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:
Jan. 18, 1977
Filed:
Aug. 04, 1975
Douglas R Curtis, Sunnyvale, CA (US);
Other;
Abstract
An analog device for generating an output signal which is proportional to the linear product between a first input signal and the antilogarithm of the second input signal, and comprising a means for applying the second input signal simultaneously and identically across the base-emitter junction of two electrically matched transistors; a means for summing each differential component of the first input signal with the second input signal across one of the same base-emitter junctions is provided; and further including a means for differencing the signals developed in the collectors of the two transistors so that the output signal is comprised only of the desired product of the two input signals.