Voltage controlled resistor

Details Voltage controlled resistor Voltage controlled resistor

1981-07-06

1983-07-12

Pellinen, A. D.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

307503, 330261, 363 73, G05F 146

Patent

active

043933467

ABSTRACT:
A voltage controlled resistor includes an operational transconductance amplifier (OTA) including first and second linearizing diodes which not only optimize signal-to-noise distortion levels but also represent the AC impedance from the inverting input to ground. The OTA turns on and off in response to the amount of gain control current being supplied thereto. A Darlington transistor is coupled to the output of the OTA for providing a low impedance buffered output. A first resistor provides current flow through the diodes. A feedback resistor supplies and controls bias current to one of the diodes. A third resistor maintains bias to the Darlington pair when the OTA output approaches open circuit output impedance conditions.

REFERENCES:
patent: 3536988 (1970-10-01), Boynton
patent: 3793480 (1974-02-01), Waehner
patent: 3849735 (1974-11-01), Haenen et al.

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