Amplifiers inventions 08/08

20080204131 - Vacuum tube replacement device, circuit and system: A system is provided for a solid-state implementation of a vacuum tube replacement device. The system may derive power from a target amplifier filament supply. The system may include active or passive functions for noise reduction, voltage isolation, servo biasing, and other functions. The vacuum tube replacement device is pin-for-pin... Agent: Merchant & Gould PC

20080204132 - Class-d amplifier: The present invention relates to a class-D amplifier having a pre-processing unit (13). The pre-processing unit is arranged to limit the signal inputted to the amplifier when the amplifier switching frequency drops in order to avoid disturbances occurring when the switching frequency cuts through the amplifier output filter. To this... Agent: Philips Intellectual Property & Standards

20080204133 - Circuits and apparatus to reduce transient output noise in an audio amplifier: Circuits and apparatus to reduce transient output noise in an audio amplifier are disclosed. A disclosed example apparatus comprises an amplifier, and an amplifier controller to digitally change a common-mode voltage of the amplifier to reduce an output noise of the amplifier.... Agent: Texas Instruments Incorporated

20080204134 - Power combiner: A third preferred embodiment provides a power combiner consisting of a plurality of co-axial transmission lines of equal length and having equal characteristic impedance. The input end of the inner conductor of each of the co-axial transmission line is adapted to receive a power amplifier output impedance from an associated... Agent: Stallman & Pollock LLP

20080204135 - Method and system for low noise amplifier (lna) gain adjustment through narrowband received signal strength indicator (nrssi): A method for processing a plurality of signals may include amplifying an input signal and generating a wideband signal from the amplified input signal. The method may further include bandpass filtering the generated wideband signal to generate a narrowband signal, and adjusting amplification of the input signal based on a... Agent: Mcandrews Held & Malloy, Ltd

20080204136 - Distortion compensation apparatus: A distortion compensation apparatus includes an amplifier for amplifying an input signal, a calculation unit for obtaining a distortion compensation coefficient of the amplifier corresponding to an amplitude level of the input signal, based on the input signal input to the amplifier and an output signal output from the amplifier,... Agent: Bingham Mccutchen LLP

20080204137 - Design structure for a serial link output stage differential amplifier: A design structure embodied in a machine readable storage medium for designing, manufacturing, and/or testing a design for protection for the transmission of higher amplitude outputs required of differential amplifiers formed by thin oxide transistors with limited maximum voltage tolerance used where compliance with communication protocol standards requires handling voltages... Agent: Ibm Corporation, Intellectual Property Law Dept 917, Bldg. 006-1

20080204138 - Fully differential amplifier with continuous-time offset reduction: A fully differential amplifier circuit according to one embodiment includes a first section for generating first and second output signals on first and second outputs from first and second input signals; a first feedback loop coupled to the first section, the first feedback loop including a second section for adjusting... Agent: Zilka-kotab, PC

20080204139 - Reconfigurable distributed active transformers: Reconfigurable distributed active transformers are provided. The exemplary embodiments provided allow changing of the effective number and configuration of the primary and secondary windings, where the distributed active transformer structures can be reconfigured dynamically to control the output power levels, allow operation at multiple frequency bands, maintain a high performance... Agent: Mr. Christopher John Rourk Jackson Walker LLP

20080204140 - Compound semiconductor device and doherty amplifier using compound semiconductor device: A lower electron supply layer is disposed over a lower electron transport layer made of compound semiconductor. The lower electron supply layer is made of n-type compound semiconductor having an electron affinity smaller than that of the lower electron transport layer. An upper electron transport layer is disposed over the... Agent: Kratz, Quintos & Hanson, LLP

20080204141 - Radio-frequency amplifier system: A device for measuring voltage levels includes a root mean square (RMS) detector. The RMS detector includes a linear multiplier, a log converter, a low-pass filter and a temperature compensator. The linear multiplier multiplies a voltage of an input signal by the voltage of the input signal. The low-pass filter... Agent: Baker Botts L.L.P.

20080204142 - Low noise amplifier: A low noise amplifier includes a main amplifier configured to amplify a first input signal to generate a first output signal and an auxiliary amplifier configured to amplify a second input signal to generate a second output signal. The auxiliary amplifier is coupled to the main amplifier for superposing the... Agent: Volentine & Whitt PLLC

20080204144 - Input stage for an amplifier: In one embodiment, the present invention includes an amplifier having an input to receive a radio frequency (RF) signal from an output node of a source. An input stage coupled to the amplifier input may include one or more components to aid in processing of incoming signals. One such component... Agent: Trop Pruner & Hu, PC

20080204143 - Wide dynamic range amplifier gain control: Linear wide dynamic range variable gain amplifiers can be configured using a variable gain amplifier having an abbreviated gain control range in combination with a discrete attenuator controlled to select an attenuation from a predetermined set of attenuation values. The variable gain amplifier is configured to provide substantially linear gain... Agent: Townsend And Townsend And Crew, LLP

20080204145 - Bias control circuit and method of controlling bias of rf power amplifier: A bias control circuit for an RF amplifier having an output device for providing an output signal to a load and a driver device for driving the output device includes a current mirror circuit for providing a driver device bias current to the driver device and an output device bias... Agent: Kathy Manke Avago Technologies Limited

20080204146 - Wireless communication unit, integrated circuit and biasing therefor: A wireless communication unit comprises a semiconductor power amplifier device and a bias control circuit therefor. The bias control circuit comprises a detector for detecting at least a portion of the RF input signal; and a buffer for buffering the detected RF input signal. The detector is arranged to provide... Agent: Freescale Semiconductor, Inc. Law Department

20080204147 - Method and system for power amplifier (pa) with on-package matching transformer: Aspects of a system for a power amplifier with an on-package matching transformer may include a DC/DC converter that enables generation of a bias voltage level within an IC die based on an amplitude of an input signal to a PA circuit within the IC die. The bias voltage level... Agent: Mcandrews Held & Malloy, Ltd

20080204148 - Amplifier with integrated filter: An amplifier with integrated filter (e.g., an LNA) is described. In one design, the amplifier may include a gain stage, a filter stage, and a buffer stage. The gain stage may provide signal amplification for an input signal. The filter stage may provide filtering for the input signal. The buffer... Agent: Qualcomm Incorporated

20080204149 - Cryogenic receiving amplifier and amplifying mehtod: The present invention discloses a cryogenic receiving amplifier using a gallium nitride high electron mobility transistor (GaN HEMT) as an amplifying device in a cryogenic temperature environment. The cryogenic receiving amplifier includes an input matching circuit which makes an impedance matching between a gate of the amplifying device and an... Agent: Oblon, Spivak, Mcclelland Maier & Neustadt, P.C.

20080197920 - Arrangement for carrying out current-to-voltage conversion: An arrangement for carrying out current-to-voltage conversion, preferably for an infrared receiver, in which the static offset, which has an interfering effect with regard to sensitivity or malfunctions, is reduced during the carrying out of current-to-voltage conversion of received input pulses. In this arrangement, outputs of a second stage are... Agent: Heslin Rothenberg Farley & Mesiti PC

20080197921 - 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

20080197922 - Amplifier device for an antenna operable in at least one mode: An amplifier device for a mode antenna has a number of amplifiers and a number of outputs. An input signal is fed to each amplifier, which is amplified by the respective amplifier into an amplified input signal. The amplified input signals are fed to an output matrix arranged after the... Agent: Schiff Hardin, LLP Patent Department

20080197923 - Semiconductor integrated circuit device and high-frequency power amplifier module: Upon application of an on-state voltage to a control terminal, an antenna switch provided between an antenna terminal and a transmission terminal is turned on, and a transmission signal of a PCS/DCS system passes from the transmission terminal through the antenna terminal. At this time, a booster circuit, to which... Agent: Mattingly, Stanger, Malur & Brundidge, P.C.

20080197924 - Variable gain amplifier circuit and filter circuit: This variable gain amplifier is provided with an operational amplifier. The non-inversion input terminal of the operational amplifier is connected to a reference potential. A feedback resistor is connected between the output terminal and inversion input terminal of the operational amplifier. An input resistor is inserted between the inversion input... Agent: Hanify & King Professional Corporation

20080197925 - Distortion compensation amplifying apparatus: In an amplifying apparatus performing distortion compensation by imparting pre-distortion, a table for distortion compensation is efficiently updated for improving the accuracy of distortion compensation even when the frequency of occurrences of levels near a peak of an input signal is low. Compensation values in a distortion compensation table 2... Agent: Oliff & Berridge, PLC

20080197926 - Source follower circuit and semiconductor apparatus: Based on a result of comparing an output common mode direct-current voltage of a pair of source follower transistors when a direct-current voltage is applied to each gate of the pair of source follower transistors with a predetermined reference voltage, the direct-current voltage is controlled such that the output common... Agent: Katten Muchin Rosenman LLP

20080197927 - Constant bandwidth dc offset correction in an amplifier: According to one embodiment, a system for constant bandwidth DC offset correction in an amplifier includes a number of amplifier stages having an input and an output coupled together in series. The system for constant bandwidth DC offset correction further includes a number of DC offset correction feedback loops which... Agent: Michael Farjami, Esq. Farjami & Farjami LLP

20080197928 - Threshold voltage compensation for a two stage amplifier: In an example embodiment, an apparatus, such as a two stage operational amplifier, comprising a first stage amplifier having an input and an output, and a second stage amplifier having an input and an output, the input of the second stage amplifier is coupled to the output of the first... Agent: Tucker Ellis & West LLP

20080197929 - Resonant types of common-source/common-emitter struture for high gain amplification: Radio frequency/millimeter wave integrated circuits (RF/MMICs) that employ a resonance mechanism between an input stage and a transistor are disclosed. The circuits contain an input stage, a transistor; and a transformer connected between either a gate or a base of the transistor and a voltage supply of the input stage.... Agent: Ladas & Parry

20080197930 - Digital amplifier: Recently, the use of class D audio amplifiers has become more and more widespread. In contrast to the generally employed class A-B linear amplification technology, class D allows for improved efficiency. However, the class D principle is known for its poor distortion characteristics. According to the present invention, a digital... Agent: Nxp, B.v. Nxp Intellectual Property Department

20080191800 - Dual-chopper amplifier and its usage as readout circuit for capacitive sensors: Low-noise, high-dynamic-range readout circuits with reduced power dissipation for capacitive sensors having small sensing capacitance and low transducer sensitivity are provided by combining a mixed modulation clock and a dual-chopper amplifier (DCA) circuit. The mixed modulation clock is generated by an exclusive-OR (XOR) of a high frequency clock and a... Agent: Mh2 Technology Law Group, LLP

20080191801 - Doherty amplifying apparatus using a harmonic control circuit: A Doherty power amplifying apparatus includes a harmonic-controlled Doherty amplifier; and an input matching unit and an output matching unit for input matching and output matching the harmonic-controlled Doherty amplifier, respectively. The harmonic-controlled Doherty amplifier includes a carrier amplifier; a peaking amplifier arranged in parallel to the carrier amplifier; and... Agent: Bacon & Thomas, Pllc

20080191802 - Low voltage operational transconductance amplifier circuits: Circuits that operate with power supplies of less than 1 volt are presented. More particularly, circuits that operate with supply voltages (VDD) near or lower than the threshold voltage of the transistors (310, 312, etc.) in those circuits are presented. Various circuits and embodiments such as operational transconductance amplifiers (346),... Agent: Wilmerhale/columbia University

20080191803 - Variable gain amplifying circuit: A variable gain amplifying circuit comprises two stages, a first stage and a second stage with a common voltage-to-current converter. Each stage comprises two BJTs, two voltage controlled current sources, a variable resistor with a variable resistance, and the common voltage-to-current converter. The two BJTs construct a differential amplifier for... Agent: Madson & Austin

20080191804 - 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

20080191805 - Electronic circuit and method for manufacturing an electronic circuit: The invention relates to an electronic circuit comprising a first terminal (100) and a second terminal (200, 300) and at least three transistors (1) arranged in parallel, each transistor having a control terminal (2) connected to said first terminal (100) for receiving a control signal, and an output terminal (3,... Agent: Harness, Dickey & Pierce, P.L.C

20080191806 - High frequency power amplifier circuit, high frequency power amplifier electronic component and method thereof: A high frequency power amplifier electronic component (RF power module) is so constituted as to apply bias to an amplifier FET in current mirror configuration. In this RF power module, deviation of a bias point due to the short channel effect of the FET is corrected, and variation in high... Agent: Mattingly, Stanger, Malur & Brundidge, P.c.

20080191807 - Signal converter having compensation unit: A signal converter includes a signal converting unit and a compensation unit. The signal converting unit generates intermediate differential signals at intermediate nodes in response to a single-ended signal. The compensation unit generates compensated differential signals at output nodes by minimizing phase and amplitude mismatch errors between the intermediate differential... Agent: Law Office Of Monica H Choi

20080186089 - Power amplifier: A power amplifier is disclosed. In one embodiment, the power amplifier is a Class-D Amplifier having a differential pulse width modulator is disclosed. The differential pulse width modulator has an input for receiving an input signal, a first output for outputting a first signal and a second output for outputting... Agent: Dicke, Billig & Czaja

20080186090 - Audio system with power-on/off noise suppression and audio amplifier thereof: An audio system with power-on/off noise suppression and an audio amplifier thereof are disclosed. The audio system includes a front stage circuit and an audio amplifier. The front stage circuit is powered by a first supply voltage and outputs an audio signal. The audio amplifier amplifies the audio signal to... Agent: Jianq Chyun Intellectual Property Office

20080186091 - Dual transconductance amplifiers and differential amplifiers implemented using such dual transconductance amplifiers: Various systems and methods for signal amplification are disclosed. For example, some embodiments of the present invention provide differential amplifiers that include dual transconductance characteristics. Such amplifiers include two dual input operational amplifiers that each include two input sets. A first of the input sets exhibits a first transconductance and... Agent: Texas Instruments Incorporated

20080186092 - Shared linearity maintenance in power amplifiers: In some embodiments, a circuit includes a power amplifier including an input terminal configured to receive an input signal and an output terminal to provide an RF voltage, the output terminal coupled to a load, a current sensor configured to sense the current drawn by the power amplifier and provide... Agent: Schwegman, Lundberg & Woessner, P.A.

20080186093 - Switched capacitor amplifier with higher gain and improved closed-loop gain accuracy: A switched capacitor CMOS amplifier uses a first stage non-inverting CMOS amplifier driving a second stage inverting CMOS amplifier. The first stage amplifier is provided with positive feedback to substantially increase the gain of the first stage amplifier. In the described examples, the positive feedback is provided either by connecting... Agent: Edward W. Bulchis, Esq. Dorsey & Whitney LLP

20080186094 - Apparatus for high power amplifier in wireless communication system: An apparatus for a High Power Amplifier (HPA) in a wireless communication system is provided. In one example, the apparatus includes a temperature sensor for determining temperature, a controller for receiving the determined temperature and for controlling a gate bias voltage corresponding to the determined temperature and an amplifier for... Agent: JeffersonIPLaw, LLP

20080186095 - Amplification apparatus: The contents of a distortion compensation table for adjusting a waveform of a signal input to an amplification apparatus are more precisely adjusted to suppress distortion occurring in an output signal. A table value calculation unit exercises adaptive control over compensation data I and Q according to the perturbation method... Agent: Oliff & Berridge, PLC

20080186096 - System and method for distortion cancellation in amplifiers: A distortion cancellation amplifier is described having a main amplifier and an error amplifier. The main amplifier, in response to an input signal, generates an output signal having an amplified signal component and a distortion signal component. The error amplifier is sized and biased to generate, in response to the... Agent: Morgan Lewis & Bockius LLP

20080186097 - Audio power amplifier apparatus: The invention concerns an audio power amplifier apparatus capable of providing at low manufacturing cost extremely low non-linear distortion, even lower than −120 dB, comprising a main power amplifying section (3) the output of which is series connected to a secondary of a coupling transformer T1, in turn connected to... Agent: Roberts Mlotkowski Safran & Cole, P.C.

20080186098 - Circuit to prevent load-induced dc nonlinearity in an op-amp: A circuit for removing non-linearity produced when an amplifier includes a load that results in non-linear current levels is provided. The circuit includes a first transistor element being coupled to one of the differential inputs associated with the amplifier. A second transistor element is coupled to another of the differential... Agent: Gauthier & Connors, LLP

20080186099 - Power amplifier and multistage amplification circuit including same: A bias circuit 22 in a power amplifier 1 is provided with a VBE-controlled voltage source circuit 20 and a Nagata current mirror circuit 21. The Nagata current mirror circuit 21 includes a transistor Tr5 and a transistor Tr6. The transistor Tr5 has its emitter grounded, its base connected to... Agent: Harness, Dickey & Pierce, P.L.C

20080186100 - Variable-gain amplification circuit, receiver and receiver ic: Disclosed herein is a variable-gain amplification circuit, wherein the sources of first and second MOSFETs (Metal Oxide Semiconductor Field Effect Transistors) are tied to a common connection point connected to a current source. An input signal is supplied to the gates of the first and second MOSFETs. The drains of... Agent: Sonnenschein Nath & Rosenthal LLP

20080186101 - Biasing scheme for low-voltage mos cascode current mirrors: A circuit and a method for biasing a compound cascode current mirror (CCCM) that enables high-voltage swing at the output and accurate current mirroring is presented. The CCCM has mirror transistors and cascode transistors which may be of a different technology kind. The drain-source voltage Vds of the mirror transistor... Agent: Texas Instruments Incorporated

20080186102 - Front end for an instrumentation amplifier: An amplifier system includes an instrumentation amplifier arrangement being designed to amplify the difference between two voltage inputs with a defined gain, and to produce a single-ended output referenced to a known reference point. A front end circuit is coupled to the instrumentation amplifier. The front end circuit is configured... Agent: Gauthier & Connors, LLP

20080186103 - Radio frequency application circuit: A radio frequency (RF) application circuit is provided. In the RF application circuit, a pair of bipolar junction transistors (BJTs), instead of N-channel metal-oxide-semiconductor (NMOS) transistors, is composed of a switch-block operated in a reversion saturation region. The RF application circuit is used to serve as either an oscillator or... Agent: Jianq Chyun Intellectual Property Office