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:
Jan. 17, 1989
Filed:
Mar. 03, 1987
Ronald J Melanson, Sunnyvale, CA (US);
Ji L Yang, Palo Alto, CA (US);
Digital Equipment Corporation, Mayanard, MA (US);
Abstract
A semiconductor buffer circuit and buffering method for driving capacitive loads that enhances the current sinking and sourcing drive characteristics at times when the input signal is changing. Two transistors are used, a source follower and a current source pull-down, with an input signal applied to the control input of the source follower transistor. The complement of the input signal is capacitively coupled to the control input of the current source pull-down transistor. As a result, changes in the input voltage increase or decrease the conductivity of the current source pull-down transistor, thereby allowing the capacitive load to be charged and discharged more efficiently.