Amplifiers inventions 02/09

20090051423 - Digital audio amplifiers, electronic systems, and methods: An embodiment of an electronic system includes a digital audio amplifier having a continuous time modulator adapted to generate a difference signal between an audio bitstream and a feedback signal, and to perform a modulation process on the difference signal to generate an input pulse modulated signal, a class D... Agent: Ingrassia Fisher & Lorenz, P.C. (fs)

20090051424 - Active circuits with load linearization: Active circuits with active loads linearized via distortion cancellation are described. In one design, an apparatus includes a first stage and a load stage. For an amplifier, the first stage amplifies an input signal and provides an output signal having a larger signal level. For a mixer, the first stage... Agent: Qualcomm Incorporated

20090051426 - Large-dynamic-range lookup table for a transmitter predistorter and system and method employing the same: A predistorters for use with a nonlinear element and methods of predistorting for a nonlinear element for use in a 3G, e.g., WCDMA transmitter. In one embodiment, the predistorter includes: (1) a lookup table having non-uniformly spaced entries therein, (2) a compander configured to compand an input signal based on... Agent: Texas Instruments Incorporated

20090051425 - Predistortion system and method based on look up table interpolation: A system comprising a pre-power amplifier and a hardware device which is configured to predistort an amplitude input signal by comparing interpolated data places, determined by comparing the input signal with data from a LUT, coming from a LUT with the amplitude input signal and choosing the closest input data... Agent: Texas Instruments Incorporated

20090051427 - Output limiting circuit, class d power amplifier and audio equipment: An output limiting circuit includes a reference current generating portion for converting a predetermined constant voltage into a reference current by using a first resistor, an upper side clip voltage generating portion for converting the reference current into an upper side clip voltage with respect to a bias voltage of... Agent: Fish & Richardson P.C.

20090051428 - Agc circuit: This invention offers an AGC circuit that prevents disturbance in an output waveform when an input signal varies abruptly. A first terminal of a capacitor is connected with an output terminal of a variable gain amplifier and a second terminal of the capacitor is connected with a non-inverting input terminal... Agent: Morrison & Foerster LLP

20090051429 - High resolution variable gain control: A gain circuit includes an analog section with variable gain and a digital section with variable gain. The gain steps for the digital section have a higher resolution than the gain steps for the analog section. In some implementations, gain steps can be achieved much finer than 0.1 db or... Agent: Fish & Richardson P.C.

20090051430 - Variable gain circuit: where 0≦K≦1 and x is a variable corresponding to the control voltage. The denominator and the numerator of the above function are given by a first sum current and a second sum current, respectively. The first sum current is a sum of the drain current of a first transistor and... Agent: Mcginn Intellectual Property Law Group, PLLC

20090051432 - High-bandwidth high-gain amplifier: A pipelined analog to digital converter includes a first stage that receives an input voltage, that generates a first sampled digital value and a first residue voltage, and that includes a first amplifier that amplifies the first residue voltage and generates a first amplified residue voltage. A second stage receives... Agent: Harness, Dickey & Pierce P.L.C

20090051431 - High-swing operational amplifier output stage using adaptive biasing: An output stage includes two transistors (switching transistor and biasing transistor) coupled in series in a pullup current path between a VDDA node and an output node, and also includes two transistors (switching transistor and biasing transistor) coupled in series in a pulldown current path between the output node and... Agent: Qualcomm Incorporated

20090051433 - Differential sensing with high common mode rejection: A differential operation circuit that uses the differential input signals to generate a reference voltage that fluctuates with the common mode voltage of the differential input signals. The reference voltage includes a common mode component that generally follows the common mode voltage of the differential input signals. The common mode... Agent: Workman Nydegger 1000 Eagle Gate Tower

20090051434 - Signal transfer circuit and circuit device using same: A signal transfer circuit appropriate for use in realizing both high circuit stability and high current driving ability is disclosed. Signal transfer circuit A has current transfer circuit 3 that transfers a signal current via first reference current I1. In one embodiment, current transfer circuit 3 has current transcription circuit... Agent: Texas Instruments Incorporated

20090051436 - Method and system for fet-based amplifier circuits: Amplifier circuits and methods are implemented using a variety of different embodiments. According to one such embodiment, a method is implemented using a field-effect transistor (FET) having a gate node, a source node and a drain node. A first circuit state is implemented in which the gate node, the source... Agent: Crawford Maunu PLLC

20090051435 - Rf amplifier with stacked transistors, transmitting device, and method therefor: An RF transmitting device (10) includes an RF amplifier (22) formed having components formed on a common semiconductor substrate (14). RF amplifier (22) includes MOS transistors (42) and (44) and an RF choke (46) stacked between a ground node (32) and a Vdd node (36). Transistors (42) and (44) are... Agent: Meschkow & Gresham, P.L.C

20090051437 - Power amplifier: An emitter follower circuit applies to an input terminal of a second amplifying device a voltage according to a reference voltage applied to a reference terminals. First and second resistors are connected in series between the reference terminal and an input terminal of a first amplifying device. The collector of... Agent: Leydig Voit & Mayer, Ltd

20090051438 - Amplifying system: The performance of an amplifying system is improved by achieving adequate matching. The amplifying system for amplifying signals includes distributing means 1 that distribute a signal, a carrier amplifier 2 that amplifies the distributed first signal in Class AB, a peak amplifier 4 that amplifies the distributed second signal in... Agent: Wenderoth, Lind & Ponack, L.L.P.

20090051439 - Transconductance signal capacity format: Operational transconductance amplifiers have a natural signal capacity format in which signal performance can be expressed in terms of fixed percentages. Input signal can be applied to Operational transconductance amplifiers in this natural signal capacity format in order to optimize performance. A signal which drives a given Operational transconductance amplifier... Agent: Don Roy Sauer

20090051440 - Active balun circuit: There is provided an active balun circuit including: a load circuit unit including a first and a second load; a differential amplifying unit including a first amplifying unit connected to the first load, and a second amplifying unit connected to the second load and forming a differential amplifying unit together... Agent: Lowe Hauptman Ham & Berner, LLP

20090051441 - Low-noise amplifier: Methods and corresponding systems in a low noise amplifier include selecting a selected sub-band for amplifying, wherein the selected sub-band is one of a plurality of sub-bands, wherein each sub-band is a portion of a frequency band, and wherein each sub-band has a corresponding sub-band center frequency. Next, a gate-source... Agent: Law Office Of Charles W. Bethards, LLP

20090051442 - Transimpedance amplifier circuit for optical receiver in optical communication system: A transimpedance amplifier circuit for an optical receiver in an optical communication system in which a range of an increase/decrease in bandwidth according to gain change is reduced by a bandwidth adjustor. The circuit includes: a photodiode (PD) for generating a current signal by photoelectric conversion of an input optical... Agent: Cha & Reiter, LLC

20090045872 - Integrated transceiver with envelope tracking: A transceiver comprises an amplifying circuit for amplifying an input signal to produce an output signal. A power supply is operable for varying the level of power supplied to the amplifying circuit in response to variation of an input signal envelope directed to the power supply. A processing circuit is... Agent: Wood, Herron & Evans, LLP (commscope/andrew)

20090045873 - Close-loop class-d audio amplifier and control method thereof: The present invention discloses a Class-D power amplifier and control method thereof. In one embodiment, the amplifier feeds back the signal at the output node to the inverting input of the comparator, and provides a high frequency triangular wave signal to the non-inverting input of the comparator. In addition, the... Agent: Zilka-kotab, PC

20090045875 - Data amplifying circuit controllable with swing level according to operation mode and output driver including the same: A data amplifying circuit for an output driver has a swing level that is controllable according to an operation mode. The data amplifying circuit includes a mode responding circuit supplying an additional source current to a source node of an amplifying circuit in response to a mode selection signal. The... Agent: Mills & Onello LLP

20090045874 - Differential amplifier and input circuit using the same: A differential amplifier comprises a plurality of first switching elements configured to output differentially amplified signals through output terminals when a voltage level of a first input signal and a second input signal belongs to a first range and a plurality of second switching elements configured to output the differentially... Agent: Baker & Mckenzie LLP Patent Department

20090045876 - Low noise, low power, high linearity differential amplifier with a capacitive input impedance: A low noise, low power differential two-stage amplifier includes a first stage comprising a pair of electrical devices that sense an input signal difference across the pair of electrical devices; and a control feedback loop operatively connected to the first stage, wherein the first stage in combination with the control... Agent: Rahman LLC

20090045878 - Amplifier: An amplifier includes a carrier amplifier which performs signal amplification at all times, a peak amplifier which operates only at a time when the high electric power is outputted, a combiner which combines the output from the carrier amplifier and the peak amplifier, and a distributor which distributes an input... Agent: Mcginn Intellectual Property Law Group, PLLC

20090045877 - Power amplifier circuit for multi-frequencies and multi-modes and method for operating the same: A multi-frequency and multi-mode power amplifier is provided. The amplifier has a carrier power amplifier and a peaking power amplifier. The carrier power amplifier receives a first signal and outputs a first amplified signal, in which a first transistor size adjusting unit is included to adjust an equivalent transistor size... Agent: Jianq Chyun Intellectual Property Office

20090045879 - Amplifier and method for operating the same: An amplifier includes an input terminal, an output terminal, a cascode circuit with a first and a second transistor serially coupled between an output terminal and a terminal of a predefined potential with a control terminal of the first transistor being coupled to the input terminal, a first bipolar transistor... Agent: Slater & Matsil LLP

20090039956 - Amplifier circuits, imager, system and method of operation: Systems, imagers, amplifiers and methods for use in operating a multi-channel amplifier. The multi-channel amplifier operates in a plurality of channels. A respective plurality of non-overlapping clock signals is generated for connecting a shared operational amplifier into respective portions of a switched-capacitor amplifier circuit. Between assertions of the non-overlapping clock... Agent: Trask Britt, P.C./ Micron Technology

20090039957 - Power amplifier and method for reducing common noise of power amplifier: A power amplifier including a delta-sigma modulation module, a differential programmable dead-time-control module, and an output stage module is provided. The delta-sigma modulation module integrates and quantizes an error between a differential-mode input signal and an output signal to generate a first and a second mean signal. The differential programmable... Agent: Jianq Chyun Intellectual Property Office

20090039958 - Operational amplifier with extended common-mode input range: An operational amplifier is provided with an extended common mode input range. This operational amplifier includes an input stage, a common mode feedback circuit, a current mirror, a replica input stage, and an output stage. The input stage couples to the CMFB circuit and replica input stage. The input stage... Agent: Garlick Harrison & Markison

20090039959 - Differential amplifier, method for amplifying signals of differential amplifier, and display driving device having differential amplifier: A differential amplifier includes input, output, current summing, and switch circuits. The input circuit generates first and second differential currents in response to a voltage difference between differential input signals. The output circuit includes a first and second transistors connected between a first voltage rail and output port and the... Agent: Mills & Onello LLP

20090039960 - Low power consuming mixed mode power amplifier: Provided is a low power consuming mixed mode amplifier. The power amplifier includes: a low output amplifier circuit generating a power amplified result having high efficiency in a low output mode the most frequently used; a high output amplifier circuit generating an amplified result having... Agent: Rabin & Berdo, PC

20090039961 - Low quiescent current output stage and method with improved output drive: Circuitry for increasing the maximum output current magnitude of a diamond buffer (Q57,58,74,75) having increased maximum output current provides a bias current of a first magnitude (I) into an emitter of a PNP first input transistor (Q57) and sinks a bias current of the first magnitude out of an emitter... Agent: Texas Instruments Incorporated

20090039962 - High frequency power amplifier and high frequency heating device: A high frequency power amplifier includes an amplification element, a harmonic control circuit, an output matching circuit, and a load resistor. A high frequency signal input from an input end is amplified in the amplification element, passes through the harmonic control circuit and the output matching circuit, and is then... Agent: Mcdermott Will & Emery LLP

20090039963 - Circuit for inhibiting over-current in power amplifier: A power amplifier drives a load connected to a first output terminal and a second output terminal. When generation of over-current is detected by the current detection section, the output amplifier control section is controlled to stop the operation of the output amplifier section, and when a voltage greater than... Agent: Cantor Colburn, LLP

20090039964 - Low-noise amplifier circuit and receiving system: In a broadband low-noise amplifier circuit to be used in a multichannel reception system, a capacitance of a variable capacitor (9) is controlled by a resonance frequency control circuit (4) so that a resonance frequency of a load unit (2) comprising the variable capacitor (9) and an inductor (10) matches... Agent: Steptoe & Johnson LLP

20090039965 - Low-loss electrical component with an amplifier: An electrical component includes an amplifier that includes an output stage, and a power-supply path for powering the output stage. The power supply path includes a line that includes conductor track sections in parallel. The electrical component also includes a carrier substrate containing the amplifier and the line with the... Agent: Fish & Richardson PC

20090039966 - Multi-stage rf amplifier including mmics and discrete transistor amplifiers in a single package: A MMIC amplifier stage and a discrete transistor amplifier stage are housed in a single package. In one aspect, a multi-stage RF amplifier includes a package with an RF input lead and an RF output lead. The signal path from the RF input lead to the RF output lead includes... Agent: Fenwick & West LLP

20090033412 - Remote audio amplifier monitoring system: An apparatus is provided for remotely monitoring a plurality of amplifiers on a display device. The amplifiers are provided to process audio signals and directly or indirectly connected to a network. In the apparatus, a collecting section collects a group code from each of the amplifiers through the network. The... Agent: Morrison & Foerster, LLP

20090033413 - Gain controlled amplifier and cascoded gain controlled amplifier based on the same: A gain controlled amplifier and a cascoded gain controlled amplifier based on the same are disclosed. The gain controlled amplifier includes an operational amplifier for amplifying an input signal, an input resistor connected to an input terminal of the operational amplifier, a feedback resistor connected to an output terminal of... Agent: Sughrue Mion, PLLC

20090033415 - Method and system for amplitude calibration for polar modulation with discontinuous phase: Aspects of a method and system for amplitude calibration for polar modulation with discontinuous phase may include amplifying a signal via a plurality of amplifiers such that a combined gain of the plurality of amplifiers comprises a coarse amplitude gain, an amplitude offset gain and a calibration gain. A gain... Agent: Mcandrews Held & Malloy, Ltd

20090033414 - Method and system for polar modulating ofdm signals with discontinuous phase: Aspects of a method and system for polar modulating OFDM signals with discontinuous phase may include amplifying an OFDM signal via a plurality of amplifiers such that a combined gain of the plurality of amplifiers comprises a coarse amplitude gain and an amplitude offset gain. A gain of one or... Agent: Mcandrews Held & Malloy, Ltd

20090033416 - Method and system for polar modulating qam signals with discontinuous phase: Aspects of a method and system for polar modulating QAM signals with discontinuous phase may include amplifying a signal via a plurality of amplifiers such that a combined gain of the plurality of amplifiers comprises a coarse amplitude gain and an amplitude offset gain. A gain of one or more... Agent: Mcandrews Held & Malloy, Ltd

20090033417 - Method and system for polar modulation with discontinuous phase for rf transmitters with power control: Aspects of a method and system for polar modulation with discontinuous phase for RF Transmitters with power control may include amplifying a signal via a plurality of amplifiers such that a combined gain of the plurality of amplifiers comprises a coarse amplitude gain, a power level gain and an amplitude... Agent: Mcandrews Held & Malloy, Ltd

20090033418 - Training sequence and digital linearization process for power amplifier: A training sequence and digital linearization process for a power amplifier are provided. In particular, a system for maintaining linear operation of an amplifier is includes an estimation component configured to determine compensation coefficients. The system further includes a digital pre-distorter configured to compensate for non-linear operation of the amplifier... Agent: Brian C. Oakes Tyco Electronics Corporation

20090033419 - Class d amplifier with increased efficiency: The present invention is a method of operating a speaker by converting an audio signal to a pulse-width modulated signal that has a plurality of positive pulses and a plurality of negative pulses as a function of the audio signal, then driving an H-bridge circuit interconnected to a speaker, wherein... Agent: Honeywell International Inc.

20090033420 - Operational amplifier circuit, constant voltage circuit using the same, and apparatus using the constant voltage circuit: A disclosed operational amplifier circuit with a multi-stage amplifier configuration provides fast-response and high withstand-voltage characteristics without using high withstand-voltage transistors as output transistors in its amplifying stages. The output voltage range of a differential amplifier circuit in a first stage is limited by voltage clamping based on a reverse... Agent: Dickstein Shapiro LLP

20090033421 - Differential input driver using current feedback and cross-coupled common base devices: A differential input driver circuit (10, 50) includes first and second transistors (Q0, Q3) as input transistors and third and fourth transistors (Q1, Q2) as diode-connected, cross-coupled transistors. In one embodiment, first, second, third and fourth transistors are NPN bipolar transistors. The base terminals of the first and third transistors... Agent: Patent Law Group LLP

20090033422 - Multi-level slew and swing control buffer: A buffer amplifier and an associated method have been provided for slew rate and swing level control in the buffering of a signal. The method accepts an input signal having a voltage swing, a swing control signal, and a slew rate control signal. The voltage swing for each output in... Agent: Gerald W. Maliszewski

20090033423 - Output buffer and power amplifier comprising thereof: The present invention relates an output buffer and a power amplifier having the same. The output buffer includes a push-pull circuit unit, an output unit, and a driver. The push-pull circuit unit includes transistors connected to each others in a push-pull formation between a high level power voltage and a... Agent: Buchanan, Ingersoll & Rooney PC

20090033424 - Radio receiver: There is provided a method that comprises identifying a parasitic signal transfer in a filter using a signal-directed graph; and adding compensation paths to the filter to reduce or eliminate the effect of the parasitic signal transfer A corresponding filter is provided which comprises a plurality of amplifier stages that... Agent: Nxp, B.v. Nxp Intellectual Property Department

20090033425 - Method and system for a highly efficient power amplifier utilizing dynamic biasing and predistortion: Aspects of a method and system for a highly efficient power amplifier (PA) utilizing dynamic biasing and predistortion are presented. Aspects of the system may include a processor that enables computation of a value of a variable bias component of a bias current based on a bias slope value and... Agent: Mcandrews Held & Malloy, Ltd

20090033426 - Pre-emphasis circuit: An amplifier stage or circuit for providing pre-emphasis. The circuit includes a first input node configured to receive a first data signal and a second input node configured to receive a second data. The circuit also includes an adjustable delay stage configured to at least partially produce a delay in... Agent: Workman Nydegger 1000 Eagle Gate Tower