The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 12, 1983
Filed:
Jul. 06, 1981
Ronald R Jones, Phoenix, AZ (US);
Circuit Research Labs, Tempe, AZ (US);
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.