Bridge driver amplifier and telecommunication equipment

Power amplifier and its control circuit The power amplifier includes a bias control terminal, an output changeover switch, a nonlinear amplification channel and a linear amplification channel. The nonlinear amplification channel includes a variable gain amplifier whose gain is set to a predetermined value, and a linear amplifier and a nonlinear amplifier that amplify the output of the variable gain amplifier by controlling the bias of the variable gain amplifier with the output of the bias control circuit. In the linear amplification channel, the gain of the linear amplifier is set to be constant, and the gain of the variable gain amplifier before the linear amplifier is adjusted by controlling its bias voltage, thereby controlling the output level of the power amplifier. Select one of the two amplification channels according to the required system through the output changeover switch.

power amplifier

Integrated circuit amplifier independent of battery polarity

An amplifier that combines hyperbolic tangent and hyperbolic sine transfer function to eliminate distortion.

Digital power amplifier

Adaptive method and amplifier device

[0009] Radio communication device and transmission power control method thereof

Device and method for linearizing power amplifier in mobile wireless communication system

[00 1 1] Audio-visual equipment amplifier

Oversampling noise shaping mixed signal processor.

Synthetic linear power amplification device and method

Wireless communication equipment and transmission power control method thereof

[00 15] nonlinear compensator

Gain controllable low noise amplifier with automatic linear enhancement and method thereof

[00 18] pulse width modulation amplifier

Adaptive gain and/or phase adjustment control system and method

Differential amplifier circuit

[002 1] High-frequency amplifier and amplifying element

Terminal structure of high speed and high pin density chip

electronic tuning unit

Biasing circuit of multistage power amplifier and biasing method thereof

The gain characteristic compensation circuit

operational amplifier

[0027] Method and system for reducing the over-spectral power distribution of pulse carrier class C saturation amplification.

A device with an amplifier including a safety device and a filter connected to the amplifier.

[0029] A semiconductor circuit capable of compensating distortion caused by environmental temperature change.

[0030] Adaptive adjustment method and device of feedforward linearization amplifier.

Memory-based amplifier load regulation system.

Amplifier output stage

A kind of protection circuit

Control method and control device

Nested feedforward distortion reduction system

[0036] High-frequency variable gain amplifier device and bandgap reference circuit and method of wireless communication terminal [0037]

[0038] High gain amplifier with limited output dynamic range

[0039] Multi-reference high-precision switching amplifier

Comb filter and its adjusting method

[004 1] A feedforward amplifier network with swept pilot tones is used to reduce the distortion generated by power amplifiers.

Wide frequency range shunt regulation push-pull circuit

High efficiency RF amplifier

A method for improving the stability of an operational amplifier circuit at a specific frequency.

Adjustable metal oxide semiconductor linear transconductance amplifier

Reference voltage generating circuit

Feedforward amplifier

Feedforward amplification system and method

Method and device for amplifying signal

[0050] High speed and high gain operational amplifier

[005 1] power amplifier

Microwave amplifier for reducing pulsating noise

Method for reducing zero-crossing distortion and noise in amplifier, amplifier, method and amplifier. ...

Improved feedforward amplifier circuit including automatic gain and phase controller

[0055] Power amplifier predistortion correction device and method

[0056] High-frequency amplifier and input buffer circuit of communication receiver or radio transceiver [0057]

Buffer amplifier circuit

Feedforward amplifier with digital intermodulation control

Inverting amplifier circuit

Method for linearizing a power amplifier over a wide frequency band

Microwave amplifier

pmgrammable gain amplifier

The amplifier circuit

[0065] Multi-stage front-end circuit of TV tuner

tuned amplifier

[0067] An automatic control system for reducing distortion generated by a circuit.

Automatic microwave gain control device

Amplifier and method for power amplification

High efficiency power amplifier

Flexible current control in power amplifier.

Hybrid amplifier

[0073] Semiconductor integrated circuit power supply circuit

A secondary sense amplifier with a window discriminator from timing operation is used

Efficient signal power amplification method and device

[0076] Amplifier [0077] Predistortion circuit of RF amplifier

Semiconductor circuit with stable gain slope

operational amplifier

Transimpedance amplifier

[008 1] Logarithmic amplifier circuit

Pulse modulated power amplifier with enhanced cascade control method

[0083] A method for reducing amplifier noise and its ultra-low noise preamplifier.

[0084] High-efficiency amplifier wireless transmitting device with amplifying element and measuring device.

[0085] An amplifier that synchronously controls the bias current of the last stage through the signal change rate.

Bipolar operational transconductance amplifier based on inverse hyperbolic tangent to hyperbolic tangent transformation

Feedforward amplifier

[0088] Efficient parallel stage power amplifier

Circuit and method for linearizing amplitude modulation in power amplifier

Class d amplifier

[009 1] Linearization circuit for linearizing nonlinear components controlled by control voltage.

Improved feedforward multi-carrier linear RF power amplifier

Low distortion power amplifier

A charge sensitive amplifier circuit

Mobile phone power amplifier

Amplifier device of dual-mode class D amplifier with transient recovery auxiliary device

[0098] Automatic calibration of low distortion amplifier on integrated board.

Load envelope follower amplifier system

An input amplifier for an input signal with a steep edge.

[0 10 1] push-pull broadband semiconductor amplifier

A method and device for continuous-time filtering in digital CMOS process.

Linearization method of amplifier with feedforward correction.

[0 104] photoelectric coupling inverter circuit

[0 105] IF amplifier

[0 106] Pulse-based control method for enhanced power amplification of pulse modulated signals

[0 107] differential amplifier

Integrated circuit device with bias circuit of enhanced transistor circuit.

Radio frequency amplifier with improved compound three-beat frequency and cross modulation performance.

[0110] 2n-fold power boosting composite transistor and its ultra-fidelity open-loop constant current power amplifier.

[011] monolithic class d amplifier

A linear power amplifier and a method for eliminating intermodulation distortion signals.

[0 1 13] tuning amplifier

[0 1 14] intermediate voltage generating circuit

[0 1 15] feed-forward amplifier

[0 1 16] Dual-band amplifier [0 1 17] Class D amplifier with low noise and low distortion.

[0 1 18] feedback signal amplification processing method

[0 1 19] Equipment including mixing separator

[0 120] Full Suspension BL Audio Power Amplifier

[0 12 1] differential amplifier, integrated circuit and telephone

Power amplifier with monitoring and circuit protection.

[0 123] An input amplifier turns off the current at one side for an input signal with a steep edge.

Apparatus and method for remote communication

[0 125] A control device that can obtain correct control performance without increasing the number of interface wires.

Pilot signal detection system using band-stop filter.

[0 127] Inverse protection of operational amplifier

[0 128] feedforward amplifier

[0 129]

[0 130] overcurrent detection circuit and self-adjusting blanking.

[0 13 1] dual-band transmitter

[0 132] Buffered High Frequency Tuned Amplifier

[0 133] Anti-power-off sonic boom device

A novel CMOS charge pump and its cascade method.

[0 135]

[0 136] field effect transistor amplifier bias circuit [0 137] bipolar transistor high frequency power amplifier.

[0 138] semiconductor device

[0 139] dynamic automatic bias power amplifier

Method and apparatus for wideband predistortion linearization.

Forming method of [0 14 1] linearization circuit

Method and device for digital dynamic bias of amplifier.

[0 143] high input impedance single-ended low power supply voltage magnetoresistive preamplifier circuit

[0 144] 1 bit all-digital high-efficiency power amplifier

Method and system for configuring digitizer in hybrid matrix amplifier

[0 146] Ultra-fidelity open-loop transistor constant current amplifier

Differential amplifier and compensation method

Radio frequency power amplifier control system.

Alternating gain and phase control system and method

[0 150] A device for reducing and stabilizing the amplification factor of Darlington coupling output stage.

[0 15 1] small amplitude signal output circuit

Method and apparatus for filtering intermodulation products in a radio communication system

[0 153] Bias of Low Voltage Transistor

[0 154] stable bias current and high efficiency class a open-loop transistor constant current amplifier

Audio amplifier circuit and audio equipment using the same

[0 156] Intermodulation compensation of multi-channel amplifier [0 157] Amplifier system with load control to generate amplitude envelope.

[0 158] hybrid matrix amplifier with noise reduction function

[0 159] amplifier circuit

[0 160] High-power steady-state amplifier with parallel high-voltage metal oxide semiconductor field effect transistors

[0 16 1] amplifier circuit

[0 162] single-stage power amplifier

[0 163] * * Base Biased Power Amplifier

[0 164] Method for compensating nonlinearity of amplifier, amplifier and application of the method and amplifier.

[0 165] high gain amplifier

Stable power amplifier device and transceiver terminal with the device

Improvement of feedforward amplifier

[0 168] High-frequency amplifier with protection circuit and wireless transmitting device including the amplifier.

[0 169] transistor * * * set-* * base, * * set-* * base-* * set amplifier circuit

[0 170] power amplifier

[0 17 1] power amplifier system

[0 172] microwave mixing circuit and down converter

[0 173] Similar to the output stage of power amplifier, it has parallel voltage stabilization and fast thermal tracking bias compensation circuit.

Method and device in telecommunication system

[0 175] Unbalanced/Balanced Transform Ultra-fidelity Open-loop Transistor Constant Current Amplifier

[0 176] Linearization method and amplifier configuration of power supply midpoint floating power amplifier [0 177]

[0 178] microwave amplifier

[0 179] Display driving device with variable driving capability

[0 180] Linear adjusting device of amplifier circuit