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6333673 |
Electronic circuit
A switched capacitor anplifier circuit is provided with two independent reference voltages, one which provides an appropriate bias level for the amplifiers, and one which sets a common mode input...
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6329876 |
Noise reduction scheme for operational amplifiers
Methods and apparatus are described for generating or amplifying a differential signal. The output of a first op amp corresponds to one end of the differential signal. The output of a second op amp...
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6316992 |
DC offset calibration for a digital switching amplifier
An offset voltage calibration circuit for use with a digital switching amplifier. The calibration circuit includes an analog-to-digital converter for converting at least one DC offset voltage...
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6310515 |
CMOS track and hold amplifier
A switched Capacitor Track and Hold Amplifier having at least one signal input, at least one clock input and an output, comprising a sampling capacitor, a buffer amplifier connected between the...
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6310514 |
Amplifier that indicates its degree of calibration
An amplifier includes a first circuit and a second circuit. The first circuit, in a first mode of the amplifier, amplifies an input signal to produce a first output signal. The second circuit is...
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6307430 |
Noise reduction technique in chopper stabilized amplifier
Disclosed is a chopper-stabilized amplifier with current steering used as output switching and to be operated in a low power supply voltage environment.
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6300824 |
Analog offset cancellation method and circuit and amplifier using such circuit
An analog offset cancellation technique is based on the observation that the voltage developed across an inductor is proportional to the time derivative of the current passing through the inductor....
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6300805 |
Circuit for auto-zeroing a high impedance CMOS current driver
An improved auto-zeroing circuit for reducing offset currents from high impedance CMOS current drivers. The Auto zero circuit of the present invention contains means to disconnect the output of the...
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6292052 |
Output amplifier for a discrete filter-less optical reference receiver
An output amplifier for a strobed sampling circuit has first and second operational amplifiers coupled to receive the sampled output from the sampling circuit. The operational amplifiers each have...
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6288604 |
CMOS amplifier providing automatic offset cancellation
An amplifier circuit is responsive to an input data signal which is substantially DC balanced. The amplifier circuit is operative to generate an amplified data signal, and includes: a limiting...
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6262626 |
Circuit comprising means for reducing the DC-offset and the noise produced by an amplifier
An amplifier (AMP) is provided with a pair of choppers (CHP i ,CHP o ) in order to reduce the DC-offset and the noise produced by the amplifier (AMP). To obtain an optimal noise reduction the pair...
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6259316 |
Low voltage buffer amplifier for high speed sample and hold applications
An addition is made to the prior art amplifier of additional transistor (M9) controlled by the input voltage, Vin, in series with the second stage (M5, M6) and a capacitor level shifter (C1)...
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6255902 |
Switch amplifier circuit
An amplifier circuit with small die size and low power consumption is described. The design allows a number of switch amplifier circuits to be placed on a single chip. Each of the amplifiers...
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6252454 |
Calibrated quasi-autozeroed comparator systems and methods
A multistage comparator is calibrated to remove quasi-autozero voltages derived from the native comparator offset and autozero switch charge injection offsets. A multistage comparator includes a...
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6249181 |
Differential-mode charge transfer amplifier
A differential-mode charge transfer amplifier receives a differential input voltage and produces a proportional differential output voltage. The amplifier includes two CMOS charge transfer...
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6242974 |
Self-calibrating operational amplifier
A stable, reliable, op-amp circuit overcomes the adverse affect of input offset voltages, V OSI , present at the input of op-amp. In one application, such VOSI-compensated op-amps employ a standard...
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6225848 |
Method and apparatus for settling and maintaining a DC offset
A DC offset correction loop (200) utilizes a sign bit generator (204), binary search stage (206), and a digital-to-analog converter (208) in its feedback path to correct for DC offsets at the input...
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6225863 |
Offset adjusting apparatus for canceling offset voltage generated in difference amplifier
An offset adjusting apparatus includes transistor groups of transistors connected in parallel to each other. The transistor groups are connected in parallel to either a pair of transistors...
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6211729 |
Amplifier circuit with a switch bypass
An amplifier/switch circuit includes a first circuit input, a second circuit input, a circuit output, an amplifier, a switching circuit and a DC blocking capacitor. The amplifier has an amplifier...
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6198350 |
Signal amplifier with fast recovery time response, efficient output driver and DC offset cancellation capability
A signal amplifying circuit (24) includes level shifting input circuits (D1-D4) permitting input common-mode voltages (VIN1 and VIN2) of an amplifier and fault detection circuit (50) to vary...
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6194941 |
DC offset compensation circuit for a signal amplifier
A DC offset compensation circuit (34) for compensating for a DC offset voltage of a signal amplifier (24) includes a first sample and hold circuit (40) having an input receiving an amplifier output...
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6194962 |
Adaptive operational amplifier offset voltage trimming system
A system for adaptively trimming the input offset voltage of an op amp employing an input stage with complementary differential pairs provides accurate VD os trimming over the amplifier's entire...
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6191648 |
Switched-capacitor cosine filter circuit
A switched-capacitor cosine filter circuit includes a differential amplifier and a switched-capacitor circuit. A set of control signals cause the switched-capacitor circuit to selectively couple...
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6181454 |
Adaptive threshold controlled decision circuit immune to ringing components of digital signals
In an optical receiver, a photodiode converts an optical digital input signal to an electrical signal which is fed into a differential amplifier to produce a pair of true and complementary output...
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6169453 |
Error amplifier with a high common mode rejection
A differential amplifier provides a high common mode rejection while maintaining substantially unchanged the input dynamic range. The differential amplifier includes a comparator having inputs to...
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6166595 |
Linearization technique for analog to digital converters
A switched capacitor voltage amplifier having at least one signal input, at least one reference input, an output and a plurality of clock inputs, comprising a high voltage gain (e.g. 100 dB)...
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6147552 |
Chopper-stabilized operational amplifier including integrated circuit with true random voltage output
An improved chopper stabilized operational amplifier is disclosed, along with an improved method of timing the switchings of chopper switches in such an amplifier. The disclosure includes an...
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6140872 |
Offset-compensated amplifier input stage and method
An offset-compensated amplifier including an input stage (2) having a current source (10), first (11) and second (12) FETs each having a source connected to the current source, first (17) and...
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6140871 |
Switched capacitor amplifier circuit having bus precharge capability and method
An amplifier circuit for amplifying a difference between first and second input signals which is capable of precharge a node at which the second input signal is present thereby enhancing the speed...
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6137362 |
Low noise and high input dynamic range differential amplifier stage
The present invention relates to a differential stage including two first transistors respectively controlled by two components of a differential input voltage, these transistors being connected to...
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6130578 |
Chopper-stabilized amplifier with digital frequency modulated clocking and method
The chopping frequency driving a chopper-stabilized amplifier (CSA) is dynamically varied between an upper and lower frequency limit to reduce the intermodulation distortion, clock noise and...
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6121830 |
Regulating the gain of a circuit including a programmable current amplifier using a control signal
The invention relates to programmable amplifiers, more specifically to structural solutions of amplifiers realised on integrated circuits. In the amplifier according to the invention a differential...
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6121831 |
Apparatus and method for removing offset in a gain circuit
An offset-removing gain circuit where the detected offset is independent of the gain of the circuit. The gain circuit includes a differential amplifier transfer circuit with an input and a output,...
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6118338 |
Low noise amplifier circuit with an isolating switch topology
An amplifier/switch circuit includes a first circuit input, a second circuit input, a circuit output, an amplifier, a switching circuit and a DC blocking capacitor. The amplifier has an amplifier...
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6114980 |
Method and apparatus for settling a DC offset
A DC offset correction loop (200) utilizes a sign bit generator (204), binary search stage (206), and a digital-to-analog converter (208) in its feedback path to correct for DC offsets at the input...
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6107871 |
Double sampling analog low pass filter
A double sampling analog low pass filter for converting differential inputs of first and second analog signals into a single-ended output signal. The double sampling analog low pass filter having...
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6097248 |
Switched capacitor amplifier with one-clock delay
A switched capacitor amplifier useful in integrated circuits and capable of low power operation, wherein the amplifier comprises at least one first hold capacitor, at least one second hold...
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6091300 |
Method and apparatus for adjusting the input common mode voltage of a differential amplifier
A method and apparatus for adjusting the output common-mode of a differential amplifier is disclosed. This is accomplished by reducing the supply voltage to the differential amplifier during the...
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6091293 |
Amplifier circuit having AC reset capability and method
An amplifier circuit having a reset capability for use in analog-to-digital converter comparator stages and the like. First and second amplifier stages include first and transistor second switches,...
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6087897 |
Offset and non-linearity compensated amplifier and method
Circuitry in an amplifier (1) provides both auto-zeroing of offset errors and finite gain compensation. The circuitry includes a differential main amplifier (3) and a differential auxiliary...
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6066986 |
Integrated monolithic operational amplifier with electrically adjustable input offset voltage
An integrated operational amplifier device has an operational amplifier device, and means connected to the operational amplifier device for providing at least one of a positive and a negative...
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6064257 |
Chopper-stabilized operational amplifier
A chopper stabilized operational amplifier implemented on a single integrated circuit chip is disclosed. The disclosure includes a symmetrical random signal generator circuit that produces a true...
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6049246 |
Amplifier offset cancellation using current copier
A differential amplifier circuit achieves offset cancellation by supplying an offset correction current from a current copier circuit to the output of the differential amplifier. The current copier...
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6049247 |
Low-voltage common source switched-capacitor amplifier
The present disclosure describes a low-voltage switched-capacitor amplifier circuit that operates with supply voltage as low as one volt. The switched-capacitor amplifier circuit includes a...
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6046638 |
Receive amplifier for reception of high-speed data signals
A receive amplifier for high-speed data has a differential input stage with a very wide common-mode rejection range and low offset voltage. This input stage interfaces the differential data signals...
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6037836 |
Switched-capacitor amplifier circuit
A switched-capacitor amplifier circuit produces accurate output signal even if the input signal varies rapidly at every sampling phase. Two capacitors having the same capacitance are connected, in...
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6034569 |
Amplifier offset cancellation system
The DC level of the output of an amplifier may be dynamically adjusted depending on the operating conditions of the amplifier by comparing the output of the amplifier to a set reference value using...
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6031420 |
Operational amplifier arrangement
An operational amplifier arrangement includes besides the two-stage operational amplifier, a third stage for tracking and holding the input offset of the first stage during an offset compensation...
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6031480 |
Method and apparatus for implementing a pipelined A/D converter with inter-stage amplifiers having no common mode feedback circuitry
A pipelined analog-to-digital converter is disclosed having a plurality of sample and hold converter stages, each having an interstage amplifier (28) associated therewith. This is a differential...
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6028469 |
Electric circuit arrangement comprising a switchable feedback branch
An electric circuit having a switchable feedback branch switchable between a first feedback state, in which the circuit arrangement has a frequency response that is stable with respect to an...
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