Amplifiers inventions 07/08

20080180167 - Modulated triangular wave amplifier: The invention is a power amplifier circuit for providing a signal acceptable for use in audio amplifiers or similar applications without requiring a stable power supply free from fluctuations. An alternating current power supply signal rectified to a direct current signal is processed by two voltage multipliers. A voltage divider... Agent: Storm LLP

20080180166 - Sigma-delta modulator with feedback for power amplifiers: The invention concerns an electronic circuit comprising a sigma-delta modulator and a power amplifier connected downstream thereof, wherein there is provided a feedback circuit (207) which is coupled between an output of the sigma-delta modulator and an input of the sigma-delta modulator and which includes an emulation of the signal... Agent: Ware Fressola Van Der Sluys & Adolphson, LLP

20080180168 - Amplifier, transmitter arrangement having an amplifier and method for amplifying a signal: An amplifier includes a signal input, a first, second and third amplification path. A coupling element having a first and a second output terminal is coupled to respective input terminals of the first and second amplification paths, and is coupled with a third terminal to an input terminal of the... Agent: Eschweiler & Associates LLC

20080180169 - Multimode amplifier for operation in linear and saturated modes: According to an exemplary embodiment, a multimode power amplifier configured to receive an RF input signal and provide an RF output signal in linear and saturated operating modes includes an output stage configured to receive a fixed supply voltage and to provide the RF output signal. The multimode power amplifier... Agent: Farjami & Farjami LLP

20080180171 - System and method for combining stepped drain bias control with digital predistortion for a power amplifier: The present disclosure relates generally to systems and methods for combining stepped drain bias control with digital predistortion for a power amplifier. In one example, the method includes receiving an input associated with a transmit power level of a transmitter in a wireless terminal and selecting a predefined drain bias... Agent: Timothy F. Bliss

20080180170 - System and method for controlling radio frequency transmissions from an electronic device: The invention relates to a system and method for attenuating harmonics in output signals. In the system, an electronic circuit for reducing harmonics of an output signal from a power amplifier in a transmission circuit for a wireless communication device is provided. The circuit comprises: a printed circuit board (PCB);... Agent: Mccarthy Tetrault LLP

20080180172 - Low rf interference switching amplifier and method: A switching amplifier includes first and second output terminals that may be connected to a load. A pulse-width modulator receiving an input signal to obtain respective positive and negative values of the input signal. The modulator is connected to first and second switching circuits. The first switching circuit applies a... Agent: Karen Lenaburg, Esq. Dorsey & Whitney LLP

20080180173 - Differential signal comparator: There is provided a differential signal comparator which maintains the duty ratio of complementary input signals. The differential signal comparator includes differential amplifier circuits 1 and 2 receiving complementary input signals, a plurality of current amplifier circuits 3 to 6 for amplifying current output from the differential amplifier circuits and... Agent: Fitzpatrick Cella Harper & Scinto

20080180174 - Output buffer with a controlled slew rate offset and source driver including the same: Example embodiments relate to an output buffer having a differential input circuit configured to convert a differential voltage signal input through a positive input terminal and a negative input terminal into a differential current signal, and configured to output the differential current signal. The differential input circuit may include a... Agent: Lee & Morse, P.C.

20080180175 - Variable gain amplifier and control method thereof: A variable gain amplifier has a first amplifier circuit (106) having a first field-effect transistor and amplifying a signal input to a gate of the first field-effect transistor to output; a gate bias control circuit (102) controlling a gate bias of the first amplifier circuit to control a gain of... Agent: Arent Fox LLP

20080180176 - Sequential bias-controlled high power amplifier apparatus and method: A bias-controlled high power amplifier apparatus and method is provided. The apparatus includes a controller, a switching unit, and a power amplifier. The controller supplies a gate voltage of a power amplifier and after a delay for a predetermined time period, supplies a power source to a switching unit. The... Agent: Docket Clerk

20080180177 - Methods and apparatus to detect impedance at an amplifier output: Methods and apparatus to detect impedance at an amplifier output are described. In one example, a method of determining a relative value of an amplifier output load may include determining a current provided to the amplifier output load in response to an input signal; determining a current provided to a... Agent: Texas Instruments Incorporated

20080180178 - Power amplifier with an output matching network: Provided herein is a power amplifier having a multiple stage power amplifier section and an output matching network section. The multiple stage power amplifier section can include multiple power amplifier stages with interstage matching circuits located therebetween. The output matching network can be configured to match the multiple stage power... Agent: Orrick, Herrington & Sutcliffe, LLPIPProsecution Department

20080180179 - Rf power amplifier stability network: A radio frequency (RF) generator for applying RF power to a plasma chamber includes a DC power supply (B+). A radio frequency switch generates the RF power at a center frequency f0. A low-pass dissipative terminated network connects between the DC power supply (B+) and the switch and includes operates... Agent: Harness, Dickey & Pierce, P.L.C

20080174365 - Power amplifier time-delay invariant predistortion methods and apparatus: An embodiment of the invention is a time-delay invariant predistortion approach to linearize power amplifiers in wireless RF transmitters. The predistortion architecture is based on the stored-compensation or memory-compensation principle by using a combined time-delay addressing method, and therefore, the architecture has an intrinsic, self-calibrating time-delay compensation function. The predistortion... Agent: Law Offices Of James E. Eakin

20080174366 - Low distortion switching amplifier circuits and methods: Embodiments of the present invention include switching amplifier circuits and methods. In one embodiment, the present invention includes an low distortion method of driving a switching amplifier comprising generating a first pulse width modulated signal on a first terminal, generating a second pulse width modulated signal on a second terminal,... Agent: Fountainhead Law Group, Pc

20080174367 - Tail-current steering circuit and method for rail-to-rail operational amplifier input stage: An amplifier includes first and second pairs of differentially coupled input transistors. The first current mirror generates a reference current which is mirrored by a second current mirror to produce a mirrored reference current. Current steering circuitry steers the mirrored reference current as a first tail current through the first... Agent: Texas Instruments Incorporated

20080174368 - Electron turbulence damping circuit for a complimentary-symmetry amplification unit: An electron turbulence damping circuit (40) for a complimentary-symmetry unit (10′) includes a first output device (12′) having a first conductivity and a second output device (14′) having a second conductivity that is opposite the conductivity of the first output device (12′). A common load connector (28′) is secured in... Agent: Malcolm J. Chisholm, Jr. Attorney At Law

20080174369 - High speed, high current gain voltage buffer and method: An amplifying circuit which may be useful in a diamond buffer amplifier or operational amplifier includes an input transistor including an emitter, a collector, and a base coupled to receive an input voltage. An adjustable current source circuit is coupled between a first reference voltage and the emitter of the... Agent: Texas Instruments Incorporated

20080174371 - Layout of power device: A layout of a power device is provided. The layout includes a substrate, a unit array, a plurality of first, second, third and fourth signal paths, and a first, second, third and fourth port. The unit array with a plurality of rows is disposed on the substrate. Each row of... Agent: J C Patents, Inc.

20080174370 - Systems and methods for high frequency electronic power conversion and amplification: An electronic power amplifier includes a plurality of cells, each cell comprising a DC input port for accepting a DC input power from a voltage source VG, an AC input port for accepting an AC signal S1 at a frequency FS and having a first magnitude M1, a switching mechanism... Agent: General Electric Company Global Research

20080174372 - Multi-stage amplifier with multiple sets of fixed and variable voltage rails: A signal processing system and method utilizes a multi-stage amplifier to amplify an input signal. The multi-stage amplifier uses a mixed set of voltage rails to improve the operating efficiency of at least one of the amplification stages while allowing other amplification stages to operate in a predetermined operating mode.... Agent: Hamilton & Terrile, LLP

20080169874 - Tunable microwave devices with auto-adjusting matching circuit: An embodiment of the present invention provides an apparatus, comprising a power amplifier with a tunable impedance matching circuit including a plurality of tunable dielectric varactors and a DC voltage source interface capable of providing voltage to said plurality of saud tunable dielectric varactors.... Agent: James S. Finn

20080169875 - 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

20080169876 - Method of forming an operational amplifier and structure therefor: In one aspect, an operational amplifier is configured to form a quiescent current that is a ratio of a current of a current source of the operational amplifier and to provide a load current to a load that is not ratioed to the current of the current source.... Agent: Mr. Jerry Chruma Semiconductor Components Industries, L.L.C.

20080169877 - Amplifier for use in radio-frequency band: A cascode-connected transistor includes a common-source transistor which receives an input signal, and a common-gate transistor which is connected to a drain terminal of the common-source transistor and outputs an output signal. A band-pass filter receives the output signal of the cascode-connected transistors. An adjustment circuit is interposed between the... Agent: Mcdermott Will & Emery LLP

20080164940 - Miltiple output power mode amplifier: A multi-mode power amplifier and an electronic device including the amplifier are described.... Agent: Kathy Manke Avago Technologies Limited

20080164941 - Systems and methods for power amplifiers with voltage boosting multi-primary transformers: Systems and methods may be provided for a power amplifier system. The systems and methods may include a plurality of power amplifiers, where each power amplifier includes at least one output port. The systems and methods may also include a plurality of primary windings each having a first number of... Agent: Sutherland Asbill & Brennan LLP

20080164942 - Audio data processing apparatus, terminal, and method of audio data processing: According to an aspect of the invention, there is provided an audio data processing apparatus including: a decoding unit configured to extract an encoding parameter from encoded audio data by decoding the encoded audio data; an acquisition unit configured to acquire a background noise signal; a correction gain calculating unit... Agent: Frishauf, Holtz, Goodman & Chick, PC

20080164943 - Predistortion device based on vector envelope injection and the method thereof: The present invention discloses a predistortion method based on vector envelope injection. Said method includes the following steps: radio frequency input signals are divided into two signal streams; one input signal stream generates two envelope injection signals whose amplitudes can be adjusted independently; the other signal stream is divided into... Agent: Sughrue Mion, PLLC

20080164944 - Protection and automatic recovery circuit system: The circuit system contains an output control circuit, an output stage circuit, a current sensing circuit, and a delay circuit. The output stage circuit is driven by the output control circuit and monitored by the current sensing circuit. When the current sensing circuit determines that there is a short circuit... Agent: Leong C Lei

20080164945 - Simple operational amplifiers circuit and alternative circuit of latch circuit: A simple operational amplifier (OP amp) and an alternative circuit of a latch circuit constructed by a Bipolar Junction Transistor (BJT) or a Metal-Oxide Semiconductor Field Effect Transistor (MOSFET) are provided to obtain a higher output ability (higher input/output voltage and output circuit).... Agent: Troxell Law Office PLLC Suite 1404

20080164946 - Coupling net and mmic amplifier: Microwave coupling network comprising a passive resistive pi net and a coupling capacitor is coupled to a branching point. The branching point is coupling to respectively a plurality of common drain FET amplifier stages or respectively to common collector BJT amplifier stages, wherein respectively the source, or respectively the emitter,... Agent: Ericsson Inc.

20080164947 - Semiconductor device: Power amplifier circuits which constitute an RF power module used for a digital device capable of handling high frequency signals in two frequency bands are disposed over the same IC chip. The power amplifier circuits are disposed around the IC chip, and a secondary circuit is disposed between the power... Agent: Stanley P. Fisher Reed Smith LLP

20080164948 - Biasing current to speed up current mirror settling time: A current mirror circuit includes a first current-mirror transistor coupled to a second current-mirror transistor. A load is coupled to the second current-mirror transistor. A first current source is coupled to the first current-mirror transistor to cause a bias current to flow through the first current-mirror transistor and a second... Agent: Lewis And Roca, LLP

20080164949 - Wideband linearization and adaptive power management for microwave power amplifiers: A power amplifier includes a bipolar transistor and a self-adaptive bias network situated between an RF input and the base of the bipolar transistor. The self-adaptive bias network suppresses the low frequency even-order intermodulation components. The self-adaptive bias network stabilizes a DC bias voltage to provide a substantially constant base-emitter... Agent: Heslin Rothenberg Farley & Mesiti PC

20080157871 - Predistortion linearization device with adjustable amplitude and shape: A predistortion linearization device (D) produces gain and phase expansions making it possible to compensate for the gain compression and phase variation of a power amplifier. This device (D) also allows the conventional adjustment of amplitude, the adjustment of the form of the gain and phase expansions as a function... Agent: Lowe Hauptman & Berner, LLP

20080157869 - Strategic predistortion function selection: A corrective predistortion function is applied to a signal to compensate for or cancel out distortion that is introduced by a component that processes the signal. A disclosed example includes applying a corrective predistortion function to a transmitted signal used for wireless communications. A technique for selecting the corrective predistortion... Agent: Carlson, Gaskey & Olds, P.c./alcatel-lucent

20080157870 - Strategically selecting data captures for signal predistortion: An approach for determining corrective predistortion functions includes maintaining a history of recent estimations of a plurality of corrective predistortion functions. Each of those functions corresponds to a respective signal characteristic. By determining a feature of each of those functions from the history, one of the corrective predistortion functions is... Agent: Carlson, Gaskey & Olds, P.c./alcatel-lucent

20080157872 - Current switched circuit for switch mode power amplifiers: Disclosed is a switch mode power amplifier that provides high power (e.g., 100 W) at a high frequency (e.g., microwave frequency range). The switch mode power amplifier includes a load resistor, an inductor-capacitor (LC) circuit connected in parallel with the load resistor, a first switching mechanism connected to a first... Agent: Weinick & Associates, Llc

20080157873 - Fully differential amplification device: An auxiliary current source is provided that includes MOS transistors feeding startup auxiliary current to the input portion of an output common mode voltage generation circuit amplifying the output of a differential amplifier and generating an output common voltage, and a correction current source is provided that includes MOS transistors... Agent: Dickinson Wright Pllc

20080157874 - Dynamic bandwidth compensating method and associated apparatus: where β is a feedback factor determined by the resistance of the resistors and A(s) is an open-loop gain of the operational amplifier. The operational amplifier includes a first-stage amplifying circuit, a second-stage amplifying circuit, and a compensating capacitor coupled to an output end of the first-stage amplifying circuit and... Agent: Kirton And Mcconkie

20080157875 - Method and system for precise current matching in deep sub-micron technology: Aspects of a method and system for precise current matching in deep sub-micron technology may include adjusting a current mirror to compensate for MOSFET gate leakage currents by using feedback circuits. The feedback circuits may be implemented from active components to create active feedback circuits. If the reference current to... Agent: Mcandrews Held & Malloy, Ltd

20080157876 - Low strain variable frequency amplifier: A variable frequency amplifier suffering less deterioration of strain characteristic and capable of operating at plural frequencies is disclosed. In one aspect, a changeable amplifier comprises an amplifying element, a changeable matching circuit disposed at an input side of the amplifying element and including a first variable capacity element connected... Agent: Knobbe Martens Olson & Bear LLP