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7512387 |
Method and control system for controlling the output power of an RF amplifier system
A system for controlling a power supplied to a load from a radio frequency amplifier system includes a radio frequency signal generator adapted for generating a radio frequency signal, an amplifier...
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7403068 |
Method for double sampling loop negative feedback and double sampling negative feedback amplifier
A method for double sampling loop negative feedback comprising: obtaining a low-frequency feedback signal from the output of the amplifier; obtaining a high-frequency feedback signal from part of...
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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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7366427 |
Line driver with variable bandwidth control
A method and apparatus to provide bandwidth control in a high speed line driver circuit is described.
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7279970 |
Feedback circuit
For reducing various adverse effects due to provision of a low-pass filter, while suppressing an oscillation generated therein, there is provide a feedback circuit, having at least one operational...
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7151405 |
Estimating power amplifier non-linearity in accordance with memory depth
Reducing a non-linearity effect of a power amplifier includes receiving signals at off-line inverse and forward models. The signals include an input signal, a pre-distorted signal, and an output...
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7061313 |
Dual feedback linear amplifier
A dual feedback topology imparts stability to a multistage linear amplifier, particularly by improving overall amplifier phase margin at higher signal frequencies. With dual feedback, an inner...
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7053705 |
Mixed-mode (current-voltage) audio amplifier
A method and system for providing a mixed-mode (current- and voltage-source) audio amplifier is disclosed. The mixed-mode amplifier includes a voltage sensing feedback path including a first...
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7012466 |
Voltage-to-current converter
A load responds to a voltage-to-current converter including a differential amplifier. A sensing resistor is series connected with the load and first and second feedback resistors, respectively...
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7010284 |
Wireless communications device including power detector circuit coupled to sample signal at interior node of amplifier
A multi-stage amplifier is coupled with a power detector. The multi-stage amplifier includes a plurality of amplifier stages in series, with a signal path extending through them. The power detector...
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6946910 |
Configurable feedback path in an amplitude control system
A configurable feedback path is included in an amplitude control system having a signal source and an amplitude controller, and provides accurate tracking between a signal provided at a test port...
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6825718 |
Impedance matching circuit
The present invention discloses an impedance matching circuit which is suitable to be applied on an IC chip. The impedance matching circuit comprises a resistor unit, an OP amplifier circuit...
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6646463 |
Impedance emulator
A method and device to emulate impedances includes a pair of impedances connected in series between two circuit nodes, the impedances forming a voltage divider having at its midpoint a reference...
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6600367 |
Low distortion amplifier
An electronic amplifier providing very low distortion which includes an output stage with an output error correction stage containing two amplifiers and wherein there are at least four local...
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6566947 |
Combined active impedance and filter in line drivers
A line driver combining active impedance and filter in one stage for connection to a transmission line having a characteristic impedance. The line driver comprises an amplifier, a transformer with...
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6392478 |
Amplification device having an adjustable bandwidth
The invention relates to a device for amplifying electronic signals, including: an amplifier PRA, and a plurality of feedback loops G 1, G 2 placed between the output and the input of the...
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6359505 |
Complementary pair-configured telecommunication line driver having synthesized output impedance
A synthetic impedance line driver for driving a telecommunication line includes a complementary operational amplifier pair having cross-coupled positive feedback summing resistors. The driver...
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5939951 |
Methods and apparatus for modulating, demodulating and amplifying
An apparatus is disclosed for processing an input signal. The apparatus includes two feedback loops for generating output signal components from the input signal. Each loop contains an oscillator,...
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5856758 |
Low distortion driver employing positive feedback for reducing power loss in output impedance that effectively matches the impedance of driven line
A line driver with positive feedback reduces the output signal amplitude excursion required for driving a communication line, and enables the driver's output impedance to be synthesized using a...
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5828264 |
Two-stage operational amplifier circuit with wide output voltage swings
A two stage operational amplifier circuit comprises a first stage (31) having an input (2, 4) and an output, and a second stage (33) having an input and an output (19). The second stage input is...
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5815804 |
Dual-band filter network
A dual band filter network for a radio communication apparatus is provided. The network has an antenna (212) for receiving and transmitting signals from a first frequency band and a second...
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5719527 |
Method and apparatus for amplifying, modulating and demodulating
A highly efficient linear amplifier and/or modulator and demodulator comprising first and second feedback loops is provided. Each loop processes a component of the input signal and the component...
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5705951 |
Method for correction of error signals in a signal amplification system and an apparatus used for that purpose
In a method and by an apparatus for correction of error signals and for forming of an arbitrary transfer function being independent of the quality of a payload (loudspeaker; H1) included in a...
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5382919 |
Wideband constant impedance amplifiers
A family of wideband amplifier circuits using series and shunt feedback over two stages to achieve constant impedance, including single-ended, single-ended input/differential output and...
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5317277 |
Power amplifying apparatus for supplying A.C. signals having a maximum loop gain at a desired frequency
The invention features power amplifying apparatus with controllable frequency characteristic of the gain. The apparatus includes a band pass network of two cascaded amplifiers and multiple...
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4897610 |
Negative-feedback amplifier with accurately defined input or output impedance combined with high or low output or input impedance respectively
Negative-feedback amplifier provided with an active amplifier section operating approximately as a nullor and a negative feedback section, the amplifier having a high loop gain. The active...
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4775842 |
Multi-output feedback amplifier
A feedback amplifier for providing an amplified signal to first and second utilization networks includes first and second feedback paths. The amplifier output is coupled via a first coupling...
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4757270 |
High gain feedback amplifier
Feedforward of the source signal into the compensation mode of an operational amplifier produces more than an order of magnitude improvement in small-signal capability at high frequencies. The...
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4710727 |
Nonlinear distortion synthesizer using over-threshold power-function feedback
A nonlinear distortion synthesizer having an amplifier and one or more over-threshold power-function negative-feedback paths. Each negative-feedback path provides a feedback signal which is...
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4661789 |
Microwave recursive filter
A broadband microwave recursive filter that provides sharp transitions in the frequency domain between adjacent stop and passbands comprising a signal input node; a signal output node; a filter...
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4644138 |
Temperature control system with simplified controller and power supply
The invention includes a simple and inexpensive thermal controller and simple and inexpensive radio frequency alternating current generator which are provided in an improved temperature control...
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4453132 |
Active filter
An active filter includes a first active stage including an operational amplifier and feedback means wherein the non-inverting input terminal of the operational amplifier is at a ground potential;...
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4441085 |
Signal amplifying apparatus
In a signal amplifying apparatus which is provided with a amplifier, a feedback circuit having its input connected via a CR circuit to the output of the amplifier and its output connected to the...
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4420723 |
Phase locked loop amplifier for variable amplitude radio waves
A modulated carrier signal, the amplitude variations of which are smaller than the amplitude of the unmodulated carrier, is not very suitable for transmission over radio links because the required...
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4406923 |
Automatic loudness controller
The herein-described broadcast apparatus for controlling the loudness level of program signals includes a variable gain device for increasing or decreasing the level of incoming program material as...
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4358739 |
Wide-band direct-current coupled transistor amplifier
A wide-band direct-current coupled transistor amplifier is provided which exhibits uniform gain in a frequency range from direct-current to greater than 100 MHz, and which exhibits other desirable...
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4292468 |
Frequency selection circuit
A frequency selection circuit which is equivalent to an LCR series resonant circuit, though not provided with inductance and which can adjust resonant frequency, selectivity or quality factor Q and...
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4243943 |
Feedback systems
A feedback system for a multi-stage amplifier is disclosed which includes a nest of feedback loops centered on a particular stage, for example, on the output stage. This enables a very large amount...
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4169996 |
Operational amplifier with slew recovery enhancement
Improved slew recovery in a composite driving amplifier for driving a substantially reactive load including a feedback loop to the operational amplifier from the load for regulating the output of...
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4166982 |
Logical circuit reference electric level generating circuitry
The circuitry is arranged to develop a highly accurate and stable reference electric level voltage and/or current for distribution to a plurality of logical circuits on a semiconductor chip having...
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4151478 |
Nonlinearly variable gain apparatus
A nonlinearly variable gain circuit is utilized to produce an inverted logarithmic S curve of gain versus potentiometer rotation while using a linear resistance taper potentiometer. An operational...
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4107622 |
Tone controller
A feedback resistor is interposed between a reversing input terminal of an audio amplifier and at least one impedance circuit. The impedance circuit is connected to an output terminal of the...
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4106384 |
Variable filter circuit, especially for synthesizing and shaping tone signals
A variable filter circuit, especially for synthesizing and shaping tone signals, in which a variable light source is provided which influences light sensitive resistor elements in the filter...
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4088962 |
Self biasing differential amplifier
A self biasing low input impedance differential amplifier for current mode applications requiring wide bandwidth with response down to DC. A shunt-shunt differential mode feedback system in...
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4078215 |
Electronic filter circuit
An electronic filter circuit having controlled "Q" with variations in attenuation. A plurality of filter networks are connected in parallel between the output and the input of an amplifier in a...
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4069461 |
Amplifier circuit having two negative feedback circuits
The input stage of an amplifier circuit formed from first and second semiconductor differential amplifiers comprising a pair of transistors having emitter electrodes connected to each other,...
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4069459 |
Feedback capacitor divider
An amplifier circuit, comprising a capacitive-resistive network electrically connected between the input and output of the amplifier wherein the network provides equivalent capacitance between the...
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4066976 |
Amplifier with variable gain
An amplifier circuit having a variable transmission factor and an effective transmission frequency band delimited by a lower limit frequency is arranged to enable the value of the lower limit...
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4055813 |
Single adjustment multiple function calibration circuit
A single adjustable control is commonly connected with each of a plurality of feedback channels, which are selectively coupled in an amplifier circuit to provide the latter with different basic...
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4055792 |
Electrical control system for an exhaust gas sensor
A system for controlling the application of heat energy to a ceramic exhaust gas sensor and for linearizing the output signal from the sensor. The system compares, electrically, the resistance of a...
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