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:
Feb. 14, 1984
Filed:
Oct. 05, 1981
Dennis M Monticelli, Fremont, CA (US);
National Semiconductor Corporation, Santa Clara, CA (US);
Abstract
A trigger circuit with hysteresis is created by driving a latch circuit set and reset terminals through a pair of emitter driven complementary transistors the bases of which are returned to a reference potential V.sub.REF. The hysteresis is set by the V.sub.BE potentials of the complementary transistors. When the input emitters are driven more than one V.sub.BE above V.sub.REF, one transistor will conduct and set the latch. When the input falls below one V.sub.BE below V.sub.REF, the other transistor will conduct and reset the latch. A digital filter is created by coupling a capacitor across the trigger circuit input and digitally driving the capacitor through a transconductance amplifier.