Amplifiers inventions 01/08

20080024210 - Method and apparatus to correct an error in a switching power amplifier: An error correction method and apparatus to enhance performance of a switching power amplifier through digital feedback of an audio pulse width modulation (PWM) signal. The error correction apparatus includes a PWM unit to convert an audio signal into a PWM signal, a power stage unit to switch and amplify... Agent: Stanzione & Kim, LLP

20080024213 - Amplifier circuits, methods of starting and stopping amplifier circuits: An amplifier circuit (100) has an input stage (OP1) and an output stage (Q1, Q2) operating with different supply voltages and different quiescent voltages. The output stage has a feedback input connected to receive a feedback signal from the output of the output stage. A biasing circuit (602) applies a... Agent: Dickstein Shapiro LLP

20080024209 - Integrator and error amplifier: An integrator is provided with protection against drift in the value of an integral during power save mode. An N-bit counter (12) is driven by the output of a comparator (11) to provide a digital count representation of the integral. The digital count is fed as an input to a... Agent: Texas Instruments Incorporated

20080024211 - Multi-operational amplifier system: A multi-operational amplifier system comprises a plurality of operational amplifiers and a controller to configure the plurality of operational amplifiers. The operational amplifiers may be selectively configured to operate individually or in combination with other of the operational amplifiers. The operational amplifiers may have different common node inputs. In one... Agent: Dla Piper US LLP

20080024212 - Amplifier circuit: The present invention provides an amplifier circuit comprising a differential amplifier and a negative feedback loop circuit, in which a positive feedback loop circuit having a gain smaller than a gain of the negative feedback loop circuit is formed inside the negative feedback loop circuit.... Agent: Rader Fishman & Grauer PLLC

20080024214 - Power amplifier circuit for peak envelope modulation of high frequency signal: A power amplifier circuit for peak envelope modulation of a high frequency signal is provided. The power amplifier circuit includes a transformer which receives a first signal greater than a predetermined level of an envelope of a carrier signal to generate a transformed signal, and a transistor which operates based... Agent: Sughrue Mion, PLLC

20080024215 - Data sampler including a first stage and a second stage: A data sampler including a first stage and a second stage. The first stage is configured to receive differential signals and provide a first edge rate in a first output signal and a second edge rate in a second output signal based on the differential signals. The second stage is... Agent: Dicke, Billig & Czaja

20080024216 - Switching audio power amplifier and method for pop noise suppression: A switching audio power amplifier and a method for pop noise suppression. The switching audio power amplifier includes a pulse width modulation (PWM) signal generator for generating a PWM signal; a counter for generating counting values k1˜kN in N time intervals according to the PWM signal; N switch transistors connected... Agent: Birch Stewart Kolasch & Birch

20080024218 - Amplifier stage, operational amplifier and method for amplifying a signal: An amplifier stage includes a first and a second signal path having a series connection of a first transistor of a first conduction type which forms a control input for receiving an input signal to the amplifier stage and a second transistor of a second conduction type. The amplifier stage... Agent: Eschweiler & Associates, LLC National City Bank Building

20080024217 - Rail-to-rail operational amplifier with an enhanced slew rate: A rail-to-rail operational amplifier is provided with a high-side current adjusting circuit and a low-side current adjusting circuit. On a basis of a comparison between a first input voltage and a second input voltage, the high-side current adjusting circuit adjusts a high-side bias current. Under a condition that the first... Agent: North America Intellectual Property Corporation

20080024219 - Apparatus and method for biasing cascode devices in a differential pair using the input, output, or other nodes in the circuit: A differential amplifier is configured in a cascode configuration that includes input transistors that are connected to corresponding cascode transistors. The gates of the cascode transistors are tied together to form a common bias for the cascode devices. The input transistors of the differential amplifier receive a differential input signal... Agent: Sterne, Kessler, Goldstein & Fox P.l.l.c.

20080024220 - Gain-controlled amplifier: A gain-controlled amplifier is disclosed including: a set of switches; first and second transistors whose second terminals are coupled to each other via a resistive element; a first current mirror, coupled to a first terminal of the first transistor, for providing a set of first currents; a second current mirror,... Agent: North America Intellectual Property Corporation

20080024221 - Integrated low power received signal strength indicator (rssi) with linear characteristic: An RSS indicator with a linear characteristic that is of a simple configuration, low current consumption and small die area requirements, comprises a pair of input transistors with coupled emitters and base electrodes to which an input signal is differentially applied. Each of the input transistors has a collector load... Agent: Texas Instruments Incorporated

20080024222 - Voltage level shifting circuit, a differential input stage circuit, and a method for providing a level shifted differential signal to a differential input buffer circuit: A voltage level shifting circuit (5) for shifting the common mode voltage of a differential signal to be within the working range of a differential input buffer circuit (3) comprises a first resistive voltage divider circuit (18) coupled between a first input terminal (10) and a voltage reference terminal (15)... Agent: Wolf Greenfield & Sacks, P.C.

20080024223 - Circuit for improving amplification and noise characteristics for mosfet, and frequency mixer, amplifier and oscillator using the circuit: A circuit for improving amplification and noise characteristics of a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), and a frequency mixer, an amplifier and an oscillator using the circuit are provided. A gate terminal of the MOSFET is connected to a body terminal of the MOSFET through a capacitor and the gate and... Agent: The Webb Law Firm, P.C.

20080024224 - Low noise amplifier with low current consumption: The invention relates to an amplifier circuit comprising supply terminals (12, 14) for supplying the circuit with first and second supply potentials (Vdd, Vss); a current path, which runs from the first supply terminal (12) via a first biased transistor (P1a, P1b), a first node (K1a, K1b), an input transistor... Agent: Pearne & Gordon LLP

20080024225 - Rf power amplifier: Transmission in DCS1800, PCS1900, and WCDMA1900 is performed by a common second RF power amplifier. In DCS1800 and DCS1900, transmission power is set in a high transmission power mode at 33 dBm by a high-gain input amplifier to activate an internal voltage follower of a bias circuit, and in WCDMA1900,... Agent: Mattingly, Stanger, Malur & Brundidge, P.C.

20080024226 - Inverting amplifier: A conventional inverting amplifier has a problem that an oscillation may be induced depending on a structure of an internal amplifier. This invention offers an inverting amplifier having a multi-stage amplifier that is provided with a first transistor that amplifies an input signal, a second transistor that amplifies an output... Agent: Morrison & Foerster LLP

20080024227 - Communication semiconductor integrated circuit device and wireless communication system: The present invention provides a communication semiconductor integrated circuit device equipped with a high-frequency power amplifier circuit including a gain control amplifier and a bias circuit which supplies such a bias current as to linearly change the gain of the gain control amplifier, and a wireless communication system using the... Agent: Mattingly, Stanger, Malur & Brundidge, P.C.

20080024228 - Hybrid output stage apparatus and related method thereof: The present invention discloses an apparatus for generating an output signal according to an input signal, including a signal generating circuit for generating a first and a second control signal according to the input signal; a first output stage has a first amplifying configuration for receiving the first control signal;... Agent: North America Intellectual Property Corporation

20080024229 - Stacked rf power amplifier: A method and apparatus provides techniques for electrically isolating switching devices in a stacked RF power amplifier, which prevents the switching devices from being subjected to high breakdown voltages. The isolation provided allows the power amplifier to be implemented on an integrated circuit.... Agent: Johnson & Associates

20080018392 - Minimizing switching noise and its effects in auto-zeroed amplifiers: Two nulling amplifiers are used with an auto-zeroed differential amplifier. While one nulling amplifier is compensating the main amplifier, the other nulling amplifier is being zeroed for both differential mode (DM) and common mode (CM) offsets. By using two nulling amplifiers, one always connected to the main amplifier, a relatively... Agent: Baker Botts L.L.P. One Shell Plaza

20080018393 - Offset voltage correction circuit and class d amplifier: An offset voltage correction circuit for a differential amplifier comprising NMOS transistors serving as a pair of differential transistors, and PMOS transistors serving as a pair of load transistors connected between outputs of the pair of differential transistors and a power source. The offset voltage correction circuit is equipped with... Agent: Pillsbury Winthrop Shaw Pittman LLP

20080018395 - Anti-pop circuit: The present invention provides an anti-pop circuit composed of a capacitor and a switch. A control signal is used to switch the switch to make the capacitor grounded. The grounded capacitor may shunt the “pop” sound at the moment the power (Vcc) is turned on or off.... Agent: Birch Stewart Kolasch & Birch

20080018397 - Single-ended screen-regulated cathode-follower output stage for high-fidelity music amplifier: A novel single-ended screen-regulated cathode-follower output topology for implementing vacuum-tube audio power amplifiers for the reproduction of high-fidelity music with minimal audible distortion. The screen regulation substantially reduces the distortions and noise in the current fed to the output tube by a non-regulated power supply. The noise and distortion of... Agent: Martin G. Reiffin

20080018394 - Operational amplifier and method for canceling offset voltage of operational amplifier: An operational amplifier that cancels offset voltage while enabling its gain to be set to any value. The operational amplifier includes a first switch for short-circuiting the gates of two transistors in a first differential input unit. A capacitor is connected to the gates of two transistors in a second... Agent: Arent Fox LLP

20080018396 - Wideband hyperfrequency detection device: The present invention relates to a hyperfrequency detection module. It also relates to a wideband hyperfrequency detection device comprising one or more detection modules. The detection module comprises includes: a distributed amplifier (50) having N field-effect transistors (55), and a common drain line (56), a common gate line (54). The... Agent: Lowe Hauptman & Berner, LLP

20080018399 - Multistage amplifier apparatus with distortion compensation function: Provided are an amplifier section in which N amplifiers (N is an integer of 2 or more) are serially connected to one another, and which performs an amplitude modulation on an input signal using an amplitude signal, which is a control signal; and M distortion compensation apparatuses (M is a... Agent: Wenderoth, Lind & Ponack L.L.P.

20080018398 - Tunable predistorter: The present invention relates to an analog predistorter (100) having a tunable amplitude (60) and/or phase (80) expansion. The predistorter (100) includes a coupler (110) having an input port (112), an output port (114), a first (116) and a second (118) coupled port separated by 90 degrees. A first compensation... Agent: Nixon & Vanderhye, PC

20080018400 - Differential amplifier and method: A method of forming a differential amplifier on a substrate which has a greater tolerance for applied voltages and a chip so formed. The differential amplifier circuit on a substrate has additional transistors connected with resistors which form a voltage divider, thereby sharing the voltage stress which may be applied... Agent: Ibm Corporation

20080018401 - Variable gain amplifier with wide gain variation and wide bandwidth: A variable gain amplifier including: a differential amplification unit amplifying and outputting a difference between a first input signal and a second input signal inputted via a first input terminal and a second input terminal, respectively, according to a first bias current of the first input terminal and second input... Agent: Lowe Hauptman Ham & Berner, LLP

20080018402 - Systems and arrangements for sensing current with a low loss sense element: In accordance with the present disclosure current sensing methods, apparatuses and arrangements are disclosed. The arrangement can include a sense element to convey a current from a source to a load and a compensation element can be located proximate to the sense element. The compensation element can have a resistance... Agent: Schubert Osterrieder & Nickelson PLLC C/o Intellevate

20080018403 - High frequency amplifier having attenuator: An amplifier for amplifying a reception signal, having an input terminal for inputting the reception signal from an antenna, has a grounded gate transistor of which gate is grounded in a high frequency manner and of which source is connected to the input terminal, a load element disposed between the... Agent: Arent Fox LLP

20080018404 - Fast charge circuit for use in amplifiers: According to an exemplary embodiment, an amplification module includes a bias circuit coupled to an input of an amplifier, where the bias circuit is configured to charge the input of the amplifier to a final bias voltage. The amplification module further includes a fast charge circuit configured to provide a... Agent: Farjami & Farjami LLP

20080018405 - Ultra wide band, differential input/output, high frequency amplifier in an integrated circuit: A wide band amplifier includes a core amplifier having input terminals and output terminals for, respectively, receiving differential input signals and providing amplified differential output signals. A bandwidth peaking network is coupled to the core amplifier and includes (a) a first coil and a first resistor connected in series and... Agent: Ratnerprestia

20080012634 - Programmable gain amplifier: A programmable gain amplifier includes an OP amplifier, N decayed capacitor(s), (N+1) adjusting capacitor modules, switches, a switch control module, and a feedback switch. First terminals of adjusting capacitors of the capacitor modules are connected together. One capacitor module is connected to an input terminal of the OP amplifier, and... Agent: Birch Stewart Kolasch & Birch

20080012635 - Multiple power mode amplifier with bias modulation option and without bypass switches: A multiple power mode amplifier provides a low and a high power mode without using switches. This amplifier may be used in radio frequency (RF) applications such as mobile telephones, pagers, portable digital assistants, and wireless e-mail devices. In the low power mode, the power consumption of the amplifier is... Agent: Townsend And Townsend And Crew, LLP

20080012636 - Electric amplifier and method for the control thereof: A method for controlling an electric amplifier is provided. The method includes monitoring a closed-loop control signal of a regulator, which triggers an end stage of the amplifier; adjusting the closed-loop control signal as a function of an output signal of the end stage; comparing the closed-loop control signal with... Agent: Brinks Hofer Gilson & Lione

20080012637 - Radio frequency power amplifier circuit and method: A method (200) and radio frequency amplifier circuit (100) for adjusting a gain setting of a power amplifier (102) and a gain setting of a power amplifier driver (106) that form part of the radio frequency amplifier circuit (100). The method (200) includes selecting (220) a power output value for... Agent: Motorola, Inc.

20080012638 - Power supply apparatus, amplifier apparatus, radio apparatus and reproducing apparatus: A power supply apparatus which supplies power to an amplifier, includes: a regulator stabilizing a voltage of the power supplied to the amplifier; and a stabilizing controller obtaining an amplitude level of an input signal inputted to the amplifier and controlling a stability of the voltage by the regulator based... Agent: Oblon, Spivak, Mcclelland Maier & Neustadt, P.C.

20080012639 - Dual mode audio amplifier: A dual mode power amplifier for an audio signal operates in linear mode at lower levels of the audio signal and in switched mode (Class D) at higher levels of the audio signal.... Agent: Philips Intellectual Property & Standards

20080012640 - Unilateralized amplifier: The effect of input signal frequency on the output of a differential amplifier is reduced by connecting the conductor of each of the input signal components to the respective conductor of the output signal component of opposite phase with a capacitor substantially equal to the parasitic capacitances interconnecting the terminals... Agent: Chernoff, Vilhauer, Mcclung & Stenzel

20080012641 - Operational amplifier: An operational amplifier includes a differential amplifier circuit provided at an input stage and an amplifier circuit at a post stage. In the differential amplifier circuit, first and third bipolar transistors are PNP-type bipolar transistors and Darlington-connected. An inverting input terminal is connected to the base terminal of the first... Agent: Cantor Colburn, LLP

20080012642 - Serial link receiver with wide input voltage range and tolerance to high power voltage supply: A circuit device and method for designing a serial link receiver, which accommodates a wide input voltage range and provides tolerance to high termination voltages. The receiver is designed with a pair of RC networks connected inline between the input and the preamplifier and a common mode feedback loop, which... Agent: Dillon & Yudell LLP

20080012643 - Tunable cascode lna with flat gain response over a wide frequency range: A cascode LNA circuit is provided with a tuned inductive load. The circuit shows a flat response over a wide frequency range.... Agent: Nxp, B.v. Nxp Intellectual Property Department

20080012644 - Rf power sensor with chopping amplifier: An RF power detector having a wide dynamic range may comprise a chopping amplifier and is configured to detect pulsed high frequency RF signals. The chopping amplifier controlled by a bias current regulator amplifies and chops an RF signal by periodically enabling and disabling the amplifier according to a system... Agent: Snell & Wilmer L.L.P. (main)

20080012645 - Thermally distributed integrated power amplifier module: An integrated power amplifier (PA) module formed on a substrate includes a first cluster of transistor cells positioned in a first portion of the substrate; a second cluster of transistor cells positioned in a second portion of the substrate and spaced apart from the first portion; and a combiner coupled... Agent: Tran & Associates

20080007327 - Multiple power mode amplifier with bias modulation option and without bypass switches: A multiple power mode amplifier provides a low and a high power mode without using switches. This amplifier may be used in radio frequency (RF) applications such as mobile telephones, pagers, portable digital assistants, and wireless e-mail devices. In the low power mode, the power consumption of the amplifier is... Agent: Townsend And Townsend And Crew, LLP

20080007328 - Multiple power mode amplifier with bias modulation option and without bypass switches: A multiple power mode amplifier provides a low and a high power mode without using switches. This amplifier may be used in radio frequency (RF) applications such as mobile telephones, pagers, portable digital assistants, and wireless e-mail devices. In the low power mode, the power consumption of the amplifier is... Agent: Townsend And Townsend And Crew, LLP

20080007329 - Multiple power mode amplifier with bias modulation option and without bypass switches: A multiple power mode amplifier provides a low and a high power mode without using switches. This amplifier may be used in radio frequency (RF) applications such as mobile telephones, pagers, portable digital assistants, and wireless e-mail devices. In the low power mode, the power consumption of the amplifier is... Agent: Townsend And Townsend And Crew, LLP

20080007331 - Multiband doherty amplifier: A multiband Doherty amplifier having a configuration including a divider which divides an input signal into two, a carrier amplifier which amplifies one of the divided signals, a delay element which delays the other divided signal, a peak amplifier which amplifies the output signal of the delay element, an impedance... Agent: Oblon, Spivak, Mcclelland Maier & Neustadt, P.C.

20080007330 - Power amplifier system: A multiple input multiple output power amplifier system includes multiple main amplifiers for amplifying corresponding independent input signals. A common control unit forms a composite signal from the independent input signals. The composite signal is amplified by a peaking amplifier and forwarded to an output network where main amplifier output... Agent: Ericsson Inc.

20080007332 - Multiband dynamic range control graphical interface: A graphical user interface is provided for dynamic gain control that allows a user to view and adjust multiple frequency bands and multiple controllers using a single screen in a simple and visually appealing way. Each controller within each particular frequency band may be easily modified to allow thresholds to... Agent: Beyer Weaver LLP

20080007333 - Method and apparatus for controlling a power amplifier in a mobile communication system: A power amplification controlling apparatus and method in a mobile communication system are provided. An amplifying part amplifies an input Radio Frequency (RF) signal with a power supply voltage. A bias adaptation part detects a change in at least one an operation and an environment of the amplifying part, attenuates... Agent: Roylance, Abrams, Berdo & Goodman, L.L.P.

20080007334 - Tuneable circuit for canceling third order modulation: A CMOS transconductor for cancelling third-order intermodulation is provided. The transconductor includes a transconductance circuit and a tuneable distortion circuit. The transconductance circuit takes an input voltage and generates an output current having a transconductance element and an IM3 element. The distortion circuit takes the same input voltage and generates... Agent: Borden Ladner Gervais LLP Anne Kinsman

20080007335 - Power amplifier: A power amplifier based on a voltage-coupling scheme is disclosed. The power amplifier includes two active elements connected to each other via a primary part of a transformer, in which one of the two active elements is connected to a power-supply voltage of the amplifier, the other one is connected... Agent: Oliff & Berridge, PLC

20080007336 - Method and device for the reduction of the dc component of a signal transposed into baseband, in particular in a receiver of the direct conversion type: A method is for reducing a DC component of an input signal transposed into baseband and being generated by a first frequency transposition stage starting from an initial signal and from a transposition signal. The method includes amplifying the transposed input signal in a first amplifier. The first amplifier receives... Agent: Allen, Dyer, Doppelt, Milbrath & Gilchrist P.A.

20080007337 - Distributed class g type amplifier switching method: An improved Class G type amplifier which switches between multiple power rails depending upon the instantaneous amplitude of the input signal versus the power rails. The low voltage (inner) amplifier includes a plurality of parallel amplifier devices, and the high voltage (outer) amplifier includes a plurality of parallel amplifier devices.... Agent: Townsend And Townsend And Crew, LLP

20080007338 - Regulated cascode circuit, an amplifier including the same, and method of regulating a cascode circuit: A regulated cascode circuit includes a first PMOS FET and a second PMOS FET connected in series between a first terminal that receives a first supply voltage and an output terminal, a first NMOS FET and a second NMOS FET connected in series between the output terminal and a second... Agent: Mills & Onello LLP

20080007339 - Transmitter apparatus with extended gain control: A transmitter includes a first variable gain amplifier (VGA) and a second VGA coupled to an output of the first VGA. The first and second VGAs each comprise a plurality of parallel gain stages. Gains of the first and second VGAs are equal to the sum of the gains of... Agent: Sterne, Kessler, Goldstein & Fox P.l.l.c.

20080007340 - Digitally adjusted variable gain amplifier (vga) using switchable differential pairs: A variable gain amplifier including a stage. The stage having a set of switchable differential pairs. The stage providing a gain range to a signal and adjusting a gain of the signal. At least one differential pair in each stage is permanently enabled. The variable gain amplifier may include a... Agent: Brake Hughes Bellermann LLP

20080007341 - Automatic bias control circuit for reduced current consumption in a linear power amplifier: According to an exemplary embodiment, an amplification module includes a power amplifier configured to receive an RF input signal and provide an RF output signal. The amplification module further includes an autobias control circuit configured to receive and convert the RF output signal to a control signal. The control signal... Agent: Michael Farjami, Esq. Farjami & Farjami LLP

20080007342 - Power amplifier: A power amplifier is described that includes an amplification circuit and a linear regulator. The amplification circuit amplifies an input signal to produce an output signal and provides a feedback signal for tracking the expected power requirements of the output signal. The linear regulator is connectable for receiving as inputs... Agent: Bereskin And Parr

20080007344 - Dc offset cancellation for a trans-impedance amplifier: The invention relates to a DC offset cancellation circuit for a trans-impedance amplifier, which is typically used for converting an input current from a photodiode into an output voltage. The DC offset cancellation circuit utilizes the monitor current from a photodiode monitoring device to cancel the DC offset from the... Agent: Allen, Dyer, Doppelt, Milbrath & Gilchrist P.A.

20080007343 - Tuning a trans-impedance amplifier: A trans-impedance amplifier has a front-end circuit including a transistor and collector resistor for setting the open-loop gain of the feedback circuit. The collector resistor, when connected directly to the power supply, has a secondary function of defining the current through the gain transistor, affecting second-order characteristics. A current source... Agent: Allen, Dyer, Doppelt, Milbrath & Gilchrist P.A.