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:
Jul. 17, 1990
Filed:
Mar. 21, 1989
LuVerne R Peterson, San Diego, CA (US);
Unisys Corporation, Blue Bell, PA (US);
Abstract
A digital translator, on a semiconductor chip that contains N-channel transistors and P-channel transistors which have threshold voltages that vary about respective nominal values, includes an input/output module which is made of the transistors and which receives a digital input signal at two voltage levels and in response generates a digital output signal at two different voltage levels. To compensate for the threshold variations and thereby stabilize the voltage levels of the output signal, the translator also includes a voltage generator which produces a reference voltage for the input/output module. This generator is made of the N-channel transistors and the P-channel transistors, and it varies the reference voltage in proportion to the threshold voltage of the N-channel transistors regardless of how the threshold voltage of the P-channel transistors varies; and, the input/output module includes one of the N-channel transistors which receives the reference voltage and produces the output signal by conducting in proportion to the reference voltage only when the input signal is at one of its two voltage levels.