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5869998 |
Amplifier circuit having independent gain and response time adjustments
An amplifier circuit (20) having independent gain and response time adjustments includes an amplifier (22), a response time resistor (30), a variable gain resistor (32) attached to the response...
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5854573 |
Low-voltage multipath-miller-zero-compensated CMOs class-AB operational amplifier
A low-voltage multipath-miller-zero-compensated operational amplifier is disclosed which includes a class AB front stage and a class AB back stage. The front stage has an inverted input, a...
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5812023 |
Voltage offset compensation circuit
A voltage offset compensation circuit for a high gain amplifier having a fixed input voltage offset, includes sample and hold circuitry for periodically sampling the offset voltage and gain error...
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5802451 |
Non-linear compensation circuit for a power amplifier
In a radio communication device which includes at least a modulator, a power amplifier, a demodulator, and a carrier oscillator wherein an input signal to the radio communication device is...
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5793817 |
DC offset reduction in a transmitter
A transmitter comprising at least first and second phase related signal paths, respective frequency up-converters, a combiner for combining the output of the respective frequency up-converters and...
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5783968 |
RF amplifier method and apparatus
An RF power amplifier (100) includes a feedback loop with a loop phase, and is arranged for amplifying an RF signal (1). During an initial stabilizing mode (201), the amplifier is stabilized by...
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5751184 |
Low electrical power consumption filter circuit
A low electric power consumption filter circuit includes an amplifying portion including an odd number of serial MOS inverters. A grounded capacitance is connected between an output of the...
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5745010 |
Operational amplifier
An operational amplifier including reverse amplifiers interconnected in series in an odd number of stages not less than three, an element for feeding back an output from the reverse amplifier in...
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5734294 |
Large swing wide band high order programmable active filters
A wide band, high-order, programmable video filter is implemented using transimpedance-based active integrators. An input voltage which may for instance represent a composite video signal is...
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5731737 |
Method and apparatus for reducing clock switching noise in continuous time filters
A method and apparatus for reducing reference frequency signal and/or clock switching noise in self-tuned integrated continuous-time filters. In the master-slave automatic tuning scheme, one or...
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5724006 |
Circuit arrangement with controllable transmission characteristics
A circuit arrangement which has a controllable transmission characteristic between a signal input (2) and a signal output (5) for a signal within a given transmission frequency band, the circuit...
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5708376 |
Variable-gain amplifying device
A variable-gain amplifying device uses different gains for amplifying an input bias voltage signal, and an input composite signal produced by superposing an input bias voltage signal on an input...
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5701099 |
Transconductor-C filter element with coarse and fine adjustment
A transconductor-C filter that has coarse and fine control mechanisms allowing for both high speed and high current filtering of the same signal. The filter uses a current controlled oscillator and...
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5699006 |
DC blocking apparatus and technique for sampled data filters
A sampled data filter (400) provides on-chip blocking of DC signals. The addition of a very long time constant (VLTC) integrator (412) into the negative feedback path (414) of a first sampled data...
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5686861 |
Filter circuit
A filter circuit that consumes very little electric power. The active filter is a linear inverter constructed by 1) an inverting amplifying portion composed of an odd number of MOS inverters...
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5684430 |
Power amplifier adapted to simplify adjustment work for preventing occurrence of parasitic oscillation
A power amplifier includes a power distributor for dividing an input signal into a plurality of equally power-distributed signals; a plurality of amplifying elements for amplifying the plurality of...
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5661435 |
Low noise wide band amplifier
An amplifier circuit provides wide bandwidth low noise performance by minimizing the effect of a pole created by the feedback resistor and the capacitance of the input device, such as a photodiode....
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5650752 |
Amplifier circuit with parallel connected amplifiers
An amplifier circuit has a wide frequency range which is broader than the frequency range expected from its circuit parameters. The amplifier circuit comprises a plurality of unit amplifier...
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5635871 |
Low phase error amplifying
The invention features an apparatus and technique for amplifying a signal without creating a phase error. The apparatus is an active device with a restricted band width selected to include desired...
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5623226 |
Automatic calibration of carrier suppression and loop phase in a Cartesian amplifier
A transmitter comprises an input terminal for receiving a signal to be amplified, a forward amplification path having a power amplifier output stage and a feedback path used to improve linearity,...
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5621355 |
Sampled data-biasing of continuous time integrated circuit
Process-dependent characteristics of a continuous time circuit, e.g., particular the sensitivity of the corner frequency of a continuous time filter to variations in absolute capacitance, is...
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5610555 |
Low-voltage driven, audio signal amplifying apparatus and a portable acoustic system using said apparatus
The apparatus includes output stage amplifiers for receiving the respective outputs of preamplifiers provided in correspondence to the left and right channels in a stereo system. Negative feedback...
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RE35379 |
Completely differential filter with switched condensers using CMOS operational amplifiers with no common-mode feedback
The filter comprises at least one completely differential operational amplifier having two inputs and two outputs and at least one pair of feedback circuits connecting said outputs with respective...
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5576663 |
Wideband gain stable amplifier
A method and apparatus for increasing the bandwidth of an operational amplifier and including a capacitor being connected across the inverting and non-inverting inputs of the operational amplifier...
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5568086 |
Linear power amplifier for high efficiency multi-carrier performance
A Doherty-type power amplifier suitable for satellite telecommunication systems provides linear amplification of noise-like RF signals that have multiple carriers spread over a large instantaneous...
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5535247 |
Frequency modifier for a transmitter
A transmitter has an oscillator (101, 201, 303, 401, 501) that operates at frequency k multiplied by f c , thus the oscillator (101, 201, 303, 401, 501) outputs a signal at an output frequency, kf...
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5530402 |
Single sequential amplifier circuit
An RF signal amplifier comprising a single stage of amplification coupled through a first switch to the input of a SAW delay line and, after the SAW delay line is charged, through a second switch...
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5521549 |
Stabilization of closed-loop power controllers
A closed-loop power control system includes an analog input and an analog output. An analog signal applied to the analog input is summed with an analog signal derived from the analog output to...
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5512856 |
Method and apparatus for nonlinear compensation
A method and apparatus for compensating for nonlinear responses of capacitive loads using a load reference element.
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5508663 |
Pulse width modulation amplifier
In a pulse width modulation amplifier use for audio devices, an input side of an operational amplifier of a pulse width modulation amplifier is used as an alternating current amplifier by grounding...
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5500622 |
Audio signal processing circuit
An audio signal processing circuit includes an amplifier having a non-inverted input terminal, an inverted input terminal and an output terminal with an RC active filter connected across the output...
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5489873 |
Active low-pass filter
An active low-pass filter suitable as a 90° phase shifter circuit is provided which requires few external components when formed as an IC. The current resulting from the input signal outputted...
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5486790 |
Multistage amplifier with hybrid nested miller compensation
A high frequency amplifier circuit using hybrid nested Miller compensation (HNMC) as a means to frequency compensate amplifiers. The circuit comprises four amplifier stages, or any other even...
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5469114 |
Loss less RF feedback for power amplifier linearization
The method and apparatus for improving linearization of a radio frequency power amplifier which includes extracting a small portion of the output signal of the power amplifier and utilizing this...
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5467056 |
Very high speed precision amplifier
The high speed precision composite amplifier includes a compensation network (7) which corrects the low frequencey distortions of the high speed amplifier F (2).
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5448203 |
Negative-feedback amplifier and feedback controlling method thereof
A negative-feedback amplifier prevents deterioration of the open-loop gain and the distortion improvement effect despite changes in a sending frequency by demodulating a baseband signal from a...
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5440270 |
Linear-phase filter having high gain selectivity
A switched capacitor lowpass filter is disclosed having four cascaded general purpose switched capacitor active filter blocks that combine with each other to produce a particular overall transfer...
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5434867 |
Audio amplifier arrangement having a volume dependent tone control
An audio amplifier having a volume-dependent tone control which is inexpensive and hardly distorts the audio signal. A filter in the signal path of the audio amplifier determines the tone control...
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5430412 |
Amplifier with lossless feedback
An amplifier, suitable for use in a limited band at microwave frequencies, incorporates a single lossless feedback coupling element between the input port and output port of the gain circuitry. The...
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5408193 |
Active circuit filter for reducing conducted radiation from a load back to its power supply
An embodiment of the present invention comprises a series pass transistor with its emitter arranged to receive a source of DC power, its collector arranged to supply a DC load, and its base...
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5396188 |
Active filter circuit
An active filter circuit has a filter circuit main part including a first conductance amplifier and a second conductance amplifier in which conductances are each proportional to currents or...
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5392000 |
Apparatus and method for frequency compensating an operational amplifier
A transimpedance circuit (201), and method therefor, frequency compensates an operational amplifier. The transimpedance circuit (201) has an input terminal (205) coupled to receive an amplified...
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5381108 |
Automatic calibration of the quadrature balance within a cartesian amplifier
A Cartesian amplifier in which an input signal is pre-processed and split into two quadrature components. Both quadrature components are passed, in parallel, through an error amplifier (4), after...
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5371472 |
Charge amplifier for sensors outputting electrical charge
A charge amplifier for sensors outputting electrical charge, particularly for piezoceramic pressure sensors, includes a voltage integrator having an output, an integration capacitor and a resistor...
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5371479 |
Pre-amplifier with multi-stage feedback
A circuit for amplifying an input signal comprises an operational amplifi a dual operational amplifier, and a buffering operational amplifier all cascaded in the aforementioned order. The first...
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5365187 |
Power amplifier utilizing the vector addition of two constant envelope carriers
A power amplifier having a gain factor of G for generating an output signal from a low power amplitude and phase modulated input signal. The power amplifier generates first and second constant...
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5363055 |
Photodiode preamplifier with programmable gain amplification
A combined programmable gain and integrating amplifier comprises an operational amplifier having an inverting input terminal coupled to a reference voltage. A plurality of capacitors are...
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5352986 |
Closed loop power controller
A power controller includes a closed-loop system having a summer to sum an input signal with a derived output signal to produce a difference signal. A comparator compares the difference signal with...
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5349300 |
Method and apparatus for controlling a peak envelope power of a PA
A method and apparatus is provided for controlling peak envelope power level in a power amplifier (PA) (10). The method includes the steps of measuring (101) a first peak envelope power value of an...
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5311141 |
Active filter circuit
An active filter having a frequency characteristics of the fewer variations of manufacturing and the least temperature dependency is provided. A differential amplifier is comprised of resistors 15...
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