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:
Sep. 20, 1983
Filed:
Mar. 27, 1981
Tom L Blackburn, San Jose, CA (US);
GTE Automatic Electric Incorporated, Northlake, IL (US);
Abstract
A DC control current is developed in a first transistor circuit and the control current is responsive to a control voltage which is proportional to the output voltage of a fixed gain amplifier. A reference voltage is applied to a second transistor which provides the normal operating bias for said fixed gain amplifier, and, also, provides a variable impedance via the diode circuit of the base-emitter junction. This diode circuit is a part of a variolossor that also includes a resistor which is connected in the series path between the signal source and the fixed gain amplifier. The bias voltage of the second transistor does not change but the diode impedance varies as the control voltage varies so as to maintain the amplifier output constant.