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7593484 |
Radio frequency (RF) receiver with double loop integrated fast response automatic gain control (AGC)
A radio frequency (RF) receiver device comprises a receiver system that receives an analog radio frequency signal and downconverts the analog radio frequency signal to a downconverted analog...
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7551023 |
Amplifier with low pass filter feedback
An amplifier is described which amplifies an input signal according to a defined amplification factor, and which generates an output signal. To reduce an offset fraction of the output signal the...
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7532427 |
TMR/GMR amplifier with input current compensation
An amplifier system with feedback current cancellation comprises an amplifier with at least one stage, a feedback network, first and second replica circuits, a buffer, second and third resistances,...
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7525391 |
Linear transimpedance amplifier with multiplexed gain stage
A linear transimpedance amplifier includes a forward transimpedance circuit that receives an input signal from an optical device. The forward transimpedance circuit generates a linear output...
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7515880 |
Variable gain frequency multiplier
A variable gain frequency multiplier comprises a multiplier circuit and a control circuit configured to receive a power control signal, the power control signal being proportional to a power output...
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7483678 |
Single chip GSM/EDGE transceiver architecture with closed loop power control
A single chip GSM/EDGE transceiver comprises a fully differential receive chain, a subharmonic mixer in the receive chain, the subharmonic mixer configured to receive a radio frequency (RF) input...
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7466196 |
Detector for automatic gain control
Provided is a detector for automatic gain control (AGC). The detector for AGC is used for a variable gain amplifier (VGA) including at least one VGA cell. The detector for AGC includes: first and...
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7423489 |
Low return loss resistive feedback amplifier
Embodiments related to resistive feedback amplifiers are presented herein.
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7420414 |
Amplifier, and step-down regulator and operational amplifier using the amplifier
An amplifier has an input stage amplifying circuit, an output stage amplifying circuit, and a negative feedback circuit. The input stage amplifying circuit differential-amplifies a first input...
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7420152 |
Wide-range linear output photo sensor circuit
A system and method for acquisition and conditioning of a signal received from a light sensor generating an input signal in proportion to a sensed amount of light, the system utilizing an...
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7403067 |
Compensation circuit for amplifiers having multiple stages
An amplifier circuit comprises a first capacitance having one end that communicates with an input of a first amplifier stage. An amplifier has a first gain, an input that communicates with an...
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7397307 |
Amplifier arrangement having an adjustable gain, and use thereof
According to one or more aspects of the present invention, an amplifier arrangement is disclosed. The arrangement comprises a first, a second and a third amplifier. The first and second amplifiers...
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7372327 |
Input structure for a power amplifier and associated methods
A method and apparatus provides an input structure for a power amplifier. In one example, the input structure has an input network and a predriver circuit to provide an input signal to the power...
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7368982 |
Balanced output circuit and electronic apparatus utilizing the same
In a balanced output circuit, an input signal inputted thereto is provided as a first output signal thereof on one hand, and on the other hand the input signal is inputted to an inverting...
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7355471 |
Circuit for DC offset cancellation
A circuit having multiple overlapped feedback loops for DC offset cancellation is provided with applying in one of multistage amplifier, multistage filter, and the combination thereof. The circuit...
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7348854 |
Automatic biasing and protection circuit for field effect transistor (FET) devices
A transistor biasing circuit is shown that utilizes a negative feedback loop control circuit to set the gate bias voltage in the output transistors of a power amplifier. This control circuit has a...
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7342445 |
Radio frequency power amplifier circuit and method
A method ( 200 ) and radio frequency amplifier circuit ( 100 ) for adjusting a gain setting of a power amplifier ( 102 ) and a gain setting of a power amplifier driver ( 106 ) that form part of the...
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7332971 |
Multi-gigabit/s transimpedance amplifier for optical networks
A Gigabit/s transimpedance amplifier system includes a forward-path amplifier section with a very large bandwidth and an overall frequency-selective feedback section which is active only from DC to...
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7317351 |
Low noise amplifier
A low noise amplifier (LNA) is discussed. In implementations, a LNA may include a feedback section coupled to a transistor. The feedback section may have a resistive portion including a buffer and...
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7301394 |
Impedance matched variable gain low noise amplifier using shunt feed-back
The variable gain amplifier includes a forward path that provides the amplifier variable gain, and a feedback path. The feedback path uses a switch that is turned on at low gain levels. The switch...
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7292100 |
Interpolated variable gain amplifier with multiple active feedback cells
An interpolated variable gain amplifier (VGA) utilizes multiple active feedback cells. The active feedback cells may be implemented as transconductance (gm) cells that replicate gm cells in the...
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7253680 |
Amplifier system with current-mode servo feedback
A system and method for compensating an amplifier apparatus for low frequency and/or DC components of an externally applied input signal as well as for any voltage offsets contributed by the...
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7250818 |
RF power amplifier circuit and RF transmitter and terminal including it
A RFPA (radio frequency power amplifier) circuit ( 150 ) which includes a RFPA ( 101 ), a supply voltage source ( 104 ), means ( 155 ) for applying to the RFPA a gain control bias voltage and a...
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7239207 |
Transimpedance amplifier
A filter comprising an off-chip capacitor is described. The off-chip capacitor may be coupled to a circuit bonding pad. The output terminal of an amplifier may be coupled to the circuit bonding pad...
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7233199 |
Circuit and method of establishing DC bias levels in an RF power amplifier
A method and apparatus is used to provide DC stabilization and noise reduction in a multistage power amplifier. The invention uses various feedback techniques to stabilize DC levels, which helps to...
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7202732 |
Transimpedance amplifier with linearized transconductance feedback
The invention relates to a feedback circuit for a transimpedance amplifier, which is typically used for converting an input current from a photodiode into an output voltage. The feedback circuit of...
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7183842 |
Optimum composite cascode amplifier
An improved amplifier circuit which effectively combines two amplifier stages by utilizing two nested feedback loops so that an inverting amplifier topology is used with a FET input device,...
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7164313 |
Method and apparatus for opening a feedback loop
Circuits, methods, and systems are provided for opening a primary feedback loop in a transmitter. An auxiliary feedback loop can be closed when the primary feedback loop is opened, and a controller...
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7157976 |
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...
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7154238 |
Semiconductor integrated circuit including a motor driving control apparatus having an amplitude regulation circuit
An amplitude regulation circuit which includes a maximum detection circuit which outputs a maximum signal MAX that is distorted to some extent during and around a time when a highest-level signal...
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7132885 |
Low phase shift implementation of the baseband circuitry of a Cartesian feedback loop
A circuit is provided that includes a Cartesian feedback loop. The Cartesian feedback loop includes one or more operational amplifiers. At least one of the operational amplifiers includes two or...
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7123095 |
High frequency power amplifier circuit and radio communication system
There is provided a high frequency power amplifier circuit capable of enhancing detection accuracy of an output level, necessary for feedback control of the high frequency power amplifier circuit,...
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7116163 |
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...
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7113020 |
Capacitance multiplier circuit exhibiting improving bandwidth
A monolithic capacitance multiplication circuit serves to reduce the required die area when larger capacitance values are needed such as in filter and loop frequency compensation circuits. A...
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7091773 |
Limiting circuit with level limited feedback
A limiting circuit includes an input transconductance stage, an output transconductance stage, a feedback transconductance stage, first and second resistive loads, and a level limiting circuit. The...
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7088182 |
Class AB output stage circuit with stable quiescent current
A class-AB output stage circuit is configured with controllable reference voltages for providing stable quiescent current. An exemplary output stage circuit comprises one or more control circuits,...
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7078965 |
Servo balancing among driver devices
A method and apparatus for reducing imbalances among the outputs of a plurality of driver devices connected in a parallel configuration to drive a common load. One driver is designated as the...
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7042284 |
Operational amplifier arrangement
An operational amplifier arrangement having a non-linear amplifier and a linear amplifier, both having a pair of input terminals one of which is coupled to an arrangement input terminal, and both...
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7026870 |
Low-noise active RC signal processing circuit
Disclosed is a low-noise active RC signal processing circuit, which comprises a feedforward section operable responsive to an input signal to provide an output at a predetermined gain, and a...
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7005950 |
Negative impedance converter
There is provided a negative impedance converter, which has negative impedance conversion function by widening the available range of a generalized impedance converter. A generalized impedance...
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7002308 |
Motor driving control method and apparatus with amplitude regulation circuit
An amplitude regulation circuit which includes a maximum detection circuit which outputs a maximum signal MAX that is distorted to some extent during and around a time when a highest-level signal...
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6998913 |
Method and apparatus for linear low-frequency feedback in monolithic low-noise charge amplifiers
A charge amplifier includes an amplifier, feedback circuit, and cancellation circuit. The feedback circuit includes a capacitor, inverter, and current mirror. The capacitor is coupled across the...
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6995610 |
Amplifier and radio frequency tuner
An LNA for use as an input stage of a radio frequency tuner comprises an inverting amplifier stage and a transconductance stage. The amplifier stage has an input connected via an input resistance...
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6975734 |
Audio apparatus of negative driving with adaptive gain control
An audio apparatus is constructed for use in negative drive of a loudspeaker having an internal impedance to perform a desired amplitude-frequency characteristic. In the audio apparatus, an...
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6919763 |
Transconductance amplifier for inductive loads and method for driving inductive loads
A transconductance amplifier for inductive loads and a relevant inductive load driving method, the amplifier having an input stage receiving a driving signal (set-point), a power stage connected...
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6870427 |
Process and device for controlling the operation of a bipolar transistor in class A
The operation of a bipolar transistor is controlled comprising by producing a first voltage that is a product of a static collector current of the bipolar transistor times an emitter resistance....
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6844784 |
Wide dynamic range transimpedance amplifier
A wide dynamic range transimpedance amplifier for fiber optics receivers. An automatic transimpedance gain control and DC cancellation control feedback circuit include a pnp transistor that is...
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6831510 |
Continuous low-frequency error cancellation in a high-speed differential amplifier
A signal processing module provides high-gain amplification of received signals, while canceling some or all low-frequency error in the received signal. The signal processing module includes a...
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6822506 |
Amplitude and rise-time sensitive timing-shaping filters with built-in pulse-tail cancellation for high count-rate operation
A continuous-time baseline restoration (BLR) circuit providing built-in pulse tail-cancellation, or BLR tail-cancel circuit, in constant fraction discriminator (CFD) arming and timing circuits. The...
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6819172 |
DC offset cancellation techniques
The present invention includes an offset cancellation device having input return loss characteristics suitable for high frequency operation.
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