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4707667 |
Offset corrected amplifier
An amplifier circuit having offset voltage and offset voltage drift corrections which does not require resistive feedback and is suitable for use with unmatched high frequency field effect...
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4703283 |
Isolation amplifier with T-type modulator
An isolation amplifier including a full-wave modulator which applies to the primary winding of an isolation transformer an attenuated version of the input signal, to reduce the flux density in the...
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4697152 |
Fully differential switched capacitor amplifier having autozeroed common-mode feedback
A fully differential amplifier which is compensated for both input offset voltage error and output common-mode variation is provided. The differential amplifier provides two very accurate output...
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4695751 |
Sampling-data integrator with commutated capacitance utilizing a unitary-gain amplifier
Four switches are controlled two by two by clock signal generators without overlapping in such a manner as to connect alternatively a sampling capacitor to an input signal source and in parallel to...
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4694208 |
Current-impulse converter circuit with variable time constant
Circuit arrangement intended for evaluating currents of 7 or 8 orders of magnitude, particularly in thermoluminescent dosemeter (TLD) evaluation equipment, which comprises a digital gate (12) with...
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4667153 |
Automatic calibrator
A self calibrating electronic instrument for measuring a physical quantity. The instrument generates an internal correction signal that forces its output to zero whenever it is determined that no...
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4659928 |
Focal plane array infrared device
A focal plane array infrared device includes an optical system for focusing incoming infrared energy, a scanner for scanning the focused infrared energy onto a focal plane detector array for...
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4651110 |
Circuit arrangement for zero point balancing of an integrated operational amplifier
In a zero point balancing system employing a balance capacitor switched by means of semiconductor switches, balancing errors due to parasitic capacitance of these switches, as well as due to picked...
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4651032 |
Compensating integrator without feedback
A compensating integrator includes an integrator and a compensating capacitor. During a compensating period, the capacitor is charged with a voltage related to an error component of an input signal...
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4644304 |
Switched-capacitor pseudo-n-path filter
A switched capacitor pseudo-N-path filter stage includes an analog integrator circuit having an input, an output, and a feedback capacitor connected between the input and the output. A plurality of...
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4641105 |
Apparatus and method for noise reduction in a linear amplifier
In a circuit including a differential amplifier, a switching device is coupled to the input terminals of the differential amplifier for periodically applying signals thereto. A second switching...
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4636738 |
Parasitic compensated switched capacitor integrator
A switched capacitor integrator for receiving a single input signal is compensated for parasitic capacitance errors with a minimum amount of circuitry. Although a single-ended amplifier is...
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4633223 |
DC offset correction circuit utilizing switched capacitor differential integrator
An integrated circuit employing a differential integrator and switched capacitor network to provide auto-zeroing. The differential integrator utilizes a feedback circuit between its inputs and...
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4628274 |
Amplifier with input drift voltage compensation
The invention concerns an amplifier comprising means for compensating for the input drift voltage. During a preparation phase, the input signal of the amplifier (10) is nullified by...
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4623854 |
Switched capacitor filter
A switched capacitor filter having the same value of capacitance for the integrating capacitor of each filter channel. The use of the same value capacitance results in DC offset voltages for each...
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4622521 |
Precision operational amplifier using data sampling
Offsets in a chopper stabilized CMOS operational amplifier are nulled by adjusting the transconductance of the load transistors in the CMOS transistor pairs. This is accomplished by providing a...
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4617481 |
Amplifier circuit free from leakage between input and output ports
A leakage current between the inverting input terminal and the output terminal of an operational amplifier having a switch between the two terminals is prevented from flowing by equalizing the...
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4609877 |
Buffer circuit with differential structure for measurement of capacitive charges
In a buffer with an operational amplifier having two inputs and two outputs and two feedback capacitances are inserted two other capacitances which in the measurement stage are switched in parallel...
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4608533 |
Automatic compensation circuit for use with analog multiplier
An automatic compensation circuit for use with an analog multiplier is disclosed. At regular intervals at least one input to the analog multiplier is constrained to be zero for a short time. During...
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4605905 |
Amplifier input circuitry with compensation for pyroelectric effects
A bridge circuit for use with high gain high impedance direct-current amplifiers, when the input circuitry includes components subject to pyroelectric effects. The bridge includes temperature...
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4604584 |
Switched capacitor precision difference amplifier
A circuit which can selectively sample and hold two real time input voltages and provide an output voltage indicating the difference value of the input voltages is provided. A switched capacitor...
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4596956 |
Current amplifiers
An electrometer amplifier with automatic zero-error correction in which the input current is switched periodically between two amplifier channels by twin reed switches 2,2', the channel outputs...
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4594558 |
High-switching-speed d.c. amplifier with input-offset current compensation
A driver-sensor circuit for a circuit-testing device has a sensor amplifier (Q1, Q2, Q3, and Q4) for sensing the voltage on a device under test connected to its input-output terminal (12). The...
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4580103 |
Amplifier circuit arrangement for eliminating input signal offset in the output
In a semiconductor integrated circuit comprising an amplifier for detecting the presence of a carrier on an incoming wave signal, in order to suppress dc offset in the incoming wave and at the same...
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4577159 |
Low drift broadband amplifier
An amplifier having a low DC drift characteristic incorporates a DC drift compensator which periodically samples the DC input offset voltage of the amplifier, holds the sampled value, then corrects...
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4570183 |
Method and apparatus for measuring pulses of charge
The present invention relates to a method and to apparatus for measuring electric charge, in particular for measuring small electric charges which are present in rapid succession, as happens under...
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4565971 |
Parasitic insensitive auto-zeroed operational amplifier
An operational amplifier circuit which is substantially insensitive to inherent parasitic capacitance associated therewith is provided. An error voltage resulting from the parasitic capacitance is...
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4560975 |
Method of and apparatus for error compensation in electronic analog sensing systems and the like
Expensive electronics heretofore required to minimize errors introduced by component changes, such as voltage offsets, temperature or linearization errors or the like, are avoided by connecting...
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4555668 |
Gain amplifier
A novel switched capacitor gain stage uses a unique circuit design and clocking technique that reduces the component mismatch offset voltage and the clock-induced feedthrough offset voltage...
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4554511 |
Offset voltage correction network for instantaneous floating point amplifier
Disclosed is an instantaneous floating point amplifier which continuously generates an offset correction voltage level for each possible gain word controlling an internal cascaded amplifier. The...
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4546324 |
Digitally switched analog signal conditioner
A digitally switched analog signal conditioner comprising a plurality of pairs of input terminals, a junction, and an output terminal; a plurality of capacitors, first ends of the capacitors being...
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4543534 |
Offset compensated switched capacitor circuits
A switched capacitor type amplifier system including an operational amplifier is provided with compensating capacitive coupling during the non-sampling portion of the cycle from the output of the...
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4542354 |
Delta-sigma pulse modulator with offset compensation
A modulator is provided for converting an analog input to an output pulse train having an average amplitude proportional to the input signal. The modulator circuit employs delta-minus-sigma...
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4540949 |
Reference voltage circuit including a three-terminal operational amplifier with offset compensation
An operational amplifier has one noninverting input lead (116), and two inverting input leads (117a, 117b). One of these inverting input leads (117a) is utilized to compensate for the effects of...
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4539551 |
Differential voltage amplifier
A differential voltage amplifier comprises a first and second capacitive coupling type amplifiers in each of which an autozeroed mode period for setting an operating point and a signal amplifying...
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4531106 |
Switched capacitor circuits
A switched capacitor biquadratic filter (10; 20) includes means for dynamically shifting the level of the input voltage (V B , V D ; V X , V Y ,) of the amplifiers (12, 14), so that the need for a...
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4529965 |
Switched-capacitor circuit analog-to-digital converter
A switched-capacitor analog-to-digital converter implements a conversion scheme involving execution of an algorithmic technique of successive-approximation comprising a number of iterations...
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4527128 |
Bistate linear amplifier circuit
A linear amplifier output stage is provided with unity gain buffer means having an input coupled to the output terminal and an output coupled to the stage input. The unity gain buffer means is...
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4521743 |
Switched capacitor amplifier
A switched capacitor amplifier includes an operational amplifier with an inverting input terminal, a non-inverting input terminal, a bias current input terminal, and an output terminal. Current...
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4518923 |
Preamplifier
A preamplifier for a periodically varying input signal (PS), has an input terminal (4) connected to a control electrode (g) of a voltage-controlled transistor (6) and to a terminal (7) of a...
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4496858 |
Frequency to voltage converter
A frequency to voltage converter is described which utilizes an operational amplifier connected as a damped integrator and having a switched capacitive input and feedback element. If the capacitors...
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4495470 |
Offset balancing method and apparatus for a DC amplifier
Offset balancing method and apparatus for a DC amplifier including gain selection and polarity switching circuits are disclosed. During the offset compensation process, the amplifier input is...
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4492927 |
Offset voltage compensation circuit
A dual-tone multi-frequency (DTMF) tone generator circuit (10) produces selected frequency row and column tones which are combined to generate a DTMF signal. Key board scan circuits (42, 44) scan a...
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4490682 |
Instrumentation amplifier having automatic offset adjustment
An instrumentation amplifier having automatic offset error adjustment to null unwanted DC output signals. The DC gain of the instrumentation amplifier is first increased by reducing the internal...
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4488144 |
High linearity digital to analog converter
A digital-to-analog converter having high linearity about zero utilizes a magnitude/sign input code and comprises in combination a single unipolar digital-to-analog converter, a broad bandwidth,...
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4484145 |
Pulse width modulated power amplifier
A pulse width modulated power amplifier has a power section containing a transformer (T) with four windings. The windings (L 1 , L 2 ) on the battery side are each connected by their end points to...
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4476438 |
Multiplier circuit including amplifier with drift compensation circuit
An amplifier circuit comprising an amplifier (1) having an input (11) which receives an electric signal comprising an intermittent useful signal component V U and an undesired spurious component V...
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4463272 |
Automatic drift correction
Drift in the zero or datum reference point of a circuit (such as that forming part of a measuring device) is corrected by sensing the rate of change of the signal provided by the circuit and...
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4456390 |
Noncontact temperature measuring device
A portable, battery operated noncontact temperature measuring device including a lens for collecting infrared radiation and a thermopile for producing a signal indicative of the intensity thereof....
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4455534 |
Multi-state control circuitry
Multi-state control circuitry is described that can selectively couple an input signal to the positive and negative inputs of an operational amplifier depending on the voltage of a control signal....
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