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:
Jun. 03, 1997
Filed:
Jun. 27, 1996
Francis Chan, Williston, VT (US);
Bijit T Patel, S. Burlington, VT (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
Disclosed is an improved push-pull off-chip driver circuit. The circuit includes a push-pull amplifier including a pull-up transistor and a pull-down transistor, each provided with independent inputs and connected at the output node. The input to the pull-up transistor is provided by a transmission gate having an n-channel transistor connected in parallel with a p-channel transistor. A control transistor is coupled between the output node and the gate of the pull-up transistor to provide a protective bias. A feedback override circuit is coupled between the output node and the gate of the p-channel transmission gate transistor to selectively provide either Vout or a low level potential to that gate. The feedback override circuit improves the response time and noise immunity of a prior art off-chip driver in the active mode in a manner consistent with the objectives of protecting the gate oxides from high voltage stress and prevent leakage currents during the high-impedance mode.