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7629852 |
Circuits and methods for implementing transformer-coupled amplifiers at millimeter wave frequencies
Circuits and methods are provided for building integrated transformer-coupled amplifiers with on-chip transformers that are designed to resonate or otherwise tune parasitic capacitances to achieve...
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7609115 |
Input circuitry for transistor power amplifier and method for designing such circuitry
A circuit having: an input matching network; a transistor coupled to an output of the input matching network; and wherein the input matching network has a first input impedance when such input...
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7592873 |
Low noise amplifier
For a first transistor, a source thereof is coupled to an input terminal and a drain thereof is coupled to an output terminal. A first variable impedance circuit is arranged between a gate of the...
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7586376 |
Pre-power amplifier of load, switch array, and impedance compensation
A novel and useful load compensation circuit and associated pre-power amplifier constructed therefrom. The load compensation circuit functions to maintain a nearly constant output impedance of the...
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7567129 |
Monolithic flexible power amplifier using integrated tunable matching networks
A flexible power amplifier can be adapted during operation for use in connection with two or more different wireless standards. In at least one embodiment, adaptations to power transistor size, RF...
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7557648 |
Operational amplifier, integrating circuit, feedback amplifier, and controlling method of the feedback amplifier
An operational amplifier according to an embodiment of the present invention includes: an operational amplifier stage executing differential-amplification of an input voltage and a reference...
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7554411 |
Wireless transmitter having multiple programmable gain amplifiers (PGAs) with tuned impedance to provide substantially linear response
A method and apparatus are provided for enabling a transmitter to have a substantially linear magnitude response and a substantially linear phase response. The transmitter includes first and second...
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7532075 |
Bias circuit
A bias circuit 100 comprises: a first reactance means 2 connected to an AC circuit; a second reactance means 3 connected to the first reactance means 2 ; a switch 7 connected to a...
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7501897 |
High-power amplifier
A high-power amplifier changes matching conditions of an output matching circuit 5 connected between a final stage amplifying element 3 and an output terminal 8 in response to the output...
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7495515 |
Low-noise amplifier
Methods and corresponding systems in a low noise amplifier include selecting a selected sub-band for amplifying, wherein the selected sub-band is one of a plurality of sub-bands, wherein each...
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7439811 |
Broadband low noise amplifier and RF signal amplification method of the same
A broadband low noise amplifier and amplification method is provided. The broadband low noise amplifier includes an input terminal into which a radio frequency (RF) signal received by an antenna is...
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7432763 |
Gain boosting for tuned differential LC circuits
A gain boost circuit and methodology are described for providing improved gain boosting with tuned amplifier circuits, such as differential low noise amplifier circuits having output resonant tank...
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7432767 |
Tunable low noise amplifier
Tunable low noise amplifier using an RF current feed back loop (L) coupled between input (IM) and output (OM) means and including first (CAI) and second (CA 2 ) serially coupled first order lowpass...
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7417508 |
Multiple RF path amplifiers
An amplifier is disclosed for providing processing of a variable RF signal, the amplifier comprising a first parallel gain stage and a plurality of second parallel gain stages electrically disposed...
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7412219 |
High-frequency amplifier having simple circuit structure and television tuner using high-frequency amplifier
A high-frequency amplifier includes first and second amplifying stages disposed in parallel for amplifying VHF/UHF television signals. The first amplifying stage includes a first FET and a second...
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7411459 |
Current mode transconductor tuning device
A transconductor tuning device tuning a transconductance using a current. The transconductor tuning device includes a tuning section that applies a tuning current and a reference voltage to a...
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7405621 |
Apparatus for amplifying differential signal
An apparatus for amplifying differential signals is provided. The apparatus comprises a differential amplifier, a first impedance component, a second impedance component, a voltage source and a...
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7400203 |
Circuit with Q-enhancement cell having feedback loop
According to an example embodiment, an amplitude feedback loop may include an RF amplifier, a detector, a comparator, and a Q-enhancement cell. In an example embodiment, the RF amplifier has an...
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7394310 |
System and method for programmable switching characteristics of an analog switch in a transconductance amplifier
Provided are a method and system for controlling impedance in a transconductance amplifier. A system includes a first transconductance amplifier and a second transconductance amplifier configured...
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7391268 |
Power amplifying device comprising a stabilizing circuit
A power amplifying device includes a stabilizing circuit between an input terminal and an amplifier. The stabilizing circuit has a first line, a second line, and a third line. The first line is...
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7382197 |
Adaptive tuning circuit to maximize output signal amplitude for an amplifier
An adaptive tuning circuit to maximize the output signal amplitude of a band-pass amplifier, comprising a control circuit to tune the peak frequency of the amplifier by monitoring the change in the...
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7365606 |
Receiving amplifier, in particular for television receivers, and use of the receiving amplifier
A receiving amplifier includes a semiconductor body with a first node, a second node and an amplifier circuit. The amplifier includes at least one field-effect transistor, a first input, and a...
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7339437 |
Ultra-wideband constant gain CMOS amplifier
Circuitry and methods for improved amplifiers with large bandwidth and constant gain are provided. The combination of a synthetic inductive drain load and a bridged-T matching network provide...
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7332970 |
Integrated amplifier, electronic communication unit with integrated amplifier and method for operating the electronic communication unit with an integrated amplifier
An integrated amplifier has a resonant circuit with a tuneable center frequency, in which the resonant circuit has at least one coil and at least one varactor for varying a resonant frequency of...
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7323939 |
Low noise amplifier for wideband tunable matching
Provided is a low noise amplifier with a common source and a source degeneration, which has linearity, power gain, noise factor, and lossless input matching. The low noise amplifier includes: a...
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7321273 |
Off-chip LC circuit for lowest ground and VDD impedance for power amplifier
Off-chip LC circuit for lowest ground and VDD impedance for power amplifier. A novel approach is made by which a chip to PCB (Printer Circuit Board) interface may be made such that the ground and...
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7315212 |
Circuits and methods for implementing transformer-coupled amplifiers at millimeter wave frequencies
Circuits and methods are provided for building integrated transformer-coupled amplifiers with on-chip transformers that are designed to resonate or otherwise tune parasitic capacitances to achieve...
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7282998 |
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...
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7245187 |
Multi-standard amplifier
The present invention relates generally to amplifiers, and more specifically to multi-band and/or multi-standard low noise amplifiers. There are currently no inexpensive, highperformance,...
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7202734 |
Electronically tuned power amplifier
A circuit and method for electronically tuning an RF power amplifier. The output filter includes at least one electronically variable reactance. The electronically tuned power amplifier may be...
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7202747 |
Self-tuning variable impedance circuit for impedance matching of power amplifiers
A self-tuning variable impedance circuit provides improved performance. A variation in the power applied to the variable impedance circuit causes a corresponding change in the impedance of the...
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7193455 |
Programmable/tunable active RC filter
A programmable/tunable active low-pass filter at least has the resistors, capacitors and shunt control devices. It uses the linear property of the MOSFET to implement the shunt control devices....
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7158772 |
Filter for broadcast receiver tuner
A Gaussian family filter (e.g. an equiripple filter) comprises a first pole, a second pole, a third pole and a signal combiner. The first pole has a biquadratic low pass characteristic and is...
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7151411 |
Amplifier system and method
An embodiment of the present invention provides an amplifier system, comprising at least one variable impedance matching network, the output of which provides the input to at least one amplifier...
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7145395 |
Linear transconductance cell with wide tuning range
A transconductance cell is disclosed. The transconductance cell may be single-ended or differential. The transconductance cell may include a tunable degeneration circuit. The tunable degeneration...
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7123097 |
Ultra-wideband constant gain CMOS amplifier
Circuitry and methods for improved amplifiers with large bandwidth and constant gain are provided. The combination of a synthetic inductive drain load and a bridged-T matching network provide...
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7119631 |
Off-chip LC circuit for lowest ground and VDD impedance for power amplifier
Off-chip LC circuit for lowest ground and VDD impedance for power amplifier. A novel approach is made by which a chip to PCB (Printer Circuit Board) interface may be made such that the ground and...
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7091784 |
Tunable circuit including a switchable inductor
The frequency of a differential circuit can be advantageously adjusted using a switchable inductor. Specifically, the switchable inductor allows a base inductance to be increased by activating one...
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7091792 |
Methods and apparatus for amplification in a tuner
Methods and apparatus for amplifying a tuner input signal are disclosed. One embodiment of the invention is directed to a tuner amplifier system comprising a tuner amplifier input that receives a...
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7057464 |
Lineariser
The present invention relates to a lineariser for use with an amplifier. The lineariser comprises an input means and an output means. Input matching means are provided to receive an input signal. A...
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7038548 |
Amplifier circuit for AM broadcasting
An amplifier circuit for AM broadcasting for amplifying an inputted AM broadcast signal by an FET and outputting it. The amplifier circuit comprises FETs for signal amplification which are...
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7019594 |
Method and apparatus for analyzing performance of a multi-stage radio frequency amplifier
A method and an apparatus for analyzing performance of a multi-stage radio frequency amplifier are described. The method simplifies the multi-stage radio frequency amplifier into equivalent input...
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7009455 |
Tunable power amplifier matching circuit
A power amplifier matching circuit is provided. The matching circuit includes a ferro-electric tunable component. A control signal is applied to the tunable component, changing the component's...
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6977542 |
Adjusting the trans-conductance of a filter
A digital tuning circuit which generates a digital code representative of a difference of signals generated by a mirror trans-conductor circuit (having electrical characteristics similar to a...
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6977555 |
Tuner circuit
A tuner circuit includes a variable attenuator circuit including a PIN diode, disposed upstream of a variable-gain amplifier circuit and controlled according to the same AGC voltage used to control...
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6977562 |
Self-tuned matching network for high efficient power amplifiers
A passive interface circuit for coupling an output signal from a power amplifier to a load is disclosed. The interface presents an impedance to the power amplifier that increases as the power level...
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6963247 |
Gain stabilization technique for narrow band integrated low noise amplifiers
A resonant load circuit is disposed in an integrated circuit, where the resonant load circuit includes an integrated inductance in parallel with an integrated capacitance, and further includes a...
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6958652 |
Transconductance varying circuit of transconductor circuit, varying bandwidth filter circuit using the same and digital tuning circuit of transconductor-capacitor filter
The present invention relates to a circuit for varying bandwidth of transconductance-capacitor filter by controlling transconductance of a transconductance circuit, and a digital tuning circuit of...
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6949979 |
Designing methods and circuits for multi-band electronic circuits
The designing method and circuits for a multi-band electronic circuit having at least one transistor have been proposed. The proposed method includes steps of: (a) changing the capacitance between...
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6933779 |
Variable gain low noise amplifier
The present invention is related to a variable gain low noise amplifier that optimizes input matching, gain and noise characteristics, and linearity. The variable gain low noise amplifier according...
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