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4066919 |
Sample and hold circuit
An electronic circuit suitable to be fabricated in monolithic integrated circuit form for producing at an output terminal an output signal for a predetermined time period of which the value thereof...
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4053797 |
Receive amplifier for PAM signals
A decoded PAM input signal is coupled through a first polarity switch (which for one polarity of a polarity signal is closed) to the positive input line of a differential operational amplifier and...
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4048574 |
Method and a device for eliminating the residual error voltage of an amplifier
The connections between the two inputs of an amplifier and the two outputs of a signal source as well as between the outputs of the amplifier and the inputs of a downstream output element into...
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4042885 |
Zeroing circuit
A zeroing circuit for use in conjunction with devices that produce output signals in response to input data signals feeds a compensating signal into such a device to produce a zero output signal...
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4039963 |
Stabilizer for the base level of an amplifier
The output of an amplification assembly is coupled with the input of an integrating circuit by means of a first controlled switch. The output of the integrating circuit is coupled with the input of...
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4032856 |
Drift compensated amplifier, particularly for measuring signals
A gas analyzer has an output amplifier circuit which is drift compensated in that zero volts are established across a gain network for a particular low point measuring signal as the amplifier...
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4025869 |
Solid state amplifier
An amplifier capable of operation in four modes singly or in combinations is disclosed. The modes are: DC amplification mode, AC amplification mode, suppressed baseline mode, and offset correction...
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4010424 |
Phase-sensitive detector circuit with compensation for offset error
A phase-sensitive detector circuit comprises a pair of field-effect transistors switched in antiphase and connected at a switching point. The switching point is supplied with a signal to be...
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4006428 |
Amplifier circuit having integral means for detecting and preventing non-linear operation
An amplifier circuit including provision for detecting non-linear circuit operation caused by the application of input signals that exceed either the amplifier dynamic range or the amplifier...
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3995227 |
Analog signal sample amplifiers
A recirculatory analog signal sample amplifier having at least a first prtermined gain is provided with error determining means for recirculating a zero input signal with a second predetermined...
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3988689 |
Offset corrected amplifier
A circuit for cancelling the offset voltage of a signal amplifier includes a second amplifier and a third amplifier connected to the outputs of the signal amplifier and the second amplifier. A...
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3982196 |
Differential voltage amplifier
A differential voltage amplifier having high gain and a wide bandwidth essentially comprises an unstable circuit having one position of unstable equilibrium and two distinct positions of...
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3978399 |
Integrating fluxmeter with input current compensation to cancel drift
The integrating fluxmeter disclosed herein employs a second electronic integrator which operates during the intervals between test periods to adjust a compensating bias current, applied to the main...
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3970923 |
Apparatus for measuring sheet resistivity of semiconductor materials and diffused layers
A device for measuring sheet resistivity of semiconductor materials and diffused layers uses a linear four-point probe having pneumatically-actuated contact pins coupled to a self-zeroing voltage...
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3940759 |
Analog signal processing system with correction for amplifier offset
Low level analog signals from remote locations are amplified after being converted into two consecutive analog signals of opposite polarities and a digital system causes A/D conversion to occur in...
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3936819 |
Amplifier for analogue signal samples with automatic gain control, and circuit for digitisation of such samples
An electronic device for amplifying, with automatic gain control by discr values, analogue signal samples and thereafter preferably effecting analogue-to-digital conversion of the samples, consists...
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RE28579 |
Integrating network using at least one D-C amplifier
An integrating network for performing integration of an input voltage by the use of an integrator comprising time-constant means and a d-c amplifier, wherein a drift memory circuit is provided...
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3908173 |
Differential amplifying system with forced differential feedback
A differential amplifying system including a differential input, differential output first stage coupled to a differential input, single ended output second stage with forced differential feedback...
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3875523 |
AMPLIFIER CIRCUIT FOR GRAPHICAL RECORDER
In a recording or measuring instrument such as an x-y chart recorder, an amplifying circuit reduces the current flow into and out of circuit input terminals due to the presence of common mode...
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3836861 |
LOW DISSIPATION POWER AMPLIFIER
A push-pull amplifier utilizing substantially identical first and second transistors, the collector of the first transistor being directly coupled to the base of the second transistor, the base of...
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3832642 |
CURRENT MEASURING CIRCUIT AND METHOD
The current of a mass spectrometer collector is indicated by a circuit including an electrometer tube having a control grid connected to the collector. The electrometer tube is included in a d.c....
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3828204 |
SENSITIVE PULSE THRESHOLD DETECTOR
A sensitive pulse detector which in one embodiment incorporates a tunnel diode is disclosed. The tunnel diode prior to the application of a gate pulse of a selected duration during which an input...
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3825846 |
SIGNAL ISOLATOR HAVING FEEDBACK CONTROL
A control circuit is provided for electrically isolating an input circuit from an output circuit which is responsive to an input signal in the input circuit. A feedback signal indicative of the...
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3818246 |
SWITCHING CIRCUITS PARTICULARLY USEFUL FOR ANALOG-TO-DIGITAL CONVERTERS
Time delays associated with switching controls of analog-to-digital converter circuits permit switching transients to be blocked from reducing conversion accuracy. The time delays allow switching...
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3810031 |
INTEGRATED AMPLIFYING DEVICE HAVING LOW DRIFT AND METHOD OF COMPENSATING FOR THE DRIFT OF AN AMPLIFYING DEVICE
The device comprises n amplifying stages placed in cascade and each comprising means for storing a value substantially proportional to the offset voltage of each stage and compensating for the...
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3801919 |
NULL LOOP FOR CORRECTING LOW FREQUENCY ERROR SIGNALS IN HIGH PERFORMANCE AMPLIFIERS
A feedback null loop includes a low drift, first loop amplifier connected to the output of a fast settling, large drift amplifier means which is to be corrected for AC and DC errors due to stray...
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3793592 |
PHASE SENSITIVE DEMODULATOR
A phase sensitive demodulator achieves signal isolation without the use of transformer or other frequency sensitive component. A diode bridge which shunts the input signal is driven by the outputs...
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3783399 |
FULL-WAVE MOD ULATOR-DEMODULATOR AMPLIFIER APPARATUS
Full-wave modulator-demodulator apparatus including an operational amplifier having a first input terminal coupled to a circuit input terminal, and a second input terminal alternately coupled to...
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3778710 |
RANGING AMPLIFIER SYSTEMS
An auto ranging amplifier with automatic zero suppression which automatically adds a D.C. potential to an amplified input signal to keep a data trace within preestablished channel boundaries. A...
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3771038 |
DRIFT CORRECTING SERVO
This invention is an error correcting circuit to cancel the drift of a drifting electronic or electromechanical system by periodically sampling the output of the drifting electronic or...
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3768028 |
A.C.-D.C. AMPLIFIER SYSTEM
A wide-band a.c., stable d.c., amplifier system employing a wide-band operational amplifier and an integrator-feedback high-gain essentially d.c.-amplifying operational amplifier. The system...
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3760287 |
DIGITALLY CONTROLLABLE VARIABLE ACTIVE RC FILTER
The several transmission characteristics of an active RC filter are adjusted by digital control of passive networks included at particular points in the filter circuit. Each network includes a...
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3757239 |
DIRECT CURRENT AMPLIFIER DRIFT REDUCTION METHOD
Herein disclosed is a method of selecting the resistive and temperature co-efficient parameters of emitter resistors in the differential input transistor pair of a direct current amplifier. The...
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3757241 |
A.C. AMPLIFIER HAVING D.C. BIAS STABILIZATION
An A.C. amplifier is disclosed having first and second A.C. amplifier sections each including a high input impedance stage followed by an output stage, with the output stages of the two amplifier...
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3748587 |
CONTINUOUS AMPLIFIER ASSEMBLY WITH DRIFT CORRECTION
An amplifier assembly for amplifying weak DC signals and having means for ift correction. The assembly includes commutating devices for causing it to operate cyclicly in two distinct operating...
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3737794 |
VARIABLE GAIN AMPLIFIER SYSTEM
A serial-parallel analogue-to-digital converter system utilizes a conventional ADC having a relatively low number of channels together with at least one amplifier which may be set at different...
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3737798 |
VERY HIGH IMPEDANCE INPUT CIRCUIT
Disclosed circuit includes two series-connected operational amplifiers A 1 and A 2 inverter connected with resistive negative feedback so that their inputs are substantially and at least...
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3735274 |
THERMOCOUPLE SIGNAL AMPLIFIER
Apparatus for generating an amplified DC voltage signal that is (a) proportional to a DC voltage generated by a thermocouple, (b) of an amplitude determined by a feedback impedance, and (c)...
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3735288 |
PHASE MODULATOR
A phase or frequency modulator having an operational amplifier with inverting and noninverting terminals, an RC network wherein R is light responsive, a control signal for controlling the light...
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3721755 |
COLOR TELEVISION ENCODER MODULATOR
A balanced modulator circuit for use in television cameras to impress color information on the chrominance subcarrier wherein the video input is phase-split and the resulting signals are fed...
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3720846 |
INTEGRATING AMPLIFIER CIRCUITS
An integrating amplifier circuit is provided which overcomes the problem of input voltage offset and enables a cheaper amplifier to be employed in a given situation. Input circuits are disclosed...
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3718871 |
PHASE MODULATING DEVICE
A phase modulating device for an electronic musical instrument has at least one phase shifting means essentially composed of at least one resistive branch and at least one reactive branch. The...
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3714603 |
RC ACTIVE FILTER APPARATUS
A complex filter or filter section using an amplifier with a plurality of feedback loops which may be used for bandpass filtration or for filters requiring complex transmission zeros.
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3707684 |
ERROR AMPLIFIER FOR SWITCHING REGULATOR
A differential amplifier compares the voltage from a switching regulator with a constant voltage and provides an output current having a value which is determined by the voltage from the switching...
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3702970 |
SYSTEM AND METHOD FOR DETERMINING THE MAXIMUM OUTPUT VOLTAGE SWING ON OPERATIONAL AMPLIFIERS
An operational amplifier is rapidly driven through a voltage swing to a maximum value; that is, the excursion of the output voltage attains a maximum value with a prescribed difference between the...
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3699423 |
D. C. TO A.C. CONVERTER WITH UNIQUE FEEDBACK DEMODULATION
An D.C. to A.C. converter where the output A.C. signals which are 180 degrees apart are rectified in an integrated chopper and applied to a differential amplifier with the D.C. input in order to...
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3697891 |
BIDIRECTIONAL WAVEFORM GENERATOR WITH SWITCHABLE INPUT
A reactive impedance connected to the input of a feedback amplifier is alternately charged through a switch from a positive and negative voltage reference source. A resistive summing network...
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3694760 |
FEEDBACK SWITCHING CIRCUIT FOR ELIMINATING ERROR SIGNALS
Apparatus for eliminating error currents normally prevalent when an assoced operational amplifier is disconnected from its input source. A feedback arrangement comprising a field effect transistor...
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3691470 |
CHOPPER AMPLIFIER
A chopper amplifier is disclosed which is particularly applicable for use in conjunction with amplifying low level signals to higher level signals suitable for use with electrical measuring...
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3681703 |
LOW LEVEL DC AMPLIFIER WITH AUTOMATIC ZERO OFFSET ADJUSTMENT
A low level dc amplifier which amplifies low level signals and automatically adjusts the output signal thereof to eliminate the output offset voltage.
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