Amplifiers inventions 09/08

20080231356 - Voltage margining with a low power, high speed, input offset cancelling equalizer: A switched-capacitor circuit that may be used for equalization, but configurable for voltage margining. The switched-capacitor circuit cancels the offset voltage inherent in an amplifier and sets the common mode of an input signal at half the rail voltage. Two capacitors level shift an input signal before being applied to... Agent: Seth Kalson C/o Intellevate, LLC

20080231357 - Method and system for gain control and power saving in broadband feedback low-noise amplifiers: Methods and systems for gain control and power saving in broadband feedback low-noise amplifiers are disclosed and may include controlling gain, power and/or a noise figure by selectively enabling one or more of a plurality of gain stages by activating one or more of a plurality of pairs of switching... Agent: Mcandrews Held & Malloy, Ltd

20080231358 - Power amplifier circuit: In a third operation in an amplifier, in which first and second amplifier circuits amplify a input signal, a distribution circuit adjusts the power of the signal supplied to the first amplifier circuit to within a range in which the input power to the first amplifier circuit and the output... Agent: Leydig Voit & Mayer, Ltd

20080231359 - Power divider/combiner and power dividing/combining method using the same: A power divider/combiner include a power n-dividing unit for dividing a power of an input signal to n divided signals (n: positive integer not less than 2); n phase adjustment units for adjusting a phase of each of said n divided signals; n amplifiers for amplifying each of said n... Agent: Nec Corporation Of America

20080231360 - Arrangement of signal line pairs and amplifiers: An arrangement of signal line pairs and amplifiers is disclosed. One embodiment provides each signal line pair of a group of signal line pairs that are directly adjacent and run parallel to one another is respectively assigned an amplifier from a group of amplifiers arranged successively in a signal line... Agent: Dicke, Billig & Czaja

20080231361 - Molecular transistor circuits compatible with carbon nanotube sensors and transducers: Small-signal and other circuit design techniques realized by carbon nanotube field-effect transistors (CNFETs) to create analog electronics for analog signal handling, analog signal processing, and conversions between analog signals and digital signals. As the CNFETs exist and operate at nanoscale, they can be readily collocated or integrated into carbon nanotube... Agent: Fitch Even Tabin And Flannery

20080231362 - Linear transconductor for rf communications: The present patent application comprises a linear transconductor having at least one input and at least one output, comprising a differential amplifier having a plurality of transistors and a plurality of inputs, wherein a difference of input signals is amplified, a cascode circuit having a plurality of transistors, wherein the... Agent: Qualcomm Incorporated

20080231363 - Temperature compensation of small signal gain of an amplifier stage: The invention relates to an differential amplifier circuit comprising an amplifier stage comprising a first and a second transistor, the gates of which are connected to differential input terminals of the amplifier stage. The differential amplifier further comprises a temperature compensation circuit comprising a third and fourth transistor. The third... Agent: Maginot, Moore & Beck Chase Tower

20080231364 - Amplifying circuit having a pull-up circuit and a pull-down circuit for increasing slew rate: An amplifying circuit includes an operational amplifier, a pull-up circuit and a pull-down circuit. The operational amplifier generates a first pull-up signal, a first pull-down signal and an output signal, wherein the phases of the first pull-up signal and the first pull-down signal are out of phase with the output... Agent: North America Intellectual Property Corporation

20080231365 - Operational amplifier: An operational amplifier including an input amplifier configured to amplify at least one differential input signal, a first common mode feedback amplifier configured to amplify a first common mode voltage, a cascode amplifier configured to cascode-amplify output signals from the input amplifier and the first common mode feedback amplifier, a... Agent: Birch Stewart Kolasch & Birch

20080231366 - Method and system for a low noise amplifier with tolerance to large inputs: Methods and systems for a low noise amplifier with tolerance to large inputs are disclosed. Aspects of one method may include providing an individual current source for each input transistor to a low noise amplifier (LNA), wherein the individual current sources may be isolated from each other when the LNA... Agent: Mcandrews Held & Malloy, Ltd

20080231367 - Amplifier: An amplifier according to the present invention includes an amplifying transistor, and an impedance converter circuit coupled to an output unit of the amplifying transistor and including a plurality of impedance converting transistors different in input impedance, which are series-connected.... Agent: Arent Fox LLP

20080231368 - Wireless frequency power amplifier, semiconductor device, and wireless frequency power amplification method: A differential amplifier circuit is connected to the input node and the output node of the final amplification stage through detection circuits. The signal level difference output from the differential amplifier circuit does not change even if the input power varies. Because a change in the power gain at the... Agent: Ratnerprestia

20080231370 - Apparatus and methods for amplifiers: Circuits and methods for reducing distortion in an amplified signal are disclosed. The circuits and methods may use multiple single-ended gain stages to produce multiple amplified signals. The amplified signals may be processed in combination to produce a resulting output signal having little, or no, distortion. The circuits may be... Agent: Wolf Greenfield & Sacks, P.C.

20080231369 - Variable-gain low-noise amplifier: A variable-gain low-noise amplifier is provided. The variable-gain low-noise amplifier includes a first load, a second load, an input transistor, a pole/zero control circuit, and a gain control circuit. A first terminal of the first load is connected to a power-source voltage, and a second terminal thereof is connected to... Agent: Cantor Colburn, LLP

20080231371 - Amplifier circuit with adjustable amplification: An amplifier circuit has an amplifier element having an amplifier element input and an amplifier element input impedance, an amplification adjuster adapted to adjust an amplification of the amplifier element, an amplifier circuit input coupled to the amplifier element input, an impedance element having a alterable impedance value and being... Agent: Schoppe, Zimmerman , Stockeller & Zinkler C/o Keating & Bennett , LLP

20080231372 - Dynamic biasing amplifier apparatus, dynamic biasing apparatus and method: A dynamic biasing amplifier apparatus, and dynamic biasing apparatus, and method are disclosed. The dynamic biasing amplifier apparatus includes a comparator unit, a dynamic bias generator unit, and an amplifier unit. The amplifier unit receives an input signal and output an output signal based on at least a bias voltage.... Agent: Jianq Chyun Intellectual Property Office

20080231373 - Output circuit: One embodiment of the invention provides an output circuit for a transistor. The output circuit includes a first capacitor coupled between ground and a drain electrode of the transistor via a first bond wire and a second bond wire coupling which couples a node between said first bond wire coupling... Agent: Coats & Bennett/infineon Technologies

20080231374 - Power efficient multistage amplifier and design method: A multistage amplifier and design method are disclosed. The multistage amplifier has a plurality of amplifier stages, each stage having an amplifier designed and biased to operate at or near the amplifier's power added efficiency (PAE) peak. The PAE peak of each of the amplifier is at or near the... Agent: Snell & Wilmer L.L.P. (main)

20080224767 - Semiconductor integrated circuit and method for adjusting a capacitance value of a phase compensating capacitor: A semiconductor integrated circuit has an amplifier circuit which includes a phase compensating capacitor and has a feedback loop, and a stability determining and adjusting circuit which measures an amplitude of a voltage outputted from the amplifier circuit at a predetermined plurality of frequencies and adjusts a capacitance value of... Agent: Amin, Turocy & Calvin, LLP

20080224768 - Operational amplifier capable of compensating offset voltage: An operational amplifier capable of compensating offset voltage includes an input stage circuit having a positive input end, a negative input end, a first current output end, and a second current output end, for outputting current corresponding to voltage received by the positive and negative input ends, an output stage... Agent: North America Intellectual Property Corporation

20080224769 - Power supply providing ultrafast modulation of output voltage: A circuit for use with a power amplifier that amplifies an input signal. The circuit may comprise an amplitude correction circuit and an open-loop switching regulator. The amplitude correction circuit may be configured to generate a corrected envelope signal from an input envelope signal that represents an envelope of the... Agent: K&l Gates LLP

20080224770 - Active circuits with isolation switches: Active circuits with isolation switches are described. In one design, an apparatus includes first and second amplifiers coupled in parallel. Each amplifier receives an input signal and provides an output signal. Each amplifier has a switch that isolates the amplifier when the amplifier is turned off. The first and second... Agent: Qualcomm Incorporated

20080224771 - Compensation for parasitic coupling between rf or microwave transistors in the same package: Parasitic coupling effects between RF or microwave transistors provided in a common package are compensated by connecting one or more capacitors between the transistors. By connecting the capacitor(s) at a location that corresponds to the site of the coupling, the compensation is effective over a wide frequency band. This coupling-compensation... Agent: Freescale Semiconductor, Inc. Law Department

20080224772 - Operational amplifier selecting one of inputs, and an amplifying apparatus using the op amplifier the verification method: A current feedback-type operational amplifier comprising multiple input parts and one output part, wherein each of the multiple input parts comprises a first input terminal, a second input terminal, and an output terminal, the signals input from the first input terminal are buffer amplified and output to the second input... Agent: Ohlandt, Greeley, Ruggiero & Perle, LLP

20080224773 - Digital input class-d amplifier: A digital input class-D amplifier includes a decoder which outputs a plurality of lines of time-series digital signals having a density of 1 or 0 conforming to an input digital signal, an error integrator which integrates a difference between a drive waveform to be applied to a load and a... Agent: Pillsbury Winthrop Shaw Pittman LLP

20080224774 - Method and apparatus for systematic and random variation and mismatch compensation for multilevel flash memory operation: Method and means for random or systematic mismatch compensation for a memory sensing system are disclosed. A sense amplifier includes a bulk voltage source to set the bulk of the sensing transistor to be a voltage different than the voltage driving the sensing transistor. For an NMOS sensing transistor, a... Agent: Dla Piper US LLP

20080224775 - Variable gain amplifier: A variable gain amplifier includes multiple gain stages. Each gain stage includes a gain transistor and a cascode transistor to form a cascode amplifier, and a current diversion transistor to divert current away from a cascode transistor to reduce gain in the stage. A control circuit is included to maintain... Agent: Lemoine Patent Services, PLLC

20080224776 - Common-mode voltage controller: A common-mode voltage controller for adjusting common-mode voltages between a first buffer and a second buffer at a subsequent stage or a preceding stage of the first buffer in a signal transmission circuit, comprising: a first reference voltage generation unit for generating a common-mode voltage corresponding to the first buffer;... Agent: Arent Fox LLP

20080224777 - Rail-to-rail amplifier circuit and semiconductor device: A rail-to-rail amplifier for amplifying an analog signal from a DAC includes a first differential input section, which includes an n-channel transistor pair, a second differential input section, which includes a p-channel transistor pair, a first current supply provided between the second differential input section and a high voltage side... Agent: Cantor Colburn, LLP

20080224778 - Transmission line amplifier: A transmission line amplifier utilizes a transmission line transistor having a gate line, and first and second lines. The gate line is a gate of the transistor, one of the first and second lines is a source of the transistor, and the other is a drain of the transistor. The... Agent: Kathy Manke Avago Technologies Limited

20080224779 - Programmable gain amplifier with noise cancellation: A wide-band adjustable gain low-noise amplifier (LNA) is disclosed. In various embodiments, the LNA includes a first inverting amplifier configured to generate a first intermediate signal. A first attenuator is configured to receive the first intermediate signal and to generate a second intermediate signal. In various embodiments, the LNA includes... Agent: Schwegman, Lundberg & Woessner, P.A.

20080224780 - Transconductance control circuit, method of controlling transconductance, and a power amplifier: A transconductance control circuit, comprising: a test transconductance circuit for providing an output current from a reference voltage; apparatus for deriving a bias current for the test transconductance circuit from the output current, the bias current including a component that varies with temperature and a component that varies with process;... Agent: Wilmerhale/boston

20080224781 - Variable gain amplifiers: t

20080218258 - Digital isolator: A signal isolator comprises an isolation barrier, a transmitter, a differentiator, and a recovery circuit. The transmitter is coupled to a first side of the isolation barrier and is configured to receive and convert an information signal to a differential signal that encodes information in the information signal in a... Agent: Koestner Bertani LLP

20080218259 - Method and apparatus for distortion of audio signals and emulation of vacuum tube amplifiers: A method for digitally processing audio signals to emulate the effects of vacuum tube amplifiers and preamplifiers, musical instrument amplification systems, and distortion effects. By use of a parametrically-controlled non-linear transfer function, non-linear filters, feedback elements, and power-law function models, the dynamic behavior and distortion effects of tube amplification stages... Agent: Marc Gallo

20080218260 - Multiple rf path amplifiers: An amplifier is disclosed for providing processing of a variable RF signal, the amplifier comprising a first parallel gain stage and a plurality of second parallel gain stages electrically disposed between an input fixed impedance matching circuit and an output fixed impedance matching circuit. Wherein in operation each of the... Agent: Kenyon & Kenyon LLP

20080218261 - Rf power amplifier mirror circuit for sensing current: An apparatus and method is disclosed for providing a mirror circuit for detecting a change in current of a RF power amplifier. The mirror circuit includes a voltage operably coupled with the mirror circuit, a bias circuit operably coupled with the mirror circuit, wherein the bias circuit is capable of... Agent: Booth Udall, Plc

20080218262 - Predistortion with asymmetric usage of available bandwidth: The invention relates to a method for performing predistortion of a radio frequency signal, said radio frequency signal comprising a wanted signal and a first and a second intermodulation distortion signal sideband, comprising: defining a predistortion window, positioning said predistortion window asymmetrically around said radio frequency signal, predistorting said radio... Agent: Sughrue Mion, Pllc

20080218263 - Wideband differential amplifier including single-ended amplifiers coupled to a four-port transformer: A differential amplifier is formed from a first single-ended amplifier circuit, a second single-ended amplifier circuit, and a four-port transformer circuit coupled to the first and second single-ended amplifier circuits to form the differential amplifier.... Agent: Paul F. Rusyn Graybeal Jackson Haley LLP

20080218264 - Class d amplifier arrangement: An amplifier arrangement for operation at supply voltages of at least 100V and at output powers of at least 1 kW includes a half-bridge formed from two switching elements connected in series, two supply voltage terminals, and an output connection between the switching elements. A bypass capacitor is in parallel... Agent: Fish & Richardson Pc

20080218265 - Amplifier structures that enhance transient currents and signal swing: Amplifier embodiments are provided that are well suited for systems which require high signal gains and high transient currents that can drive various loads (e.g., capacitive loads). These embodiments are also well suited for electronic systems in which the available amplifier headroom is significantly limited. Exemplary systems are multiplying digital-to-analog... Agent: Koppel, Patrick & Heybl

20080218266 - Amplifier circuit with input terminals thereof connected to sampling capacitors: Sampling capacitors are connected respectively to a pair of differential input terminals of an operational amplifier. The sampling capacitors sample input signals. Source terminals and drain terminals of dummy switches are connected respectively to paths connecting the operational amplifier and the sampling capacitors, so that a common-mode voltage of differential... Agent: Mcdermott Will & Emery LLP

20080218267 - Amplifier with level shifting feedback network: An amplifier circuit includes a low noise first stage and a wide dynamic range second stage. A feedback network coupled between the output of the second stage and the input of the first stage provides DC level shifting of the common mode input voltage. The common mode input voltage is... Agent: Lemoine Patent Services, Pllc C/o Intellevate

20080218268 - Automatic gain control circuit: An automatic gain control circuit for controlling the gain of a variable gain amplifier block includes a count control signal generating block, an up-down counter, a gain control signal generating block, and a downcount clock signal generating block. The up-down counter upcounts an upcount clock signal or downcounts a downcount... Agent: Mcdermott Will & Emery LLP

20080218269 - Power amplifier circuit, control method thereof and control program thereof: A power amplifier circuit includes a first variable gain amplifier for amplifying an input signal, a second variable gain amplifier for amplifying an output signal of the first amplifier, and a control circuit for controlling the gain of the first variable gain amplifier based on the output signal of the... Agent: Nec Corporation Of America

20080218270 - Multi-mode power amplifier with low gain variation over temperature: A multi-mode RF amplifier is described having at least a higher and a lower power path coupling an input to an output. At a pre-selected output power level, the higher power path is enabled while the lower power path is disabled when more output power is required. The process is... Agent: Cesari And Mckenna, LLP

20080218271 - Rf power amplifier protection: A circuit and method for protecting a radio frequency power amplifier against peak drain voltage. A detector circuit has an input connected to a drain of a power transistor of an amplification stage of the power amplifier to detect a peak drain voltage therefrom. The detector circuit outputs a protection... Agent: Motorola, Inc.

20080218272 - Wideband digital single-to-differential converter and method of forming same: A method and apparatus for single-to-differential conversion includes a single-to-differential stage (22), a phase balancing stage (24), and a buffer stage (26). The single-to-differential stage (22) converts a single input signal (Vclk) to a first and second output signal (Vn,Vp), where the first and second output signals (Vn,Vp) correspond to... Agent: Motorola, Inc

20080218273 - Tunable rf bandpass transconductance amplifier: Aspects of the disclosure can provide a bandpass transconductance amplifier that can include a minuend transconductance amplifier that converts a voltage signal to a first current and a subtrahend transconductance amplifier that converts the voltage signal to a second current having substantially the same amplitude as the first current but... Agent: Oliff & Berridge, Plc

20080211574 - Chopper-stabilized instrumentation amplifier: This disclosure describes a chopper stabilized instrumentation amplifier. The amplifier is configured to achieve stable measurements at low frequency with very low power consumption. The instrumentation amplifier uses a differential architecture and a mixer amplifier to substantially eliminate noise and offset from an output signal produced by the amplifier. Dynamic... Agent: Shumaker & Sieffert , P.a

20080211575 - Loop gain equalizer for rf power amplifier: The output power of an RF power amplifier is controlled using a feedback loop including a differential integrator for controlling the amplifier's bias voltage. The gain of integration in the differential integrator is varied so as to compensate for variations in the derivative of the power amplifier output power versus... Agent: Freescale Semiconductor, Inc. Law Department

20080211576 - Linearization of rf power amplifiers using an adaptive subband predistorter: Predistorting an input signal prior to amplification in an RF power amplifier (206) includes isolating a plurality sub-band signals, each representing a portion of the input signal s(t). The method includes independently modifying an amplitude and a phase of each of the plurality of sub-band signals. The modification of the... Agent: Harris Corporation C/o Darby & Darby PC

20080211577 - Audio power amplifier using virtual ground and method of processing signal in the audio power amplifier: An audio power amplifier provides a virtual ground to reduce power on/off noise and a method for processing a signal in the audio power amplifier. The audio power amplifier includes a switching amplifier to amplify a small output pulse width modulation (PWM) signal so as to generate a large output... Agent: Stanzione & Kim, LLP

20080211578 - Delta sigma-type ad converter, class-d amplifier, and dc-dc converter: A ΔΣ-type AD converter includes a subtractor which receives an analogue input signal and a feedback signal and which outputs a signal pertaining to a difference between the signals, an integrator which integrates a signal output from the subtractor, a comparator which binarizes a signal output from the integrator by... Agent: Pillsbury Winthrop Shaw Pittman LLP

20080211579 - Method and apparatus for optimizing power dissipation in a low noise amplifier: A method and a low noise amplifier are provided such that the low noise amplifier has a power dissipation that is adaptive to the noise interference levels. The low noise amplifer includes (i) first, second and third differential amplifiers connected in series each having a terminal for receiving a power... Agent: Thomas, Kayden, Horstemeyer & Risley, LLP

20080211581 - Amplifier circuit with internal zeros: An amplifier circuit with internal zeros provides a second pole in addition to a first pole and two zeros such that the second pole can prevent excessive gain at high frequency, so as to have high-frequency noise under control.... Agent: Rosenberg, Klein & Lee

20080211580 - Low noise ac differential amplifier with reduced low corner frequency and current consumption: An integrated amplifier may include a transconductance stage including a differential pair of input transistors of a first type of conductivity, respective resistive loads coupled to said input transistors, and a first bias circuit coupled to the input transistors. The first bias circuit may include a second differential pair of... Agent: Allen, Dyer, Doppelt, Milbrath & Gilchrist P.A.

20080211582 - Wide-band adjustable gain low-noise amplifier: A wide-band adjustable gain low-noise amplifier (LNA) is disclosed. In various embodiments, the LNA includes a first sub-circuit and a second sub-circuit coupled in parallel. In various embodiments, the first sub-circuit includes an amplifier configured to receive power when a logical signal is asserted and de-powered otherwise. In various embodiments,... Agent: Schwegman, Lundberg & Woessner, P.A.

20080211584 - Cross-differential amplifier: A cross-differential amplifier is provided. The cross-differential amplifier includes an inductor connected to a direct current power source at a first terminal. A first and second switch, such as transistors, are connected to the inductor at a second terminal. A first and second amplifier are connected at their supply terminals... Agent: Mr. Christopher John Rourk Jackson Walker LLP

20080211583 - System and method for dynamic drain voltage adjustment to control linearity, output power, and efficiency in rf power amplifiers: A system and method for dynamic adjustment of drain or collector voltage of a power amplifier (PA), including a PA having a voltage input, a temperature sensor measuring ambient temperature of the PA, and an adaptive PA control processor that dynamically changes the input voltage based on the ambient temperature,... Agent: Roberts Mlotkowski Safran & Cole, P.C.

20080211585 - Adaptive protection circuit for a power amplifier: s

20080211586 - Dual input low noise amplifier for multi-band operation: A dual input low noise amplifier (LNA) for multi-band frequency operation is disclosed. The dual input LNA (100) simultaneously operates in two amplifier configurations for the two inputs (101 and 103), of a first frequency band and a second frequency band, to produce a common output (113). Matching networks (102... Agent: Motorola, Inc

20080211587 - Method and apparatus for increasing the efficiency of low power amplifier: The present invention is directed to a method for reducing the current consumption and increasing the efficiency of an RF power amplifier (PA), while maintaining the output power. The desired output power of the PA is determined and for each level of the desired output power, the load that is... Agent: Marsteller & Associates