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:
Apr. 11, 1995
Filed:
Aug. 23, 1993
Chung K Chang, Sunnyvale, CA (US);
Johnny C Chen, Cupertino, CA (US);
Michael A Van Buskirk, San Jose, CA (US);
Lee E Cleveland, Santa Clara, CA (US);
Advanced Micro Devices, Inc., Sunnyvale, CA (US);
Abstract
A distributed negative gate power supply for generating and selectively supplying a relatively high negative voltage to control gates of memory cells in selected half-sectors via wordlines in an array of flash EEPROM memory cells during flash erasure. The distributed negative gate power supply includes a main charge pumping circuit (20a, 20b), a plurality of distribution sector pumping means (18a-18p). Each of the plurality of distribution sector pumping circuits is responsive to a half-sector select signal for selectively connecting the primary negative voltage to the wordlines of the selected half-sectors.