Amplifiers inventions 08/06

20060192615 - Amplifier with high output power dynamic: The invention concerns an amplifier comprising a specific number of N active elements (11 to 1N) coupled in parallel to a load impedance (2) via an adaptive device (3) including at least a specific number of N referenced susceptance compensating circuits (41 to 41N)> The susceptance compensating circuits (41 to...

20060192616 - Electronics parts for high frequency power amplifier: This invention provides an electronic part for high frequency power amplification (RF power module) which will automatically perform the precharge level setting for proper output power at start of transmission without requiring the software process for precharging to run on the baseband IC, which can reduce the burden on users,...

20060192617 - Low noise ac coupled amplifier with low band-pass corner and low power: A low noise AC coupled amplifier having transistors sharing bias currents, and having a low band-pass corner frequency and consuming low power. The amplifier may be used in a magneto-resistive (MR) preamplifier to amplify a response from a MR sensor. Bipolar and MOS transistors are used in the front end,...

20060192618 - Programmable gain amplifier and method: One embodiment of the present invention may include a programmable gain amplifier comprising an input multiplexer operative to sequentially select input signals for amplification. The input signals may be chosen from a plurality of input signals based on a selection signal. The programmable gain amplifier may include at least one...

20060192619 - Procedure for operating a high frequency amplifier: A procedure for operation of a high frequency amplifier having a power transistor—amplifier stage designed as a source or emitter circuit for amplifying a gate or base side high frequency signal supplied over an input interface network E which signal is amplified at the drain or collector side and output...

20060186954 - Amplifier arrangement, and method for compensating for an offset: An amplifier arrangement and a method for compensating for an offset in an amplifier is provided. A respective switch for connecting together the inputs in a compensation operating mode and for interrupting the feedback path in this operating mode is provided in an amplifier. A control device detects an output...

20060186953 - Circuit and method for compensating for offset voltage: A circuit for compensating for an offset voltage in a PhotoDetector Integrated Circuit (PDIC). The circuit includes a temperature detection unit, a current transfer unit and a current adjustment unit. The temperature detection unit generates a current that varies with variation in surrounding temperature. The current transfer unit transfers the...

20060186955 - Multi-channel, multi-power class d amplifier with regulated power supply: Methods and apparatus are disclosed to reduce the size, weight, and heat loss of power modules mountable in loudspeakers. Disclosed embodiments replace conventional linear technology with high frequency switching technology in both the power supply and amplifier. In these embodiments Class-D switching occurs at a low and fixed frequency, using...

20060186956 - High output power amplifier with adjustable voltage transformation ratio of transformer: A high output power amplifier with change of voltage transformation ratio of a transformer is disclosed. The high output power amplifier using a transformer installed to output leads thereof, which can increase dynamic range and efficiency thereof as voltage transformation ratio of the transformer is adjusted and load resistance is...

20060186957 - Noise generator: A device for generating a noise signal, which may be used for generating a truly random sequence (10) of bits is disclosed. The device comprises a noise source (11), and an amplifier (12) connected to the noise source (11). The device according noise source according to the invention is protected...

20060186958 - High efficiency linear amplifier: A linear amplifier is configured with a current-feedback amplifier followed by a voltage-feedback amplifier to drive a totem-pole output stage. The output stage includes a series arrangement of an npn transistor and a pnp transistor with their emitters coupled in series and to an output node. The voltage amplifier driving...

20060186959 - Low-consumption voltage amplifier: A low consumption voltage amplifier including a transistor, a first current generator that supplies power to the drain of the transistor, a second current generator that charges the source of the transistor, the current output by the second current generator being substantially equal to the value of the current output...

20060186960 - Use of analog-valued floating-gate transistors for parallel and serial signal processing: Analog-valued floating-gate transistors are used as trimmable circuit components for modifying and/or controlling the gain, phase, offset, frequency response, current consumption, and/or transfer function of signal pathways in parallel and/or serial processing circuits in radio frequency, analog, or mixed-signal integrated circuits....

20060186961 - Variable gain differential amplifier, and variable degeneration impedance control device and method for use in the same: Disclosed are a variable gain differential amplifier, and variable degeneration impedance control device and method for use in the variable gain differential amplifier, which can adjust an amplification gain and ensure linearity. A DC level of a differential signal to be amplified by the amplifier is adjusted according to a...

20060186962 - Bias circuit with mode control and compensation for voltage and temperature: An amplifier bias system. The amplifier bias system includes a battery voltage supply coupled with an amplifier transistor to be biased; an output node coupled with a gate of the amplifier transistor; and a current source coupled with the battery voltage supply, wherein the current source provides a current to...

20060186963 - Active lc filtering damping circuit with galvanic isolation: Active damping of voltage across a LC output filter includes providing a feedback signal from a feedback circuit in relation to operation substantially at a resonant frequency of the LC circuit....

20060186964 - Output power detection circuit: A detection circuit for detecting the output power of a power amplifier comprises a first current minor transistor (Ti 1) having a base, which is connectable to a power transistor (T10), and a collector, a RF detection means (RF-det) for detecting the RF current flowing through the current mirror transistor...

20060186965 - Differential to single-ended converter: A converter is for a differential input signal into a single-ended output signal and may include a differential pair of identical first and second transistors driven by the differential input signal, and a circuit for filtering DC components, connected between the current terminal of the second transistor not in common...

20060186966 - Negative gain transductance amplifier circuit: c

20060181340 - Regulating charge pump: A regulating charge pump includes a variable-configuration charge pump in combination with a linear regulator, the charge pump arranged within the linear regulator feedback loop to accurately control the charge pump output current or voltage. A charge pump of voltage gain N is utilized to advantageously reduce headroom required in...

20060181342 - Digital amplifier: Switching circuits constituted by FETs are inserted between power supplies +VB and −VB and a speaker serving as a load respectively, and switched on/off by a pulse train so as to drive the speaker. A pulse generation circuit is a circuit by which a pulse train subjected to pulse width...

20060181341 - Pwm digital amplifier with high-order loop filter: An improved PWM amplifier is disclosed that uses multiple integrators in the loop filter to provide high loop gain across the frequency band-of-interest. The frequency characteristics of the loop filter are optimized to distribute large loop gains across the entire band to provide large suppression of noise and distortions generated...

20060181343 - 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...

20060181344 - Multiple signal intermodulation reduction system: An intermodulation product reduction or cancellation amplifier received two input signals that are split in quadrature wherein the inphase outputs are summed and then amplified as an inphase signal, and the quadrature outputs are fixed-phase phase-shifted, then summed and then amplified as a quadrature signal. The inphase and quadrature signals...

20060181345 - Adaptive predistortion for a transmit system: Systems, methods, and devices relating to the provision of deliberate predistortion to an input signal to compensate for distortions introduced by an amplifier subsystem. An input signal is received by a signal processing system which includes a predistortion subsystem. The input signal is decomposed and the fragments are then predistorted...

20060181346 - Constant frequency self-oscillating amplifier: A self-oscillating switch-mode amplifier amplifying an input signal into a power output signal comprising an integrator for integrating the difference between the input signal and the output signal and a hysteretic comparator with thresholds which are modulated according to absolute value of the input signal. When the thresholds are quadratic...

20060181347 - Delay circuit and method therefor: In one embodiment, a delay circuit is formed to use cascode coupled transistors to receive signals from a differential pair and increase the propagation through the delay circuit....

20060181349 - Cmos variable gain amplifier for controlling db linear gain: Provided is a complementary metal oxide semiconductor variable gain amplifier controlling a dB linear gain and a method of controlling the dB linear gain. The complimentary metal oxide semiconductor variable gain amplifier includes: first through fourth transistors differentially receiving first and second input voltages and amplifying the first and second...

20060181348 - Peaking transmission line receiver for logic signals: A receiver circuit is configured as a frequency compensated differential amplifier having one input coupled to the output of a transmission line to receive a transmitted signal and the second input coupled to a reference voltage. The differential amplifier has a high frequency gain equivalent to the gain of an...

20060181350 - Slew rate enhancement circuitry for folded cascode amplifier: A folded-cascode operational amplifier including a differential input stage (19) and a class AB output stage (20) includes a first slew boost current mirror (13) and a second slew boost current mirror (14) having inputs connected to drains of the input transistors, respectively. Each current mirror amplifies excess tail current...

20060181351 - Power control circuit for accurate control of power amplifier output power: According to an exemplary embodiment, an amplification module includes a power control circuit. The amplification module further includes a power amplifier coupled to the power control circuit and configured to draw a supply current and receive a supply voltage from the power control circuit. The power control circuit is configured...

20060181352 - Radio frequency excitation arrangement: A method is performed for influencing the signal shape of an output signal of an RF power resonance amplifier and an RF excitation arrangement including an RF power resonance amplifier. A basic signal of a basic frequency is amplified and modulated with a modulation signal, and an output oscillating circuit...

20060176107 - Amplifier, voltage stabilizing unit and method thereof: An amplifier, a voltage stabilizing unit and a method thereof. In the method, a determination may be made as to whether there is a current fluctuation in a signal, for example where the signal is a current output by at least one input unit. If the current fluctuation is detected,...

20060176109 - Chopper chopper-stabilized instrumentation and operational amplifiers: Chopper chopper-stabilized instrumentation and operational amplifiers having ultra low offset. The instrumentation amplifiers use current-feedback, and include, in addition to a main chopper amplifier chain, a chopper stabilized loop for correcting for the offset of the input amplifiers for the input signal and for receiving the feedback of the output...

20060176108 - Frequency stabilization of chopper-stabilized amplifiers: Frequency stabilization of chopper-stabilized amplifiers using multipath hybrid double-nested Miller compensation. The compensation may provide a desired 6 dB/oct roll off for both instrumentation amplifiers and operational amplifiers. Various embodiments are disclosed....

20060176110 - Gain control amplifier: A gain control amplifier is provided including: a non-inverting amplifier receiving an input voltage and a direct current reference voltage, and non-inverting amplifying and outputting an alternating component of the input voltage using a predetermined voltage gain based on the direct current reference voltage; and an offset compensator removing a...

20060176111 - Electronic device comprising audio mute control circuit: To provide an electronic device comprising an audio mute control circuit for preventing the occurrence of a “click noise” even in “power supply shutdown” not caused by the input of a power switch. An audio mute control circuit 70 is provided which outputs a mute signal to an audio processing...

20060176112 - Variable gain amplifying apparatus and wireless communication apparatus: A variable gain amplifying apparatus has an amplifier, one or more first switching elements connected in parallel to the amplifier, and a phase shifter connected in series to the first switching element. The first switching element is enabled if the level of an input signal or an output signal is...

20060176113 - Feed forward amplifier employing positive feedback pilot generation with automatic level control: A feed forward amplifier and method of amplification are disclosed. The amplifier output is used to generate a pilot signal via feedback using uncancelled noise in the amplifier output. An automatic level control circuit maintains the pilot signal at a substantially constant level when the detected uncancelled noise in the...

20060176114 - Broadband microwave amplifier: A Class-E load circuit topology suitable for switching mode Power Amplifiers (PAs). The inventive load includes a shunt inductive element coupled to an output of said amplifier; a series inductive element coupled to said output of said amplifier; and a series capacitive element coupled to said series inductive element. In...

20060176115 - Operational amplifier circuit: To provide a differential operational amplifier circuit that attains a wide-band and high-DC-gain characteristic and operates with a low power supply voltage. A signal path having three amplifier circuits passing an Nch transistor pair, cascode connected Nch transistor pairs, and a Pch transistor pair functions as a gain path having...

20060176116 - Distributed amplifier topologies with improved gain bandwidth product: A distributed amplifier is provided that includes an input network that simulates an input signal transmission line, and having an output network that simulates an output signal transmission line, and also having multiple unit cells with amplifying characteristics that are connected in parallel to one another between the input network...

20060176117 - Semiconductor integrated circuit apparatus: A capacitor 12 is formed by laminating a lower electrode 12b, a dielectric 12e and an upper electrode 12t in this order. An inductor 14 is formed as a thin metal wiring of a spiral shape so as to have an inductor component. The inductor 14 is formed in the...

20060170491 - Optoelectronic sensor: Disclosed is an optoelectronic sensor comprising at least one photodiode (1) which can be connected to a first potential (Vreset,Vreset1) via a first transistor (T1) or a first diode (D1). Said photodiode (1) can also be connected to the input of a readout amplifier (T3) via a second transistor (T2)....

20060170492 - Dual-band power amplifier: The present invention discloses a dual-band power amplifier, capable of operating at a first frequency and a different second frequency simultaneously. The dual-band power amplifier comprises a first gain stage; a second power stage; an input matching unit electrically connected between the first gain stage and a signal input port;...

20060170493 - Method for setting an output voltage of a receiving circuit of a receiving head of a rail contact and rail contact system: A method is proposed for setting an output voltage of a receiving circuit (5) of a receiving head (4) of a rail contact and a rail contact system for executing the method, at least one receiving voltage tapped from the receiving head (4) of the rail contact being superposed by...

20060170494 - Cross-talk reduction circuit and method therefor: In one embodiment, a pair of differential amplifiers have outputs coupled together. A signal received on one input results in signals coupled to the outputs that substantially cancel each other at the outputs....

20060170497 - Gain variable amplifier: A gain variable amplifier according to an embodiment of the present invention includes: an amplifier circuit amplifying an input signal with a variable gain; and a gain control circuit controlling the gain of the amplifier circuit based on a gain control signal, in which the amplifier circuit includes: an amplifying...

20060170496 - Signal processing circuit and communication device using the same: A signal processing circuit having a modulator (10B) having frequency conversion circuits (15, 16) each having a local oscillator and mixer, multiplying a signal having a first frequency and a local oscillation signal from the local oscillator at the mixer to convert the frequency of the first frequency signal to...

20060170495 - Variable gain amplifier: A high frequency amplifier arrangement comprises a first stage with a modulator receiving a baseband signal, and a controllable current shunting device coupled with the modulator; a second stage coupled with the first stage comprising a gain controllable emitter follower; a third stage comprising a gain controllable amplifier coupled with...

20060170498 - Class ab operational buffer: A class AB operational buffer comprises an output stage, a voltage supply circuit to provide a first voltage and a second voltage to drive the output stage, a first current source to provide a first current, a second current source to provide a second current, a first current mirror having...

20060170499 - Closed loop power control with high dynamic range: A method (500) and apparatus (300, 400, 601) facilitate closed loop transmit power control in a power control loop at and during a transition from one transmit power level to another transmit power level in a transmitter. The apparatus includes a reference path (326) configured to provide a reference signal...

20060170500 - Variable inductor, oscillator including the variable inductor and radio terminal comprising this oscillator, and amplifier including the variable inductor and radio terminal comprising this amplifier: An amplifier comprises an amplifier circuit which comprises a first inductor as an impedance element for degeneration, and a control circuit which has a second inductor electro-magnetically connected to the first inductor, and changes a control current flowing through the second inductor to change an inductance value of the first...

20060170501 - Gain stage control method and related control circuit: A gain stage control method may include providing a control current signal; generating a regulation current signal connected to the control current signal; transforming the regulation current signal into a biasing current, proportional to the regulation current signal; and biasing the gain stage by using the biasing current. The biasing...

20060170502 - Low noise amplifier for ultra wide band: A low noise amplifier (LNA) for ultra wide band recives 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...

20060170503 - Small-sized on-chip cmos power amplifier having improved efficiency: A small-sized on-chip complementary metal-oxide semiconductor (CMOS) Power Amplifier having improved efficiency is provided herein. The on-chip CMOS power amplifier is capable of improving efficiency and maximizing output thereof by enhancing a K factor, which may cause a problem in a power amplifier having a distributed active transformer structure. The...

20060170504 - Photodiode integrated circuit having multiple gain states: Disclosed herein is a PhotoDiode Integrated Circuit (PDIC) having multiple gain states. The PDIC includes a current-voltage conversion unit, an input amplification stage circuit, a reference resistance unit, a feedback resistance unit, and a switching unit. The current-voltage conversion unit converts a current signal into a voltage signal. The input...