Amplifiers inventions 11/08

20080290937 - Constant gain amplifier system with positive and negative feedback: Constant and accurate signal gain systems based on controlling oscillator loop gain. A constant gain positive feedback network and an amplifier form an oscillator. Only when the oscillator loop gain is at least one does the oscillator produces an AC signal. Negative feedback of the oscillator's AC signal level is... Agent: Fred Mirow

20080290938 - Multibit digital amplifier for radio-frequency transmission: A broadband multibit digital radio-frequency (RF) signal is synthesized digitally. to convert the digital signal to a high-power analog signal for RF transmission. Each bit (or cluster of bits) of the digital signal is first separately amplified using a fast switching amplifier with a controlled dc power supply voltage. The... Agent: Henry I. Schanzer, Esq

20080290939 - Method and apparatus for distortion correction of rf amplifiers: A method of reducing distortion in the output of an amplifier is provided. The method comprises subtractively combining baseband error signals with the appropriate phase shift with baseband input signals, the baseband error signals generated by subtractively combining delayed fed-forward portions of the baseband input signals with baseband converted portions... Agent: Townsend And Townsend And Crew, LLP

20080290942 - Differential amplifier: A cascode current mirror circuit is connected as an active load to the input differential pair. A tail current source supplies a tail current to the input differential pair. A constant current source is connected in parallel with the input differential pair, and supplies a constant current to the tail... Agent: Martine Penilla & Gencarella, LLP

20080290940 - Differential low noise amplifier (lna) with common mode feedback and gain control: A method, algorithm, architecture, circuits, and/or systems for low noise amplification are disclosed. In one embodiment, an amplifier can include an input stage, including a first differential input configured to receive a differential signal, a first current source coupled to the first differential input, a first current load receiving a... Agent: Epson Research And Development Inc Intellectual Property Dept

20080290941 - Nanoelectronic differential amplifiers and related circuits having carbon nanotubes, graphene nanoribbons, or other related materials: 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

20080290943 - Multi-mode amplifier arrangement and method for controlling an amplifier arrangement: A multi-mode amplifier arrangement comprises an amplifier having a plurality of field effect transistors selectable in response to a control signal at a control terminal, said plurality of field effect transistors coupled to an input terminal to receive a signal to be amplified, said amplifier arranged between a supply terminal... Agent: Eschweiler & Associates LLC

20080290944 - Micropower neural amplifier with adaptive input-referred noise: A micropower neural amplifier with adaptive power biasing for use in multi-electrode arrays is provided. The micropower neural amplifier includes a low noise gain stage. The low noise gain stage is implemented using an amplifier and pseudoresistor elements.... Agent: Gauthier & Connors, LLP

20080290945 - Class ab output stage and method for providing wide supply voltage range: A class AB output stage includes first (MP) and a second (MN) output transistors having sources coupled to first (VDD) and second reference voltages, respectively, drains coupled to an output (13), and gates coupled to first (11A) and second (12A) conductors, respectively. Portions of first (IIN1) and a second (IIN2)... Agent: Texas Instruments Incorporated

20080290946 - Semiconductor integrated circuit device: A semiconductor integrated circuit 2A, a leak current detection circuit 3, a comparison operation circuit 4 and an applied voltage output circuit 5A are provided. The semiconductor integrated circuit 2A has a circuit body 21 including a plurality of functional MOSFETs for performing predetermined functional operations, and a monitor circuit... Agent: Mcdermott Will & Emery LLP

20080290947 - Reconfigurable tunable rf power amplifier: A multi-band, multi-standard programmable power amplifier having tunable impedance matching input and output networks and programmable device characteristics. The impedance of either or both of the impedance matching input and output networks is tunable responsive to one or more control signals. In one example, the programmable power amplifier incorporates a... Agent: Lowrie, Lando & Anastasi, LLP

20080290948 - Impedance transformer for amplifier and amplifier including the same: An amplifier has an input port, an output port, N gain elements in parallel, an input power splitter coupled between the input port of the amplifier and the input ports of the N gain elements, an output resistor chain extending between the output ports of the first through Nth gain... Agent: Kathy Manke Avago Technologies Limited

20080290949 - Apparatus and method for asymmetric charge pump for an audio amplifier: An audio amplifier with an integrated asymmetric charge pump is provided. The audio amplifier receives VDD and VSS as power supply signals. The integrated charge pump is arranged to provide VSS from VDD, such that VSS is a negative voltage that is lower in magnitude than VDD.... Agent: National Semiconductor Corporation C/o Darby & Darby P.C.

20080290950 - Semiconductor integrated circuit: The semiconductor integrated circuit includes a constant voltage regulator 3 generating a predetermined constant voltage from an external power supply 16, an inverting charge pump circuit 2 using the output of the constant voltage regulator as its power supply, and an amplifier circuit 4 using the negative voltage outputted by... Agent: Hamre, Schumann, Mueller & Larson P.C.

20080290951 - Semiconductor device: A current limiting circuit is connected to the gate (input terminal) of an amplifying transistor. The current limiting circuit includes a protecting transistor, a first protecting resistor connecting the drain to the gate of the protecting transistor, and a second protecting resistor connecting the source to the gate of the... Agent: Leydig Voit & Mayer, Ltd

20080290952 - Dvd reading apparatus: A photodiode (201) is positioned so as to detect a beam of light reflected from the surface of a spinning DVD. In response to the detection of incident light, the photodiode (201) generates a signal, which is input to a trans-impedance amplifier (203). The output of the trans-impedance amplifier (203)... Agent: Townsend And Townsend And Crew, LLP

20080284507 - Autozeroing current feedback instrumentation amplifier: An embodiment is directed to an instrumentation amplifier. The instrumentation amplifier includes an output stage for generating an output voltage, a low-frequency path coupled with the output stage, and a high-frequency path coupled with the output stage. The high-frequency path dominates the low-frequency path at frequencies above a particular frequency,... Agent: Nsc C/o Murabito Hao & Barnes, LLP

20080284508 - Output circuits with class d amplifier: Output circuits using pulse width modulation (PWM) and/or pulse density modulation (PDM) are described. In one aspect, a PWM output circuit includes a PWM modulator that operates based on a square wave signal instead of a sawtooth or triangular wave signal. In another aspect, a PDM output circuit includes a... Agent: Qualcomm Incorporated

20080284509 - N-way doherty distributed power amplifier: A power amplifier using N-way Doherty structure for extending the efficiency region over the high peak-to-average power ratio of the multiplexing modulated signals such as wideband code division multiple access and orthogonal frequency division multiplexing is disclosed. In an embodiment, the present invention uses a dual-feed distributed structure to an... Agent: Law Offices Of James E. Eakin

20080284510 - Error driven rf power amplifier control with increased efficiency: A power amplifier controller for adjusting a supply voltage to a power amplifier. The power amplifier controller adjusts the supply voltage so that distortion in an RF output signal corresponds to a predetermined limit. An amplitude error signal is generated by the power amplifier controller which represents a difference between... Agent: Fenwick & West LLP

20080284511 - Device comprising a switching amplifier and a load: Devices (1) comprising switching amplifiers (2,3) such as class D amplifiers and comprising loads (4) such as loud speakers are provided with controllers (2) for controlling switching circuits (3) for in respective four states introducing respective four voltage signals across the loads (4), which four voltage signals are different from... Agent: Nxp, B.v. Nxp Intellectual Property Department

20080284512 - Power amplifier circuitry and method: A method and apparatus is provided for use in power amplifiers for reducing the peak voltage that transistors are subjected to. A power amplifier is provided with first and second switching devices and an inductor connected between the switching devices. The switching devices are driven such that the switching devices... Agent: Johnson & Associates

20080284513 - Fully differential amplifier: A fully differential amplifier includes: an N-stage amplifier including first to Nth amplifier stages, where N is a positive integer greater than or equal to 2, the first to Nth amplifier stages being cascaded in sequence so as to generate a pair of differential output voltages; a common mode feedback... Agent: Mcnees Wallace & Nurick LLC

20080284514 - Differential amplifier with multiple signal gains and wide dynamic range: A circuit and method for amplifying a differential input signal over a wide dynamic range using multiple signal gains such that, over a predetermined range of values of the differential input signal, a ratio of the differential output signal to the differential input signal varies in relation to a continuous... Agent: National Semiconductor Corporation C/o Vedder Price Kaufman & Kammholz

20080284515 - Circuits for quiescent current control: A circuit capable of quiescent current control, the circuit comprising a first operational transconductance amplifier (OTA) including a first output terminal, a first transistor including a first gate coupled to the first output terminal of the first OTA, a second OTA including a second output terminal, a second transistor including... Agent: Akin Gump LLP - Silicon Valley

20080284516 - Monolithic lna support ic: A low noise amplifier (LNA) comprises: a plurality of FETs (F1, F2, F3, F4) arranged to process signals received by the amplifier; a power input (10) arranged to receive electrical power to operate the LNA; and a monolithic support integrated circuit (IC). The monolithic support IC comprises: a FET control... Agent: Reising, Ethington, Barnes, Kisselle, P.C.

20080284517 - Variable gain amplifier: A method of varying the gain of an amplifier and an amplifier array are provided. The amplifier array includes two or more amplifier stages (201, 202) connected in parallel with each amplifier stage having a gain control means. Input signal means (203, 204) are provided for each amplifier stage with... Agent: Lieberman & Brandsdorfer, LLC

20080284518 - Overdrive control system: An overdrive control system includes a voltage controlled current source to deliver a compensation current, and being between a first voltage reference and an internal node, which is connected to an output terminal. The voltage controlled current source has a control terminal connected to an output terminal of an adding... Agent: Allen, Dyer, Doppelt, Milbrath & Gilchrist P.A.

20080284519 - Apparatus and method for power added efficiency optimization of high amplification applications: A power added efficiency optimizer apparatus is provided for measuring and monitoring input and output power of an amplifying device, and adjusting the load impedance seen by the amplifying device so that power added efficiency is maintained at optimum levels. A power added efficiency optimizing device includes a variable load... Agent: Antonelli, Terry, Stout & Kraus, LLP

20080284520 - System and method for power detection in a power amplifier: A system for detecting power output of a power amplifier includes a first power detector configured to detect a forward power output of a power amplifier, the first power detector configured to provide a first power detector output, and a second power detector configured to receive a collector parameter signal... Agent: Michael J. Tempel Smith Frohwein Tempel

20080284521 - Electronic signal processor: An electronic signal processor for processing signals includes a complex first filter, one or more gain stages and a second filter. The first filter is characterized by a frequency response curve that includes multiple corner frequencies, with some corner frequencies being user selectable. The first filter also has at least... Agent: Mcandrews Held & Malloy, Ltd

20080284522 - Linear transimpedance amplifier with multiplexed gain stage: A linear transimpedance amplifier includes a forward transimpedance circuit that receives an input signal from an optical device. The forward transimpedance circuit generates a linear output signal. The forward transimpedance circuit includes a first gain path and a second gain path, the first gain path configured to amplify the input... Agent: Workman Nydegger

20080278230 - Systems and methods for correcting errors resulting from component mismatch in a feedback path: Systems and methods for minimizing performance degradation due to component mismatch in the feedback path of a digital PWM amplifier feedback loop. One embodiment comprises a digital pulse width modulated (PWM) amplifier with feedback. The amplification subsystem receives a digital audio signal and produces an analog output signal. The feedback... Agent: Law Offices Of Mark L. Berrier

20080278231 - Amplifier: An object of the present invention is, in a high-frequency amplifier using a semiconductor device as an amplifying device, to achieve a high efficiency by controlling input/output matching circuits so that they are always optimized, when a bias voltage applied to the semiconductor device is controlled to correspond to an... Agent: Nec Corporation Of America

20080278232 - Operational amplifier with rail-to-rail common-mode input and output range: An operational amplifier with a rail-to-rail common-mode input and output range comprises a differential input stage consisting of a first differential pair and a second differential pair for receiving an input signal; a summing circuit coupled to the differential input stage for outputting a summation result of the output signals... Agent: North America Intellectual Property Corporation

20080278233 - Buffer drive: The present invention relates to a CMOS buffer circuit for liquid crystal display (LCD) drivers, which includes a single stage operational transconductance amplifier (OTA) with a differential of transistors for receiving a differential input voltage, a bias current source coupled to the differential pair and a single-ended output, the first... Agent: Texas Instruments Incorporated

20080278234 - Output stage: An output stage, comprising a first transistor operable to pull a voltage at an output node towards a first voltage, and a rechargeable energy store having a potential difference between first and second terminals wherein the rechargeable energy store is arranged to be controllably connected between the output node and... Agent: Wolf Greenfield & Sacks, P.C.

20080278235 - Method and apparatus for protecting devices in an rf power amplifier: A method and apparatus are provided for use with a power amplifier for protecting active devices on the power amplifier. A peak detector is used by control circuitry to detect the presence of a peak voltage that exceeds a threshold voltage. In response to the detection of a peak voltage,... Agent: Johnson & Associates

20080278236 - Rf power amplifiers: a control ASIC for receiving an input power signal of the RF amplifier for providing a voltage control signal to the EPC to determine the value of the DC voltage, the control ASIC addressing an EEPROM holding a collection of control words that define output values of a control output... Agent: Buchanan, Ingersoll & Rooney PC

20080278237 - Techniques to reduce the power consumption of an rf log-amp detector: An embodiment of the present invention provides an RF log-amp detector, comprising a pre-amplifer at the input of the RF log-amp detector, a plurality of limiters with variable gain connected to the pre-amplifier, wherein the gain of the preamplifier is set to its minimum and the dynamic range is expanded... Agent: Law Office Of William J. Tucker

20080278238 - Variable gain circuit: Disclosed is a variable gain circuit including a gain change region in which the gain is changed substantially exponentially as a function of a control voltage. The gain is changed in the gain change region substantially exponentially based on a function {(1+x)2+K}/{1−x}2+K}, where x is a control voltage and K... Agent: Mcginn Intellectual Property Law Group, PLLC

20080278239 - Power amplifier with controlled output power: The invention includes a power amplifier with an amplifier core including parallel amplifier cells, a replica cell made of one amplifier cell similar to those of the amplifier core, a power controller to select a combination of amplifier cells to activate, a regulator to fix the top voltage of the... Agent: Griffin & Szipl, PC

20080278240 - Receiver circuitry: Receiving circuitry having a plurality of amplifiers coupled in series, a first of the amplifiers receiving an input signal and each of the amplifiers outputting an amplified signal; a plurality of comparators each coupled to the output of one of the amplifiers and having an input for receiving the amplified... Agent: Stmicroelectronics Inc. C/o Wolf, Greenfield & Sacks, P.C.

20080278241 - Device comprising an element with electrodes coupled to connections: An adaptive cruise control system and a method for controlling the speed of a vehicle are disclosed. The system generally includes a controller which determines a torque instruction associated with a limit speed of the vehicle which is less than a selected speed. The method generally includes determining a distance... Agent: Nxp, B.v. Nxp Intellectual Property Department

20080278242 - Amplifier: An amplifier has a self-bias circuit to generate the bias voltage for the input of the amplifying circuit in the amplifier, thereby simplifying the circuit complexity to reduce the size and cost of the amplifier.... Agent: Rosenberg, Klein & Lee

20080272840 - Multiple-input and multiple-output amplifier: The invention relates to an amplifier capable of producing a plurality of currents at its output terminals, these currents being controlled by a plurality of input voltages. A multiple-input and multiple-output amplifier of the invention includes 4 signal input terminals, 4 signal output terminals, 4 active sub-circuits and a feedback... Agent: Barnes & Thornburg LLP

20080272841 - Systems and methods of rf power transmission, modulation, and amplification, including embodiments for extending rf transmission bandwidth: Methods and systems for vector combining power amplification are disclosed herein. In one embodiment, a plurality of signals are individually amplified, then summed to form a desired time-varying complex envelope signal. Phase and/or frequency characteristics of one or more of the signals are controlled to provide the desired phase, frequency,... Agent: Sterne, Kessler, Goldstein & Fox P.l.l.c.

20080272842 - Calibrated feedback: A differential feedback amplifier is provided with a feedback network wherein that feedback network is adjustable so as to improve the PSRR of the amplifier. In another aspect of the present invention, a differential feedback amplifier is provided with a feedback network wherein that feedback network is adjustable so as... Agent: Raymond J. Werner

20080272844 - Class ab folded-cascode amplifier having cascode compensation: A class AB folded-cascode amplifier having improved gain-bandwidth product, comprises a differential input circuit including a differential transistor pair coupled to a source of tail current and responsive to a differential input signal for conducting a first current, a cascode circuit coupled to the differential input circuit for supplying a... Agent: Mcdermott Will & Emery LLP

20080272843 - Integrated amplifier circuit: An integrated amplifier circuit is provided with an amplifier that is composed of at least two amplifier regions, the amplifier regions being arranged about a symmetry point, wherein each amplifier region has a plurality of transistors in a transistor region, and wherein transistors from different amplifier areas are arranged within... Agent: Muncy, Geissler, Olds & Lowe, PLLC

20080272845 - 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

20080272846 - Adaptive biasing input stage and amplifiers including the same: An adaptive biasing input stage includes pairs of differentially coupled amplifying and sensing field effect transistors having gates with differential inputs applied thereon. In addition, a static current source is coupled to sources of the amplifying and sensing field effect transistors at a predetermined node. Also, current mirrors are coupled... Agent: Law Office Of Monica H Choi

20080272847 - Signaling system with low-power automatic gain control: An integrated circuit device includes a variable-gain amplifier, memory circuit and gain control update circuit. The variable-gain amplifier generates an amplified signal having an amplitude according to a gain control value that is stored, at least during a first interval, within the memory circuit. The update circuit generates an updated... Agent: Shemwell Mahamedi LLP

20080272848 - Nested transimpedance amplifier: A nested transimpedance amplifier (TIA) circuit comprises a zero-order TIA having an input and an output. A first operational amplifier (opamp) has an output and an input that communicates with said output of said zero-order TIA. A first power supply input applies a first voltage to the zero-order TIA. A... Agent: Harness, Dickey & Pierce P.L.C

20080272849 - Active baluns: Example embodiments of the invention may provide for active baluns. An example active balun may include a resonator that may convert a single-ended input signal to at least two differential input signals, and a differential switching block that includes first and second transistors that each receive a respective one of... Agent: Sutherland Asbill & Brennan LLP