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:
Jun. 01, 1982
Filed:
Apr. 07, 1980
Ellis K Cave, Garland, TX (US);
Banc-By-Phone Corporation, Bannockburn, IL (US);
Abstract
An automatic gain control circuit wherein the gain progressively increases in increasingly larger magnitudes. The illustrative embodiment includes an amplifier whose gain is related by a voltage follower to the voltage on a capacitor in a feedback loop. A rectifier develops a signal representing the AGC output level which is compared against a threshold value. A current source, arranged in a further feedback loop with the capacitor and the voltage follower, increases the voltage on the capacitor as a function of that voltage. The second derivative with respect to time of such function is non-negative. To ensure that there exists a voltage on the capacitor upon which the current source can operate, a starting circuit provides a small, non-zero voltage to the capacitor.