Amplifiers inventions 02/06

20060038612 - Power amplifier and radio communication device using the amplifier: A power amplifier includes amplifier elements to amplify input signals of different frequencies. The amplifier also includes a power supply circuit that includes a common power supply path including an end connected to a power supply input terminal connected to a DC power supply. The amplifier further includes individual power...

20060038613 - Power amplifier and radio communication device using the amplifier: A power amplifier includes amplifier elements to amplify input signals of different frequencies. The amplifier also includes a power supply circuit that includes a common power supply path including an end connected to a power supply input terminal connected to a DC power supply. The amplifier further includes individual power...

20060038614 - Programmable gain instrumentation amplifier with improved gain multiplexers: In one embodiment, a programmable gain instrumentation amplifier comprises an input stage configured with a differential precision current conveyor circuit. The current conveyor circuit may be implemented with operational amplifiers coupled to gain-setting resistors, with double-multiplexers configured on each end of the gain-setting resistors. In a first set of embodiments,...

20060038615 - Differential structure programmable gain instrumentation amplifier: In one embodiment, a programmable gain instrumentation amplifier (PGIA) comprises a pair of current conveyors, each current conveyor having a respective sense node and a respective voltage input, with a gain-setting resistor coupled between the respective sense nodes, and current being sensed on both sides of the gain setting resistor....

20060038616 - Apparatus and method for controlling operation of an amplifier device when supply voltage varies: An apparatus for controlling operation of an amplifier device when supply voltage provided to the amplifier device varies at an input voltage supply locus. The amplifier device has an operating parameter varying in generally direct proportion with the supply voltage. The apparatus includes: (a) a reference parameter supply providing a...

20060038617 - Continuously variable gain radio frequency driver amplifier having linear in decibel gain control characteristics: A radio frequency (RF) driver amplifier system and method that provides linear in decibel gain control is provided. The RF driver amplifier system comprises a linear transconductor receiving an input voltage and providing a controlled current based on input voltage received, temperature compensation circuitry for varying current from the linear...

20060038618 - Precision current mirror and method for voltage to current conversion in low voltage applications: A voltage-to-current conversion circuit includes an error amplifier (12A) which amplifies a voltage difference between the drains of the first (6) and second (7) transistors of a first current mirror, wherein drain current of the first transistor is proportional to an input voltage (Vin). The output of the error amplifier...

20060038619 - Differential amplifier circuit, operational amplifier circuit, light-receiving amplifier circuit using the same, function selection circuit, and light-receiving circuit using the same: A differential amplifier circuit, an operational amplifier circuit, and a light-receiving amplifier circuit using the same are provided, by which the influence of an on resistance of an analog switch is reduced during the switching of gain resistances. An NPN transistor Q2 having an emitted connected in common is connected...

20060033561 - Reducing noise and/or power consumption in a switched capacitor amplifier sampling a reference voltage: An aspect of the present invention ensures that (substantially) equal common mode voltage is present at the input terminals of an operational amplifier (amplifying the residue signal in a stage of an ADC in two phases) while reducing the noise introduced into the amplified signal. Such a features is obtained...

20060033562 - Mosfet amplifier having feedback controlled transconductance: A signal is applied to the body of a MOSFET to enhance the transconductance of the MOSFET. The signal applied to the body of the MOSFET has essentially the same waveform as an input signal supplied to the gate of the MOSFET, and is shifted by approximately 180 degrees with...

20060033563 - Power amplifier and radio communication device using the amplifier: A power amplifier includes amplifier elements to amplify input signals of different frequencies. The amplifier also includes a power supply circuit that includes a common power supply path including an end connected to a power supply input terminal connected to a DC power supply. The amplifier further includes individual power...

20060033564 - Power amplifier and radio communication device using the amplifier: A power amplifier includes amplifier elements to amplify input signals of different frequencies. The amplifier also includes a power supply circuit that includes a common power supply path including an end connected to a power supply input terminal connected to a DC power supply. The amplifier further includes individual power...

20060033565 - Power amplifier and radio communication device using the amplifier: A power amplifier includes amplifier elements to amplify input signals of different frequencies. The amplifier also includes a power supply circuit that includes a common power supply path including an end connected to a power supply input terminal connected to a DC power supply. The amplifier further includes individual power...

20060033566 - Power amplifier and radio communication device using the amplifier: A power amplifier includes amplifier elements to amplify input signals of different frequencies. The amplifier also includes a power supply circuit that includes a common power supply path including an end connected to a power supply input terminal connected to a DC power supply. The amplifier further includes individual power...

20060033569 - Method and apparatus for performing digital pre-distortion: A pre-distorter that compensates for amplitude and phase distortion created by an amplifier. During a training session, the amplifier is stimulated with input signals of pre-selected amplitude and phase at various temperatures and the amplifier output is captured and converted into data sets. Polynomials are then fitted to the data...

20060033567 - Predistortion control apparatus: A digital predistorter comprises a module J for producing a counteracting signal Vm1 for combination with the input signal of a power amplifier to correct the output of the amplifier for distorting memory effects within the amplifier. The module J produces the contracting signal Vm1 by convolving (see FIG. 6)...

20060033568 - Predistortion linearizing: A method for a predistortion linearization of a branched signal for a RF amplifier, comprising supplying a branched signal to at least one input terminal (2); distributing power of the input signal present on at least one input terminal (2) to a plurality of parallel branch-circuits (16, 18, 20) as...

20060033570 - Differential amplifier: The input stage of an operational amplifier includes at least four signal-receiving stages adapted to receive four input signals. If the voltage level associated with any of the input signal changes, at least one transistor in each of the at least four signal-receiving stages conducts more current and at least...

20060033571 - Differential gain stage for low voltage supply: A new method and a circuit to improve the low voltage performance of a differential gain stage is achieved. The method comprises a monitoring stage and a differential stage. The monitoring stage comprises a differential transistor pair having first and second differential inputs, an upper current input, and a lower...

20060033572 - Method and circuit for trimming a current source in a package: A method and circuit for trimming a current source packaged with a device can facilitate trimming of the current source without the need for additional pins or dual function pins, resulting in improved accuracy and/or simplified trimming techniques. An exemplary packaged device is configured with a trimming circuit comprising a...

20060033573 - Amplifying circuit: The present invention provides an amplifying circuit capable of accomplishing high-impedance input/output, and providing a high gain and low power consumption. The amplifier amplifies a signal received through an input terminal, and outputs the signal through an output terminal. A control circuit comprised of the inductors, and the switches turns...

20060033574 - High linearity programmable gain amplifier using switch: Disclosed is a high linearity programmable gain amplifier using a switch, including an attenuating portion for controlling a gain of a signal and an amplifying portion having a first amplifying part and a second amplifying part, for amplifying an input signal and outputting a signal amplified, wherein the first amplifying...

20060033575 - Variable-gain amplifier: A variable-gain amplifier has distortion characteristics (IIP3) improved when the gain is attenuated without impairing characteristics with respect to a gain PG and a noise figure NF when the gain is maximum. The variable-gain amplifier has a plurality of parallel-connected dual-gate FETs having first FETs (6), (8) having gates for...

20060033577 - Amplifier circuit: Bases of two grounded transistors are connected with each other to form a current mirror bias circuit. A signal is inputted to the base of one of the grounded transistors. To reduce the influence of β difference between the two grounded transistors by an amplifier to which the signal is...

20060033576 - Amplifier circuit having an impedance-controllable bias-boosting circuit: An amplifier circuit (1) includes an amplifying transistor (QØ) and an impedance-controllable dc bias circuit (2) for biasing the amplifier transistor (QØ) to obtain a conduction angle of at least about 180°. The dc bias circuit (2) includes a self-bias boosting circuit having separate current sources (Ibias, Iclass) for independently...

20060033578 - Circuitry and method for accelerated switching of an amplifier: A circuitry comprises an amplifier with a bipolar transistor, whose base terminal is coupled to an input terminal for a signal to be amplified. A biasing means for setting a potential at the base terminal of the bipolar transistor is provided. Further, a means for providing such a current to...

20060033579 - Trans-conductance amplification circuit, trans-conductance filter circuit, and filtering method: A trans-conductance filter circuit with an expanded cut-off frequency range is provided. The cut-off frequency of a trans-conductance filter circuit is changed by varying the current mirror ratio of a current mirror circuit. This mirror ratio is varied by changing the output current of a constant current source, or by...

20060028268 - Method and apparatus for calibrating center frequency of power amplifier: A method and an apparatus for calibrating the center frequency of a power amplifier. The apparatus includes a capacitor unit and an inductor unit. The capacitor unit and the inductor unit are connected in parallel so as to control the center frequency of the power amplifier. The method includes: (a)...

20060028269 - Power amplifier with switchable load: Power amplifier with switchable load. A first amplifier that includes an output electrode is provided. A second amplifier that includes an output electrode is also provided. A switchable load that receives a control signal selectively presents a first impedance to the first amplifier when the first amplifier is operational, and...

20060028270 - Adaptable voltage control for a variable gain amplifier: A method and apparatus for adaptively controlling a variable gain amplifier (VGA). The operation of the VGA is separated into a low gain mode and a high gain mode and the mode in which the VGA is currently operating in is adaptively sensed. A threshold voltage is compared to a...

20060028271 - High efficiency amplification: There is disclosed a radio frequency amplification stage comprising: an amplifier for receiving an input signal to be amplified and a power supply voltage; and a power supply voltage stage for supplying said power supply voltage, comprising: means for providing a reference signal representing the envelope of the input signal;...

20060028272 - Class d amplifier: A drive signal that matches the bias of a transistor is generated. A differential amplifier calculates the difference between a specified voltage of negative power supply and another input signal. Then, a resistor that realizes a pull-down function level-shifts it towards a negative power supply voltage having a higher absolute...

20060028273 - Gain-boosted opamp with capacitor bridge connection: The number of compensation capacitors of an opamp may be reduced by connecting the compensation/decoupling capacitor element or elements between the load node and the bias node of the operational amplifier, rather than providing separate capacitive elements from each load node to ground (the reference voltage). This allows one to...

20060028274 - Differential amplifier, and data driver of display device using the same: Disclosed is a Rail-to-Rail amplifier including a plurality of differential pairs of a first conductivity type and a plurality of differential amplifiers of a second conductivity type each with one of an input pair thereof constituting an input terminal, a differential amplifier that outputs an output voltage according to the...

20060028275 - Differential amplifier having independently tunable base gain, peak gain and boost frequency, and uses of same: A waveform shaping method comprises: (a) receiving link-distorted signal pulses; (b) passing the link-distorted signal pulses through a series of differential amplifiers each have independently tunable, base gains, peak boost gains, boost frequencies and boost bandwidths; and (c) adjusting one or more of the base gains, peak boost gains, boost...

20060028276 - Cmos-configured transconductance amplifier circuit: A CMOS-implemented transconductance amplifier has an input gain stage coupled to a CMOS output stage. The inverting input of the input gain stage is coupled to an input/output port to which an input voltage is coupled. The CMOS output stage has a first, transconductance CMOS transistor pair, whose source-drain paths...

20060028277 - Power amplifier module: The present invention provides a power amplifier module featuring that: its output power characteristic smoothly changes as the input control Voltage changes; and its control sensitivity is stable over a wide dynamic range. By same means, idling current for gain setting is supplied to a single amplifier element or all...

20060028278 - Radio frequency power amplifier module: An object of the present invention is to provide a radio frequency power amplifier of multi stage amplifying method that is designed to reduce instability of output power caused by electromagnetic coupling of bias supply terminals and interconnections of each stage to thereby operate stably. Another object of the present...

20060028279 - Automatic gain control feedback amplifier: There is provided a feedback amplifier capable of easily controlling its dynamic range without a separate gain control signal generation circuit. The feedback amplifier includes an input terminal detecting an input voltage from input current, a feedback amplification unit amplifying the input voltage to generate an output signal, and an...

20060028280 - Modulation dependent biasing for efficient and high linearity power amplifiers: A power amplifier includes a transconductance stage and a modulation detection and bias determination module, and may include a cascode stage. The modulation detection and bias determination module operably couples to the transconductance stage and to the cascode stage when present and is operable to detect modulation characteristics of an...

20060022747 - Estimating the operating point on a non-linear traveling wave tube amplifier: A method, apparatus, article of manufacture, and a memory structure provide the ability to determine an input operating point and an output operating point on a non-linear traveling wave tube amplifier (TWTA). The non-linearity of the TWTA is measured. An input roots mean-square (RMS) value of an input signal used...

20060022748 - Variable gain amplifier circuit and radio machine: The bases of bipolar transistors Q1, Q3 and Q5 and the bases of bipolar transistors Q2, Q4 and Q6 are connected in common with each other, these bipolar transistors forming a plurality of common-emitter amplifier circuits, and switches SW2, SW1 and SW0 are connected to the respective sides of the...

20060022749 - Method of preventing abrupt voltage changes at the outputs of a pair of amplifiers and control circuit for a pair of amplifiers self-configuring in a bridge configuration: A common mode control circuit reduces abrupt voltage changes at the outputs of a pair of amplifiers which, in turn, reduces EMI and distortions that occur when the correlation between the signals fed to the four channels of an audio system diminishes. The common mode control circuit generates for each...

20060022750 - High frequency amplifier: A high frequency amplifier comprising a first trans-impedance amplifier, a second trans-impedance amplifier, a third amplifier, and a variant current source is provided. The first trans-impedance amplifier receives an input current and outputs a first output voltage accordingly. The second trans-impedance outputs a second voltage. The third amplifier receives the...

20060022751 - Power amplifier arrangement and method for memory correction/linearization: A device, system, and method are provided for a power amplifier arrangement. In embodiments of a Vdd modulated power amplifier arrangement, a memory correction block includes a Vdd predictor for predicting waveform distortions of a Vdd modulated power supply and a main-path corrector for pre-distorting the input to the power...

20060022752 - Power amplifier apparatus and dc component removing method: A power amplifier apparatus includes a dither superimposing unit superimposing DC dither on a digital signal; a switching signal generating unit converting the digital signal on which the DC dither is superimposed by the dither superimposing unit to a pair of drive pulses on high and low sides having opposite...

20060022753 - Method and apparatus for controlling common-mode output voltage in fully differential amplifiers: A method for controlling the common-mode output voltage in a fully differential amplifier includes comparing a sensed common-mode output voltage of the fully differential amplifier to a reference voltage, and generating an error signal representing the difference between the sensed common-mode output voltage and the reference voltage. The error signal...

20060022754 - Buffer circuit: A buffer circuit comprised of two matched stages is provided. The first stage develops a replica voltage that is used in the second stage as the input to a wide-band amplifier. The combination of the two feedback loops in the circuit result in improved linearity. The first amplifier dominates for...

20060022755 - Nagative conductance power amplifier: Power amplifiers are disclosed that demonstrate improved linearity and efficiency in applications requiring significant peak-to-average ratios (PAR). A power amplifier in accordance with the present invention comprises a first transistor in an input stage that converts DC power into AC power; and a second transistor in a negative conductance stage...

20060022756 - Power amplifier arrangement and method for processing a radiofrequency signal: A power amplifier arrangement comprises a power amplifier in a semiconductor body. At least one first input terminal on the surface of the semiconductor body is provided for feeding in a signal to be amplified. A first output tap of the arrangement is designed for outputting a signal with a...