Amplifiers inventions 06/09

20090160547 - Method and system for transitioning between operation states in an output system: A closed loop amplifier system comprising a modulator that provides a pulse-width modulated (PWM) output signal based on an input signal, the modulator having a variable closed loop transfer function. The system also comprises a ramp generator that provides a ramp signal to the modulator, the variable closed loop transfer... Agent: Texas Instruments Incorporated

20090160548 - Power amplifying apparatus: A power amplifying apparatus includes a high-speed low pass filter which inputs an envelope signal included in a transmission signal therein, a low-speed low pass filter which inputs the envelope signal therein, a determination unit which inputs the envelope signal therein and determines rising or falling of the envelope signal,... Agent: Katten Muchin Rosenman LLP

20090160549 - Linearised power amplifier: A linearised power amplifier including a predistorter and a feedforward circuit is described. By using both a predistorter and a feedforward cancellation system the linearisation of the amplifier is increased. The accuracy of the amplified signal may be further improved by training the predistorter using the error signal produced by... Agent: Barnes & Thornburg LLP

20090160550 - Predistorter: A predistorter for correcting distortion caused by a memory effect in amplifying a signal by an amplifier is provided. In the memory PD 2 provided to the predistorter, the level detection means 21 detects the level of the signal, the coefficient output means 22 outputs the coefficient corresponding to the... Agent: Wenderoth, Lind & Ponack, L.L.P.

20090160552 - Apparatus and method for class d amplifier with sampling rate conversion: A class D amplifier is provided. The class D amplifier includes an interpolator, a sampling rate converter, a pulse width modulator, a sigma-delta modulator, and a pulse width modulation (PWM) pulse generator (PPG). The sampling rate converter interpolates the output of the interpolator such that the sampling rate converter up-samples... Agent: Zoran Corporation C/o Darby & Darby PC

20090160553 - Distortion suppression circuit for digital class-d audio amplifier: A digital Class-D amplifier distortion suppression circuit design is disclosed. A distortion suppression feedback loop is described to improve audio performance by suppressing output stage non-linearity and improving power supply noise rejection achieving reduced THD+N. The feedback loop is placed around the power stage. It forces tracking between the audio... Agent: Vern Maine & Associates

20090160551 - Switching amplifier: A switching amplifier includes an input end for receiving an input signal, a reference signal reception end for receiving a reference signal, a feedback end for receiving a feedback signal, an output end for outputting an output signal, an integration circuit for performing integration operation on the input signal according... Agent: North America Intellectual Property Corporation

20090160554 - Amplifier arrangement: A gain-controlled RF amplifier system has an input node and an output node. The system has a plurality of amplifier devices, selectively connectable between the input node and the output node. The amplifier devices are placed in circuit according to a measured gain derived by comparing a magnitude of a... Agent: Maier & Maier, PLLC

20090160555 - Apparatus for power amplification based on envelope elimination and restoration (eer) and push-pull switching: A power amplifying apparatus based on envelope elimination and restoration (EER) includes a voltage amplifier to amplify a high frequency component of an envelope signal, a switching amplifier to generate a low frequency component signal of a drain bias based on a first pulse width modulation (PWM) signal that corresponds... Agent: JeffersonIPLaw, LLP

20090160556 - System and method for providing a configurable inductor less multi-stage low-noise amplifier: In accordance with a particular embodiment of the present invention, an apparatus is offered that includes a configurable feedback low noise amplifier (LNA) connected to a common source connected input transistor to realize a specific value of an input impedance, the input impedance being controlled by transconductance, the overall gain... Agent: Baker Botts L.L.P.

20090160557 - Self-biased cascode current mirror: A self-biased cascode current mirror circuit, including a first transistor having a first current electrode, a control electrode, and a second current electrode; a second transistor having a first current electrode coupled to the second current electrode of the first transistor, a control electrode coupled to the first current electrode... Agent: Dickstein Shapiro LLP

20090160558 - Rf amplifier: Provided is a radio frequency (RF) amplifier. The RF amplifier includes an amplification circuit amplifying an RF signal, a bias voltage generation circuit supplying a bias voltage of the amplification circuit, and a first bias resistor connected between the amplification circuit ad the bias voltage generation circuit, and having a... Agent: Ampacc Law Group

20090160559 - Integrated circuit including impedance to provide symmetrical differential signals: One embodiment provides an integrated circuit including an input stage and an impedance. The input stage is configured to receive a single-ended input signal and provide a differential output signal. The impedance is configured to receive the single-ended input signal and provide compensation to the input stage to provide symmetrical... Agent: Dicke, Billig & Czaja

20090153241 - Simultaneous filtering and compensation circuitry and method in chopping amplifier: A chopper-stabilized amplifier (1B) having a first output (25) includes an input chopper (9) for chopping an input signal and applying it to the input of a first amplifier (2) and an output chopper (10) for chopping an output signal of the first amplifier and applying it to the input... Agent: Texas Instruments Incorporated

20090153242 - Method and apparatus for direct digital to radio frequency conversion: A method and apparatus for direct conversion of digital data to high power RF signals, known as DDRF. The method and apparatus receive a digital signal, create a digital modulated signal therefrom, and amplify the modulated signal with an H-bridge Power Amplifier for transmission. DDRF uses a multi-level H-bridge amplification... Agent: Motorola, Inc.

20090153243 - Class d amplifier: A single-end-output class D amplifier is provided that handles a load such as stereo headphones without using an expensive part such as a crystal resonator or transformer. Class D amplifier 200 is equipped with PWM circuits 221 and 222 that perform PWM modulation of an input signal and output two... Agent: Greenblum & Bernstein, P.L.C

20090153244 - Low noise and low input capacitance differential mds lna: A differential low noise amplifier (LNA) involves two main amplifying transistors biased in saturation, and two cancel transistors biased in sub-threshold. In one example, the gates of the cancel transistors are coupled to the drains of main transistors, in a symmetrical and cross-coupled fashion. The main transistors are source degenerated.... Agent: Qualcomm Incorporated

20090153246 - Method and system for varying gain exponentially with respect to a control signal: A method for varying gain exponentially with respect to a control signal is provided. The method includes receiving a primary control signal. A secondary control signal is generated based on the primary control signal. The secondary control signal is provided to a variable gain amplifier and is operable to exponentially... Agent: Stmicroelectronics, Inc.

20090153245 - Variable-gain wide-dynamic-range amplifier: A variable-gain wide-dynamic-range amplifier including an amplifier module, a control unit, and an output current regulating circuit is provided. The amplifier module amplifies an input signal. The amplifier module includes several amplifier units coupled to each other in parallel. The gains of the amplifier units are different. The control unit... Agent: Thomas, Kayden, Horstemeyer & Risley, LLP

20090153247 - High-speed, multi-stage class ab amplifiers: A multi-stage Class AB amplifier system comprises a first Class AB amplifier circuit that receives an input signal. A bias circuit receives an output of the first Class AB amplifier circuit. A second Class AB amplifier circuit having an input that communicates with an output of the bias circuit and... Agent: Harness, Dickey & Pierce P.L.C

20090153248 - Amplifier with dynamic bias: Techniques are provided for dynamically biasing an amplifier to extend the amplifier's operating range while conserving power. In an embodiment, a detector is provided to measure the amplifier output to determine an operating region of the amplifier. The output of the detector may be input to a bias adjuster, which... Agent: Qualcomm Incorporated

20090153249 - Rail to rail buffer amplifier: A buffer amplifier having a wide output voltage range includes a first source follower circuit having a first current source and a first transistor, and a second source follower circuit having a second current source and a second transistor. The first source follower circuit has an output terminal connected to... Agent: Freescale Semiconductor, Inc. Law Department

20090153250 - Method and system for scaling supply, device size, and load of a power amplifier: Aspects of a method and system for scaling supply, device size, and load of a power amplifier (PA) are provided. In this regard parameters of a PA, and a voltage, a current, and/or a load of the PA may be configured based on a determined amplitude of a baseband signal... Agent: Mcandrews Held & Malloy, Ltd

20090153251 - Voltage detection type overcurrent protection device for class-d amplifier: The present invention discloses a voltage detection type overcurrent protection device, which applies to the output stage of a CMOS Class-D audio amplifier. Generally, a Class-D audio amplifier is used to drive a high-load loudspeaker; therefore, it needs a high-current driver. When there is a short circuit in the load,... Agent: Sinorica, LLC

20090146736 - Baseband-derived rf digital predistortion: A baseband-derived RF predistortion system using a lookup table having coefficients extracted at baseband and then applied at RF by means of a vector modulator. The architecture combines the narrowband advantage of envelope predistortion with the accuracy of baseband predistortion, and including compensation for memory effects. A polynomial-based alternative is... Agent: Law Offices Of James E. Eakin

20090146737 - Class-d amplifier and multi-level output signal generated method thereof: A class-D amplifier and a method of generating a multi-level output signal thereof are provided. The class-D amplifier includes a controlling logic circuit and an output module. The controlling logic circuit analyzes the amplitude of an input signal to generate a voltage modifying signal. A power supply provides a voltage... Agent: Jianq Chyun Intellectual Property Office

20090146738 - Operational amplifier: The operational amplifier adapting to a source driver is provided herein. The operational amplifier includes the input module, the first and the second current mirror module, the switch control module and output stage module, wherein the input module includes the first and the second differential pairs. The first current mirror... Agent: J C Patents, Inc.

20090146739 - Optical receiver and amplifier and photocoupler using the same: In an optical receiver and amplifier and an optical coupler, a technique for stabilize operations at turning on/off of a power supply by a simple configuration is desired. An optical receiver and amplifier includes: a photodiode generates a photocurrent in response to a light input; an output section outputs output... Agent: Sughrue Mion, PLLC

20090146740 - Average power efficiency enhancement and linearity improvement of microwave power amplifiers: A biasing circuit is used to provide low distortion and high efficiency operation of a microwave power amplifier. The biasing circuit utilizes the nonlinear rectified current of a microwave diode or transistor for biasing the amplifying transistor self-adaptively. The biasing current not only reduces the DC bias power during low-power... Agent: Heslin Rothenberg Farley & Mesiti PC

20090146741 - High-frequency amplifier, high-frequency module, and mobile wireless apparatus using the same: A high-frequency amplifier with high linearity is provided that is easy to integrate and is resistant to variations in transistor characteristics due to process variation. The high-frequency amplifier includes a bias circuit to bias an amplifying element that amplifies high frequencies. The bias circuit has a feedback circuit including a... Agent: Stanley P. Fisher Reed Smith LLP

20090140802 - Semiconductor integrated circuit: The present invention is directed to reduce offset error voltage in a signal source impedance of analog input signal voltage supplied to an input terminal due to input offset voltage of an operational amplifier in a sampling circuit or a multiplexer coupled to an input terminal of an A/D converter.... Agent: Miles & Stockbridge PC

20090140803 - Amplifiers with compensation: An amplifier system includes a first amplifier stage having an input and an output. A second amplifier stage has an input and an output, the input of the second amplifier stage being connected to the output of the first amplifier stage. A transistor has a control terminal, a first terminal,... Agent: Harness, Dickey & Pierce P.L.C

20090140804 - Method and apparatus for improving the performance of mimo wireless systems: Method and apparatus for efficiently providing DC power enhancement to power amplifiers each of which being arranged in a MIMO system, by suing an enhancement circuitry with a plurality of inputs and outputs. Each input has a corresponding DC enhancement output that is connected to a DC enhancement input of... Agent: Marsteller & Associates

20090140805 - Voltage regulator for biasing current-to-voltage amplifiers: A voltage regulator, comprising an analog amplifier, a noise filter and a signal compensator, is disclosed. The noise filter for receives a first signal containing alternating current (AC) noise in which the noise filter substantially filters the AC noise from the first signal to thereby produce a second signal. The... Agent: Conley Rose, P.C. David A. Rose

20090140806 - Distortion-compensation amplification apparatus and distortion compensation method: Distortion-compensation amplification apparatus that can obtain an appropriate error vector magnitude without increasing power consumption and can suppress the distortion of a transmission signal appropriately. A distortion compensation section applies distortion compensation to the transmission signal. An amplification section amplifies the transmission signal to which distortion compensation has been applied... Agent: Katten Muchin Rosenman LLP

20090140807 - Differential amplifier circuit: A differential amplifier circuit has first and second transistors composing a differential pair; a first inductor connected between the output terminal of the first transistor and a power source; a second inductor connected between the output terminal of the second transistor and the power source; a first transmission gate connected... Agent: Leydig Voit & Mayer, Ltd

20090140808 - Gain control circuit: A gain control circuit including a resistor with a first terminal and a second terminal; an operational amplifier with an inverting terminal thereof electrically coupled to said first terminal of said resistor; a non-inverting terminal thereof; and an output terminal thereof; an amplifier circuit for transforming the voltage change of... Agent: Troutman Sanders LLP Bank Of America Plaza

20090140809 - High performance variable gain amplifier, method of use and design structure: A circuit of high performance variable gain amplifier, method of use and design structure on which the subject circuit resides is provided. The circuit comprises a plurality of differential stages having a common input, and output, a common control level input CM and respective individual control level inputs Cx. The... Agent: Andrew M. Calderon Greenblum & Bernstein, P.L.C

20090140810 - Variable gain amplifier: The present invention relates to a variable gain amplifier. The variable gain amplifier in an ultrasound includes an attenuator. The attenuator includes resistor strings each having a plurality of resistors connected in series to each other and a gain control unit. The gain control unit has tap inputs taken from... Agent: Jones Day

20090140811 - Amplifying circuit: First and second voltage buffers are added to an amplifying circuit including input and output amplifying stages in which a P-MOS transistor and an N-MOS transistor operate as a push-pull circuit. An input of the first voltage buffer is connected to an output of the amplifying circuit, and an output... Agent: Studebaker & Brackett PC

20090140812 - High-linearity complementary amplifier: A complementary amplifier includes an NMOS transistor coupled to a PMOS transistor in a stacked configuration. The NMOS transistor and the PMOS transistor receive and amplify an input signal. The NMOS and PMOS transistors operate as a linear complementary amplifier and provide an output signal. The NMOS and PMOS transistors... Agent: Qualcomm Incorporated

20090140813 - Received signal gain control method and radio frequency signal receiving apparatus: A radio signal receiving apparatus receiving a radio signal over a radio channel generates a first amplified signal by amplifying the radio signal with a first gain, and determines the first gain by measuring the strength of the first amplified signal. In addition, the radio signal receiving apparatus generates a... Agent: Cantor Colburn, LLP

20090140815 - Low noise amplifier for ultra wide band: A low noise amplifier (LNA) for ultra wide band receives and amplifies identical RF signals in different frequency bands, and includes more than one pair of narrow band LNAs coupled in parallel, and a load circuit which increases load impedance of the entire circuit of the narrow band LNAs. The... Agent: Sughrue Mion, PLLC

20090140814 - Rf power amplifier: An RF power amplifier includes a plurality of amplifier cells. Each amplifier cell includes a bipolar transistor and a base circuit that comprises an RF coupling capacitor, a bias resistor, a base capacitor, and a base resistor. The base circuit transmits DC bias current and an RF signal to the... Agent: Dla Piper LLP (us )