Amplifiers inventions 07/07

20070170982 - Circuit utilizing op-sharing technique and related method thereof: The present invention provides a circuit that utilizes OP-sharing technique. The circuit includes an amplifier, a first application circuit, a second application circuit, and a reset circuit. The first application circuit drives the amplifier during at least a first working period. The second application circuit drives the amplifier during at... Agent: North America Intellectual Property Corporation

20070170983 - Multi-channel digital amplifier, signal processing method thereof, and audio reproducing system having the same: A multi-channel digital amplifier system to generate a pulse width modulation (PWM) signal having a different switching frequency in each channel, and a signal processing method thereof. The digital amplifier system includes a PWM conversion unit to convert a plurality of audio signals on a plurality of channels into low... Agent: Stanzione & Kim, LLP

20070170984 - Systems and methods for improving performance in a digital amplifier by adding an ultrasonic signal to an input audio signal: Systems and methods in which an ultrasonic signal is introduced into an audio signal before the audio signal is amplified by a switching amplifier. The added ultrasonic signal (e.g., a tone at half the amplifier's switching frequency) shifts the signals input to a set of power switches so that they... Agent: Law Offices Of Mark L. Berrier

20070170981 - Notch filter for ripple reduction in chopper stabilized amplifiers: A chopper-stabilized amplifier receiving an input signal includes a first operational transconductance amplifier having an input chopper and an output chopper for chopping an output signal produced by the first operational transconductance amplifier. A switched capacitor notch filter filters the chopped output signal by operating synchronously with the chopping frequency... Agent: Texas Instruments Incorporated

20070170985 - Contactless ic card system: In a contactless IC card system, a modulating circuit manufactured in an IC form is operable at a high power efficiency. The demodulating apparatus is configured to include: first signal output means for outputting a first output signal having a predetermined phase with respect to that of an input signal,... Agent: Bell, Boyd & Lloyd, LLP

20070170986 - Low-consumption voltage regulator: A voltage regulator having an input voltage and adapted to supply a regulated output voltage, the regulator including an AB class amplifier and a power transistor having a non-drivable terminal coupled to the input voltage, a non-drivable terminal coupled to a reference voltage and a drivable terminal coupled to the... Agent: Seed Intellectual Property Law Group PLLC

20070170987 - Differential-to-single-ended converter and phase-locked loop circuit having the same: In a differential-to-single-ended (D2S) converter having reduced power consumption and excellent duty ratio characteristics, and a phase-locked loop (PLL) circuit having the same, the D2S converter includes a differential amplifier and a latch circuit. The differential amplifier amplifies a differential input signal to generate a differential output signal. The latch... Agent: Mills & Onello LLP

20070170988 - Automatic power output control circuit: This invention includes a gain control section 13 capable of changing an APC loop gain according to a power output level set in a power amplifier to allow suppression of variation in power output level when the power output level is low and suppression of occurrence of ringing when the... Agent: Connolly Bove Lodge & Hutz LLP

20070170989 - Analog amplitude detector: A circuit includes at least two transistors arranged to form a current mirror, at least two transistors operatively coupled to the current mirror, where the transistors are arranged to form a differential pair amplifier, and a follower transistor operatively coupled to the current mirror and to the differential pair. The... Agent: Brake Hughes Bellermann LLP

20070170990 - Amplifier circuit with output delay selectively changed according to common mode voltage level, associated replica delay circuit and internal clock generator: An amplifier circuit having an output delay that is selectively changed in accordance with a common mode voltage level. A replica delay circuit adapted for use within an internal clock generator include such an amplifier circuit. The amplifier circuit includes a first amplifier generating internal signal in response to input... Agent: Volentine Francos, P.l.l.c.

20070170992 - Apparatus and method to eliminate noise in portable recorder: A noise removing apparatus and method usable in a portable recorder to remove noise and enhance a voice signal when the voice signal with noise is input to the portable recorder. The noise removing method includes dividing an input signal into a high frequency component signal and a low frequency... Agent: Stanzione & Kim, LLP

20070170991 - Variable gain circuit: Low distortion is implemented even in a high input level, and a smooth change in gain is maintained. A first amplifier (10) with high gain and low noise that can be gain-controlled by a first gain control signal, and a second amplifier (20) with low gain and low distortion that... Agent: Stevens, Davis, Miller & Mosher, LLP

20070170993 - Differential amplifier having an improved slew rate: A differential amplifier receives a differential input signal and generates an output signal at an output node. An auxiliary circuit coupled to the differential amplifier operates to improve slew rate response. In quiescent and small signal situations with respect to the differential input signal, the auxiliary circuit does not alter... Agent: Stmicroelectronics, Inc.

20070164815 - Power amplifier circuit reducing electromagnetic interference: A power amplifier circuit including a power transistor unit generating an output signal based on a predetermined pulse-width modulated signal. The power transistor unit includes a plurality of transistors and a delay circuit unit. The delay circuit unit sequentially drives the plurality of transistors with a predetermined time delay based... Agent: F. Chau & Associates, LLC

20070164814 - Digital amplifier: Recently, the use of class-D audio amplifiers has become more and more widespread. In contrast to the generally employed class-AB linear amplification technology, class-D allows for improved efficiency. However, the class-D principle is known for its poor distortion characteristics. According to the present invention a digital amplifier (18) is provided... Agent: Philips Intellectual Property & Standards

20070164816 - Balanced amplifier: A balanced amplifier is disclosed as comprising an input stage connected with a second stage, in which the input stage outputs signals to the second stage, and the first stage includes a first differential amplifier for receiving balanced input signals and is provided with two pairs of feedback loops, at... Agent: Ostrolenk Faber Gerb & Soffen

20070164817 - Ultrasound imaging or other use variable input impedance preamplifier: A preamplifier has a variable input impedance. The input impedance is tailored with the signal level to maintain a more optimal performance. The input impedance is varied by at least two amplifiers connected in parallel. Each amplifier has a different input impedance. By controlling the bias currents to the amplifiers,... Agent: Siemens Corporation Intellectual Property Department

20070164819 - Amplifier: With an amplifier configured by including Doherty-type amplifier sections 21 to 25, the area of the circuits is reduced so that the size reduction is achieved. Moreover, the properties of the Doherty-type amplifier sections (Doherty properties) are stabilized against any environmental change of humidity and temperature. As an example, the... Agent: Wenderoth, Lind & Ponack, L.L.P.

20070164818 - High efficiency amplifier: A high efficiency amplifier has an analog predistortion circuit (5) connected between an input side dividing circuit (2) and a quarter-wave line (6). This offers an advantage of being able to improve the linearity of the entire amplifier because the nonlinear distortion of a peak amplifier (7) is compensated.... Agent: Birch Stewart Kolasch & Birch

20070164820 - Method and system for low noise amplifier (lna) gain adjustment through narrowband received signal strength indicator (nrssi): Methods and systems for processing a plurality of signals are disclosed herein. Aspects of the method may comprise amplifying an input signal. The amplified input signal may be bandpass filtered. Amplification of the input signal may be adjusted based on only narrowband received signal strength indication of the bandpass filtered... Agent: Mcandrews Held & Malloy, Ltd

20070164821 - Load-invariant amplifier: A push-pull amplifier having low output impedance and low crossover distortion is provided. A least one of a current through a sourcing current path of an output stage and a current through a sinking current path of the output stage is determinative of a quiescent current control signal produced for... Agent: Albihns Stockholm Ab

20070164822 - Phase compensation for analog gain switching in ofdm modulated physical channel: A control of an amplifier in an automatic gain control (AGC) loop, e.g. in the RF front end circuitry of an OFDM receiver, provides phase adjustment control data to an associated automatic frequency control (AFC), to compensate for a phase jump that would otherwise be caused by switching of the... Agent: Qualcomm Incorporated

20070164823 - Automatic gain control apparatus: An automatic gain control apparatus receiving an analog signal and outputting a digital signal includes a variable gain amplifier, an A/D converter, and a feedback circuit. The variable gain amplifier amplifies the analog signal with a gain. The A/D converter converts the amplified analog signal to the digital signal. The... Agent: Rothwell, Figg, Ernst & Manbeck, P.C.

20070164824 - Amplifier: The present invention provides means for compensating a multi-stage amplifier having a gain extension characteristic for distortions. The present invention also provides an approach for using an amplification stage biased in a state close to B-class, which exhibits a high power added efficiency at low output, in order to have... Agent: Sughrue Mion, PLLC

20070164825 - Reduced-size sensor circuit: The present invention relates to circuits configured for implementation in sensors, sensors employing such circuits, and methods of operating and manufacturing such sensors and/or circuits. In at least some embodiments, the circuit includes a capacitor having a first input terminal and a first output terminal, a first amplifier having second... Agent: Rockwell Automation, Inc. / Whd Attention: Susan M. Donahue

20070164826 - Gain controllable low noise amplifier and wireless communication receiver having the same: A gain controllable wide-band low noise amplifier includes a first transistor coupled to an input node and an output node and amplifying an input signal to generate an output signal, a second transistor allowing the output signal to feedback to the input node, and a control circuit complementarily controlling transconductance... Agent: F. Chau & Associates, LLC

20070159243 - Circuit and method for amplification of an electrical input signal: In a circuit and a method for amplification of an electrical input signal, a signal splitter divides the input signal into a first partial signal in a first signal path and a second partial signal in a second signal path. The first signal path has a first amplification stage for... Agent: Schiff Hardin LLP Patent Department

20070159244 - Gain control methods and systems in an amplifier assembly: A Variable Gain Amplifier (VGA) amplifies an input signal according to a gain, to produce an amplified signal. A detector module detects a power indicative of a power of the amplified signal. A comparator module compares the detected power to a high threshold, a low threshold and a target threshold... Agent: Sterne, Kessler, Goldstein & Fox P.l.l.c.

20070159245 - Apparatus for calibrating non-linearity of radio frequency power amplifier: An apparatus for calibrating the non-linearity of an RF power amplifier is provided. In an amplification apparatus for the RF power amplifier, a main amplification portion up converts an input baseband digital signal to a time variant input analog signal, and amplifies the input analog signal to a power level.... Agent: The Farrell Law Firm, P.C.

20070159246 - Power amplifier: A power amplifier includes: an active device having at least one heterojunction bipolar transistor based on a compound semiconductor; a diode connected between the base and the emitter of the bipolar transistor in reverse direction with respect to the base-emitter diode; a resistor connected in series between the diode and... Agent: Oblon, Spivak, Mcclelland, Maier & Neustadt, P.C.

20070159247 - Cmos amplifier of filter for ultra wideband application and method of the same: A CMOS amplifier of a filter for an ultra wideband application and a method of the same are provided. In the CMOS amplifier, an active load circuit adds a Zero location and increases a gain by MOSFETs, feeding back operation, and has a property of a high gain and a... Agent: Sughrue Mion, PLLC

20070159248 - Differential amplifier, data driver and display device: A differential amplifying circuit capable of reducing amplitude-difference deviation over a full range of grayscale voltages inclusive of voltages in the vicinity of power-supply voltage includes first and second differential pairs of mutually different polarities, in which the outputs of the differential pairs are coupled by a coupling stage. One... Agent: Mcginn Intellectual Property Law Group, PLLC

20070159250 - Differential amplifier, data driver and display device: A differential amplifying circuit that includes a differential pair and a cascode current mirror circuit that forms the load circuit of this differential pair. The cascode current mirror circuit includes a control-terminal-coupled first transistor pair, and second and third transistor pairs that receive first and second bias signals at coupled... Agent: Mcginn Intellectual Property Law Group, PLLC

20070159249 - Differential amplifier and display device using the same: Disclosed is a differential amplifier which comprises a differential pair comprising depletion-type first and second N-channel MOS transistors, a first current source that supplies a current for the differential pair, a current mirror circuit formed by transistor pairs connected in cascode fashion in two stages, for connecting an output pair... Agent: Mcginn Intellectual Property Law Group, PLLC

20070159252 - Low voltage input stage: A transconductance input apparatus energized by supply voltage has an input for receiving an input signal, and an output for delivering an output signal. The apparatus also has a plurality of transconductance stages for converting the input signal into the output signal, which is substantially free of dead zones when... Agent: Bromberg & Sunstein LLP

20070159251 - Variable gain amplifier and differential amplifier: Variable gain amplifier includes signal amplifying transistor, and gain control transistors at output and non-output sides. Emitters or sources of gain control transistors at output and non-output sides are connected to collector or drain of signal amplifying transistor. Output load is connected between collector or drain of gain control transistor... Agent: Baker & Mckenzie LLP Patent Department

20070159253 - Apparatus and method for reducing flicker noise of cmos amplifier: An apparatus and method of reducing a flicker noise of a CMOS amplifier is provided. In the CMOS amplifier, a load circuit is connected to a signal input circuit which includes two pairs of MOSFETs which simultaneously receive differential signals. In this instance, a first MOSFET included in a switch-bias... Agent: Sughrue Mion, PLLC

20070159254 - Power amplifier circuit and test apparatus: There is provided a power amplifier circuit that applies an output voltage according to a given input voltage to a load, the power amplifier circuit includes an amplifying section of which an output port is connected to the load and that outputs the output voltage according to the input voltage,... Agent: Osha Liang L.L.P.

20070159255 - High output current buffer: A bipolar high output current buffer is disclosed using a negative feedback current mirror to supply the base drive to an output transistor. Small quiescent currents are used wherein the buffer demonstrates low quiescent power dissipation. The current mirror supplies the incremental base drive to the output transistor to support... Agent: Cesari And Mckenna, LLP

20070159256 - Timing controller and timing control method: A timing controller is disclosed that includes: an amplifier part configured to amplify a first input signal in accordance with a control voltage, the first input signal being one of a transmission signal and a signal of a fixed value; a detector part configured to detect envelope information from the... Agent: Bingham Mccutchen LLP

20070159257 - 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.

20070159258 - Radiofrequency (rf) and/or microwave power amplification device and corresponding radiocommunication terminal: The disclosure relates to a radio frequency (RF) and/or microwave power amplification device which is intended, for example, for a radio communication terminal, comprising means for shielding the device and means for controlling the power delivered as output from said device, said power-control means comprising a power servo loop having... Agent: Westman Champlin & Kelly, P.A.

20070152747 - Multiplexed amplifier: Multiple sensor signals are used to modulate an equal number of frequency-spaced carrier signals in a directional parametric upconverting amplifier. Basically, the carrier signals are separated in a cascaded or parallel configuration of narrow frequency passbands, which also modulate the carrier signals with low-frequency sensor signals. The modulated carrier signals... Agent: Tarolli, Sundheim, Covell & Tummino L.L.P.

20070152748 - Power amplifier with low power distortion at output: A digital/analog amplifier includes the following coupled in series: a pulse-width modulator, a control circuit, a power inverter and a filter. The power inverter comprises two transistors series-connected between a power supply terminal and a ground of the amplifier. The control circuit drives the transistors of the power inverter. One... Agent: Allen, Dyer, Doppelt, Milbrath & Gilchrist P.A.

20070152749 - Transmission circuit and related method: A transmission circuit and related method are disclosed. A transmitter in the transmission circuit has CMOS transistors as driving units for responding an input signal to drive an output signal at an output node, and each driving unit has a corresponding charge unit formed by a capacitor-connected MOS of a... Agent: North America Intellectual Property Corporation

20070152750 - Digital pwm amplifier with simulation-based feedback: Systems and methods for performance improvements in digital switching amplifiers using simulation-based feedback. In one embodiment, a digital pulse width modulation (PWM) amplifier includes a signal processing plant configured to receive and process an input audio signal. The amplifier also includes a simulator configured to model processing of audio signals... Agent: Law Offices Of Mark L. Berrier

20070152751 - Wide bandwidth, high power amplifier: A wide bandwidth, high power amplifier system for amplifying a signal in a radio frequency (RF) system in a specific bandwidth within the frequency range from 1 MHz to 100 GHz. The system includes a number of amplifier modules and an equal number of input transformers connected in series, with... Agent: Trex Enterprises Corp.

20070152752 - Bias circuit: A bias circuit of a resistance load differential amplifier comprises a first differential pair and a control unit for controlling a tail current of the first differential pair, and making an output current of the first differential pair being in inverse proportion to a load resistance in the resistance load... Agent: Arent Fox PLLC

20070152753 - System and method for clamping a differential amplifier: System and method for limiting an output signal of a differential amplifier. A preferred embodiment comprises a limit sense amplifier configured to detect when the output exceeds a permitted limit, a common mode bias current unit configured to increase a signal gain of a common mode amplifier in the differential... Agent: Texas Instruments Incorporated

20070152754 - Method of fabricating phase change ram including a fullerene layer: A method of fabricating a phase change RAM (PRAM) having a fullerene layer is provided. The method of fabricating the PRAM may include forming a bottom electrode, forming an interlayer dielectric film covering the bottom electrode, and forming a bottom electrode contact hole exposing a portion of the bottom electrode... Agent: Harness, Dickey & Pierce, P.L.C

20070152755 - Regulated power supply unit: An improved power supply unit includes a DC power source having a positive terminal and a negative terminal, and a voltage regulating circuit that includes a plurality of elements coupled in series between the positive and negative terminals of the DC power source to regulate the power supply signals supplied... Agent: Gordon & Jacobson, P.C.

20070152756 - Transimpedance amplifier using negative impedance compensation: A transimpedance amplifier (TIA) with negative impedance compensation is disclosed, which comprises a TIA element and a negative impedance compensator connected to the output terminal of the TIA element. There are various designs capable of implementing the negative impedance compensator. The major components of the negative impedance compensator are a... Agent: Lin & Associates Intellectual Property