to a differential signal... Agent: Birch Stewart Kolasch & Birch