Voltage controlled resistor

A resistor has a resistance which is precisely controlled by means of a voltage control circuit. The controlled resistor is a radiation sensitive device which is optically coupled to a source of radiation connected to the output of an operational amplifier. A control circuit applies a controllable (...

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Bibliographische Detailangaben
Hauptverfasser:	ANDERSEN, ROBERT D
Format:	Patent
Sprache:	eng
Schlagworte:	BASIC ELECTRONIC CIRCUITRY CONTROL OF AMPLIFICATION ELECTRICITY GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS RESONATORS TECHNICAL SUBJECTS COVERED BY FORMER USPC TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ARTCOLLECTIONS [XRACs] AND DIGESTS
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Beschreibung
Zusammenfassung:	A resistor has a resistance which is precisely controlled by means of a voltage control circuit. The controlled resistor is a radiation sensitive device which is optically coupled to a source of radiation connected to the output of an operational amplifier. A control circuit applies a controllable (preferably programmable) voltage, functionally related to a desired resistance of the controlled resistor, to the input of the operational amplifier. Also connected to the input of the operational amplifier is a feedback radiation sensitive resistor, which is also optically coupled to the radiation source. Preferably, the controlled radiation sensitive resistor and the feedback radiation sensitive resistor have substantially identical resistance characteristics. A compensation circuit is electrically connected between the input and output of the operational amplifier. The compensation circuit substantially eliminates cyclical variations in the resistance of the controlled resistor caused by a response lag between the radiation source control and the radiation sensitive resistors.