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7432766 |
Front end for an instrumentation amplifier
An amplifier system includes an instrumentation amplifier arrangement being designed to amplify the difference between two voltage inputs with a defined gain, and to produce a single-ended output...
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7423491 |
Semiconductor amplifier
A first power source 11 for supplying a bias voltage to a gate electrode G of a field effect transistor 13 , which amplifies high-frequency signals, and a second power source 15 for supplying...
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7391267 |
Output circuit
A patterning area of an output circuit is reduced while securing strong enough ESD tolerance. In the output circuit of this invention, an output of a first amplifier and an output of a second...
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7375589 |
Power amplifier system provided with improved protection function
The present invention provides a power amplifier system that includes a power terminal, a ground terminal, an output terminal, a ripple terminal, a control terminal, a power amplifier circuit...
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7362871 |
Audio amplifier circuit and audio IC having the same
In the present invention, in parallel with a resistor which determines an amplification rate being fed back from an output to an input of an output stage OP amp in an audio amplifier circuit,...
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7362181 |
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...
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7362180 |
Protection circuit of digital amplifier
A protection circuit of a digital amplifier includes a DC voltage detection circuit for detecting a DC voltage occurring in a loudspeaker output terminal; a control circuit for performing...
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7355476 |
Input stage for an amplifier
In one embodiment, the present invention includes an amplifier having an input to receive a radio frequency (RF) signal from an output node of a source. An input stage coupled to the amplifier...
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7352240 |
Method and apparatus for protecting devices in an RF power amplifier
A method and apparatus are provided for use with a power amplifier for protecting active devices on the power amplifier. A peak detector is used by control circuitry to detect the presence of a...
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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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7339424 |
Apparatus and method for controlling temperature of electronic apparatus
In an embodiment of this invention, if a state, in which duty ratio of a PWM signal is kept equal to or greater than a predetermined value, has been maintained for a first time period, the duty...
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7332969 |
Output offset protection for power amplifier
A output offset protection circuit provides protection of the load and the power amplifier through monitoring the temperature of the power transistor in the operational amplifier to detect fault...
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7327187 |
Method, circuit and power amplifier for detecting a fault, and method of protecting a circuit in a power amplifier from a fault occurrence
In a method of detecting a fault in a class D amplifier, an amplifier output signal is generated based on inverting a pulse width modulation signal corresponding to received audio data. The...
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7307478 |
Adjustable power amplifier and applications thereof
An adjustable power amplifier includes an input capacitor, an input transistor, an inductor, an output capacitor, and a gain module. The input capacitor includes a first plate and a second plate,...
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7301402 |
Soft saturation detection for power amplifiers
A soft saturation detection circuit for a radio frequency (“RF”) power amplifier is configured to detect the onset of soft saturation in an unambiguous and accurate manner. The circuit compares...
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7286010 |
Systems and methods for over-current protection
Systems and methods for over-current protection in all-digital amplifiers using low-cost current sensing mechanisms. An over-current hard clipping unit receives a digital audio signal, clips the...
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7276974 |
Method and apparatus for protecting RF power amplifiers
Method and apparatus are provided for protecting radio frequency (RF) power amplifiers. A circuit ( 10 ) is provided for limiting a supply current to a first stage (Q 3 ) of the RF power amplifier...
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7276968 |
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....
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7268990 |
Power amplifier protection
A power amplifier protection circuit that includes protection circuitry to variably shunt an input radio frequency (RF) signal to AC ground, turn off bias to an output transistor of a power...
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7262668 |
Semiconductor amplifier
A first power source 11 for supplying a bias voltage to a gate electrode G of a field effect transistor 13 , which amplifies high-frequency signals, and a second power source 15 for supplying...
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7262667 |
Radio frequency power amplifier
A radio frequency (RF) power amplification circuit including a power amplifier is provided for preventing breakdown of the power amplifier. The power amplifier includes an input for receiving RF...
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7256652 |
Differential input receiver having over-voltage protection
A differential receiver circuit. In one embodiment, the circuit includes first and second input transistors, each having a first terminal coupled to a bias node (a first and second bias node,...
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7253687 |
Clamping circuit for operational amplifiers
A differential input operational amplifier has a voltage clamp differential transistor pair coupled to an input differential transistor pair of the operational amplifier. The voltage clamp...
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7221227 |
Methods and apparatus for reducing output current oscillations of a driver provided with circuitry that senses and responds to excessive current draws of an output stage of the driver
In one embodiment, a method is provided for reducing output current oscillations of a driver provided with i) a current sensing circuit that senses excessive current draws of an output stage of the...
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7205843 |
Protection circuit for power amplifier
A directional coupler is provided on the output side of a power amplifier. An increase in reflected wave power from a load is detected through the directional coupler by an electric power detector...
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7205840 |
Wideband CMOS gain stage
A CMOS gain stage includes biasing circuitry configured to insure saturation of a subsequent stage without a source follower circuit. The CMOS gain stage is optionally powered by a supply voltage...
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7205834 |
Power amplifier
In a power amplifier driven by a pulse width modulation (PWM) signal, a first pair of drive pulses opposite in level to each other is formed from a first pulse width modulation signal whose...
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7202749 |
AC coupling technique for improved noise performance and simple biasing
A low noise amplifier (LNA), which utilizes an AC coupling technique that can internally bias diodes in such a way as to provide effective low noise amplification, is provided. The low noise...
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7196586 |
Oscillator amplifier circuit operable to provide symmetric current limiting and method of same
An amplifier circuit operable to provide symmetric current limiting. The amplifier circuit includes a common source amplifier for sourcing a current and receiving an voltage input, a current...
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7196585 |
Fast-response current limiting
An amplifier ( 10″ ) has a first amplifier stage ( 14 ) for producing a control current (I X ) in response to an input voltage. A second amplifier stage ( 16 ) has first ( 46 ) and second ( 38 )...
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7193474 |
Current limit circuit for power amplifiers
According to one embodiment of the invention, a circuit arrangement includes a regulator circuit. The circuit arrangement further includes a current limit circuit coupled to the regulator circuit....
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7190934 |
Reflected power suppression circuit
An amplifier 3 amplifies a transmission signal, and outputs the amplified signal to an antenna. A directional coupler 6 causes a portion of power passing through a first path connecting the...
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7167055 |
Voltage level detector for power amplifier protection control
A voltage level detector ( 8 ) which activates itself by monitoring the voltage level (V STB ) at a standby pin ( 5 ) during power-up of an audio power amplifier ( 10 ), and can detect fault...
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7164320 |
Current threshold circuit
A current threshold circuit includes a series impedance, a reference voltage source, and a comparison module. The series impedance couples an output of a current source to a load, wherein impedance...
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7161990 |
Predistortion amplifier
Unlike a prior art digital predistortion compensation device for determining a compensation coefficient based on absolute value information about a baseband complex input signal, the present...
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7158633 |
Method and apparatus for monitoring subscriber loop interface circuitry power dissipation
Subscriber line interface circuitry includes an integrated circuit having sense inputs for a sensed tip signal and a sensed ring signal of a subscriber loop. The integrated circuit generates a...
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7157968 |
Method and apparatus for protecting a switching amplifier from excess current
A class D switching amplifier has a pulse width modulator that drives a speaker. The amplifier includes an over-current protection circuit, which includes current-monitoring MOSFETs that are each...
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7145397 |
Output overvoltage protection circuit for power amplifier
Disclosed is an output overvoltage protection circuit for a power amplifier having a plurality of stages, which comprises a monitor circuit for monitoring an output overvoltage of an output...
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7145396 |
Method and apparatus for protecting devices in an RF power amplifier
A method and apparatus are provided for use with a power amplifier for protecting active devices on the power amplifier. A peak detector is used by control circuitry to detect the presence of a...
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7136774 |
Sense amplifier thermal correction scheme
A system and method of adjusting a sense amplifier includes providing an amplification control parameter to the sense amplifier. A temperature of the sense amplifier is monitored and the...
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7132886 |
Detecting load current in multi-reference amplifiers
A method and apparatus are disclosed for inferring amplifier load current from an internal control voltage governing a reference voltage in a multi-reference amplifier. Multi-reference amplifiers...
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7113042 |
Low noise op amp
The present invention relates amplifiers using metal oxide semiconductor based integrated circuits. The present invention is particularly but not exclusively related to audio application mixed...
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7109801 |
Low gate oxide stress power amplifier
A power amplifier includes an input transistor, an output transistor, and circuitry. The input transistor includes an input, a first node, and a second node, wherein the second node of the input...
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7102445 |
Power amplifier module
An amplifier 2 c amplifies a transmit signal and outputs the amplified transmit signal to an antenna 10 . A drive current for driving the amplifier 2 c is inputted to a drive current input...
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7075373 |
Overcurrent protection circuit with fast current limiting control
An overcurrent protection circuit for a power transistor includes a transconductance amplifier and a bias current circuit. The transconductance amplifier receives a first signal indicative of the...
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7043033 |
Mode control for audio amplifier coupling
An audio amplifier system includes two amplifiers that are configured to drive loads through either DC or AC coupling. A third amplifier provides an AC ground return when the system is configured...
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7034610 |
Apparatus, system, and method for amplifying a signal, and applications thereof
An upstream amplifier is integrated on a substrate with a digital-to-analog converter (DAC) to form an integrated circuit. In an embodiment, a low-pass filter is also integrated on the substrate....
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7030700 |
Voltage level detector for power amplifier protection control
A voltage level detector ( 8 ) activates itself through monitoring the voltage level (VSTB) at a standby pin ( 5 ) during power-up of an audio power amplifier ( 10 ), and can detect fault...
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7005924 |
Current limiting circuit with rapid response feedback loop
The current limiting circuit of the present invention includes a transconductance amplifier having two outputs and forming a conventional feedback loop. A first output connects to an output...
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6998920 |
Monolithically fabricated HBT amplification stage with current limiting FET
A monolithically integrated amplifier comprising at least one heterojunction bipolar transistor and at least one field effect transistor is disclosed wherein the field effect transistor provides...
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