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5982229 |
Signal processing scheme utilizing oversampled switched capacitor filter
A novel signal processing scheme comprises a digital to analog converter which is clocked at a first frequency, and a switched capacitor filter which receives input from the digital to analog...
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5982230 |
Amplifier circuit
An amplifier circuit having a programmable configuration which is selectable by a user. The amplifier circuit includes a pair of two-input differential input circuits. Each two-input differential...
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5982234 |
Low noise arrangement or an amplifier
The invention relates to an arrangement comprising a main amplifier (1, 10) and means (5) for creating, at least during predetermined periods, a floating references voltage (V G ) for applying at...
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5973536 |
Switched capacitor filter
A switched capacitor filter for applying a filter processing including an integration processing to input analog signals of plural channels on a time shared basis includes an integration sections...
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5963085 |
Input to output stage interface with virtual ground circuitry for rail to rail comparator
An interface stage for interfacing between input and output stages of a rail to rail comparator. The interface stage combines and amplifies four input stage output currents from the input stage,...
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5955918 |
Burst mode digital data amplifier circuit unit and amplifier circuit
An amplifier circuit unit is composed of an offset compensation circuit for equalizing and issuing a DC potential in data input period of one input signal of differential input signals, and a DC...
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5940235 |
Reproducing circuit for a magnetic head incorporating the voltage-to-current and an exponent current amplifier
A recording/reproducing apparatus for a magneto-resistive (MR) head having a playback amplifier, including a capacitor for a dc feedback low-pass filter for dc feedback to an initial-stage...
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5936463 |
Inverted amplifying circuit
An stable inverted amplifying circuit includes an odd number of CMOS inverters and a feedback capacitance. Balancing resistances decrease the inverter open gain and limit the gain of the entire...
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5926054 |
Modification of process control signals so as to enable reproduction apparatus to operate over an alternate process range
Modification of process control signals so as to enable electrostatographic reproduction apparatus, including a dielectric support member transported about a path into operative association with...
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5892375 |
Comparator with small signal suppression circuitry
A comparator circuit has first and second inputs and an output and includes means for operating the comparator in alternate autozero and comparator phases. During an autozero phase, the inputs of...
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5880630 |
Gain stage and offset voltage elimination method
A gain stage and offset voltage elimination method. The gain stage includes an amplifier, condensers and a number of switches. The switches are arranged to discharge the condensers and then charge...
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5869999 |
Open loop pre-amplifier for an electronic measuring system
A fast, open-loop amplifier for an electronic measuring system is formed by a folded, differential, open-loop amplifier. This amplifier includes a differential common-source portion, a current...
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5867777 |
Variable-gain amplifier circuit, offset control method in variable-gain amplifier circuit, radio receiver with variable-gain amplifier circuit, and radio receiving method in radio receiver with variable-gain amplifier
A variable-gain amplifier circuit has an offset correcting function by which the fluctuation of offset due to the switching of a gain is decreased. In an offset detection mode, an input offset...
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5847600 |
Multi-stage high-gain high-speed amplifier
A two-stage switched-capacitor residue amplifier having novel circuitry in the first and second stages provides fast and accurate settling while configured with a large closed-loop gain, and also...
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5847601 |
Switched capacitor common mode feedback circuit for differential operational amplifier and method
An operational amplifier circuit includes a differential operational amplifier and a common mode feedback circuit with first and second transistors (16 and 20) having source electrodes connected to...
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5847599 |
Stable fast settling sense amplifier
An amplifier for use in a MOS sensing array is disclosed. The amplifier includes an operational amplifier and a feedback capacitor. During an equalization period, the voltage between the output of...
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5841318 |
Low noise preamplifier for a magneto-resistive head tester
The present invention relates to an apparatus and method for amplifying a signal from a MR element of a hard disk drive magnetic recording head having a DC component and an AC component. The...
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5838200 |
Differential amplifier with switched capacitor common mode feedback
A differential amplifier with switched capacitor common mode feedback includes a differential telescopic cascode amplifier in which the differential output terminals are individually coupled to a...
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5835049 |
Amplifier for use in time-sharing applications
A differential amplifier has (at least) four input-stage transistors that are switchably coupled to the inverting and noninverting input terminals and to the output terminal(s). In one embodiment,...
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5812024 |
Stabilization of gain-bandwidth product in analog circuit devices
The gain-bandwidth product for an integrated circuit is stabilized by operating a first capacitance element that tracks a load capacitance of an integrated circuit to be stabilized over a given...
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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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5805019 |
Voltage gain amplifier for converting a single input to a differential output
The present invention relates to a voltage gain amplifier for converting a single analog input to a differential output and controlling a voltage gain, comprising a single input...
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5796300 |
Switched-capacitor amplifier offset voltage compensation circuit
Circuitry for reducing charge injection effects in an offset voltage compensation circuit for a switched-capacitor amplifier is provided. The switched-capacitor amplifier circuitry includes an...
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5796301 |
Offset cancellation circuit
An offset cancellation circuit of this invention includes operational amplifiers 11, 12 having fully differential outputs and common mode output, and comprises an adder 15 supplied with one Vo + 1...
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5793243 |
Method of stabilizing an electronic signal integrator
A signal integrator stabilization circuit comprises an operational amplifier functioning as a comparator. The circuit further comprises an attenuator in the amplifier's feedback, thereby generating...
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5789974 |
Calibrating the DC-offset of amplifiers
The dc-offset voltage of an amplifier is calibrated by: (1) configuring the amplifier as a comparator, (2) using the output of the comparator to drive the up/down select input of an up/down...
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5764103 |
Switching amplifiers into and out of circuits with reduced output noise
An insubstantial amount of noise results at the output of a circuit when an output of a primary amplifier is disconnected from and reconnected to the circuit in which is operating. The primary...
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5744993 |
Read channel for at least partially offsetting nonlinear signal effects associated with the use of magneto-resistive heads
Briefly, in accordance with one embodiment of the invention, a device for use in a magnetic recording read channel adapted to be coupled to a magneto-resistive (MR) read head comprises: an...
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5745002 |
Low voltage, switched capacitance circuit employing switched operational amplifiers with maximized voltage swing
A switched capacitance circuit, using a switched operational amplifier structure as an input switch of the switched capacitance, is provided with a new biasing circuit. An additional switched...
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5739720 |
Switched capacitor offset suppression
A switched-capacitor circuit that includes a first signal path disposed between a first input node and a first output node, and a second signal path disposed between a second input node and a...
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5736895 |
Biquadratic switched-capacitor filter using single operational amplifier
The present invention discloses a biquadratic switched-capacitor filter, which merely utilizes one operational amplifier to implement a biquadratic transfer function. The biquadratic...
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5724000 |
Differential switched capacitor filtering
A differential switched capcitor filter section which includes a differential amplifier (OTA), a first set of switched capacitors (C11, C12) coupled between a non-inverting output (+) and an...
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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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5699012 |
High gain, low offset input amplifier
An input signal buffer amplifier that has a high gain and a low offset voltage is implemented as an integrated circuit (IC) along with other components that perform further processing on an input...
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5680072 |
Differential interpolating switched capacitor filter and method
A differential, interpolating, switched capacitor filter and method of operation in which non-interpolating stages of the filter are clocked at a first frequency and a subsequent interpolating...
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5663680 |
Chopper stabilized amplifier having an additional differential amplifier stage for improved noise reduction
A chopper-stabilized amplifier having an additional differential amplifier stage for improved noise reduction. A main amplifier provides a fast AC path, while a nulling amplifier is used to zero...
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5659264 |
Temperature drift stabilized filter circuit
The output of a filter circuit utilizing a capacitance amplifier circuit is sufficiently stabilized in its temperature characteristics to improve the operational reliability of the circuit. There...
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5638020 |
Switched capacitor differential circuits
A switched capacitor differential circuit switches first and second differential input signals (Vinp1, Vinp2) to respective inputs (A, B) of an operational amplifier (12) via respective first and...
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5631603 |
Offset cancellation for differential amplifiers
A differential amplifier with improved offset cancellation is disclosed. The differential amplifier has a floating current source coupled to the drain terminals of the differential pair for...
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5621350 |
Circuit for amplifying a weak dircet voltage signal
A circuit for amplifying a weak direct voltage signal has a direct voltage amplifier that can be periodically switched from the direct voltage signal to a reference signal by a switching member...
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5617054 |
Switched capacitor voltage error compensating circuit
A compensating circuit (8) is used with a switched capacitor circuit (10) which includes a switched capacitor arrangement (12) and an op-amp (1) having a first input (14) coupled to a switched...
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5585756 |
Gated integrator with signal baseline subtraction
An ultrafast, high precision gated integrator includes an opamp having differential inputs. A signal to be integrated is applied to one of the differential inputs through a first input network, and...
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5578962 |
Instrumentation amplifier for sensor signal conditioning using low-cost, high-accuracy analog circuitry
A differential amplifier circuit that exhibits low temperature drift and a wide dynamic range includes a differential amplifier having first and second input terminals, first and second circuit...
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5565813 |
Apparatus for a low voltage differential amplifier incorporating switched capacitors
A low voltage differential amplifier 10 or comparator is accomplished by providing an differential amplifier 10 that includes a transistor bias simulator 32 and a capacitance circuit 36. The...
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5563587 |
Current cancellation circuit
A transmitter includes a sensor for sensing a primary process variable representative of a process, and providing a sensor output current. An integrator in the transmitter integrates the sensor...
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5548453 |
Reproducing circuit for magneto-resistive head having an initial amplifying stage, a differential amplifying stage, and means for controlling the time of operation thereof
A recording/reproducing apparatus for a magneto-resistive (MR) head having a playback amplifier, including a capacitor for a dc feedback low-pass filter for dc feedback to an initial-stage...
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5514999 |
Differential switched capacitor circuit
A differential switched capacitor circuit (6) for sampling a differential input signal (IP, IM) in different sampling phases (PHI0, PHI1) and for correcting errors at an output thereof, comprises: ...
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5508656 |
Amplifier with offset correction
A signal processing circuit that includes a differential amplifier and an integrator. The differential amplifier receives at a first input a signal to process and at a second input an offset...
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5488258 |
Circuit for muting noises in a power amplifier
A power detector is provided for detecting closing of a power switch in a power supply, for producing a power-on signal after a predetermined time from detection of the closing of the power switch....
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5486788 |
Chopper stabilized operational transconductance amplifier
A chopper stabilized current amplifier circuit is disclosed. The current amplifier circuit includes a main operational transconductance amplifier, a nulling transconductance amplifier, two...
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