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:
Oct. 12, 1982
Filed:
Oct. 31, 1979
Michael Cooperman, Framingham, MA (US);
Christopher W Kapral, San Carlos, CA (US);
GTE Laboratories Incorporated, Waltham, MA (US);
Abstract
Multiplexor with internal decoding. Signal levels at two select input terminals select the data input at one of four data input terminals to be applied to an output terminal. The multiplexor includes three sets of pairs of transistors connected in a series arrangement. In one embodiment the current source for the transistors includes a resistance and diode in parallel connected between ground and the transistors of the third set and a resistance connected between a source of negative potential and the transistors of the first set. In another embodiment the current source includes a dual emitter transistor biased to operate as a constant current source connected between the source of negative potential and the transistors of the first set in place of the resistance.