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. 23, 1993
Filed:
Jan. 15, 1991
Kit M Cham, Cupertino, CA (US);
Robert E Gleason, Jr, San Carlos, CA (US);
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
A novel BICMOS output buffer is taught including circuit means for firstly discharging the bases of the bipolar pull up and bipolar pull down transistors, and secondly to connect the base of an output transistor to its emitter when that output transistor is conducting, thereby insuring maximum voltage swing of the output voltage. The circuit means comprises an MOS transistor for discharging the base of an output transistor, and a depletion mode MOS transistor for connecting the base of an output transistor to its emitter. By utilizing MOS and depletion mode transistors, a significant area advantage is achieved, particularly when the MOS and depletion mode transistors are merged.