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:
Aug. 10, 1993
Filed:
Apr. 01, 1992
Applicant:
Inventors:
Michael Cooperman, Framingham, MA (US);
Phillip Andrade, Lexington, MA (US);
Assignee:
GTE Laboratories Incorporated, Waltham, MA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03K / ;
U.S. Cl.
CPC ...
307443 ; 307475 ; 307265 ; 3072968 ;
Abstract
Electrical circuitry for changing the operating voltage conditions of CMOS inverter circuitry so as to shift its threshold voltage in a direction to cause the duty cycle of the output signals to equal the duty cycle of the input signals. An average filtered DC output voltage from the inverter circuitry is used as a control signal to a variable voltage supply which changes the operating voltages, thus shifting the threshold level of the inverter circuitry.