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:
Mar. 26, 1991
Filed:
Jun. 12, 1989
Vincent K Win, Milpitas, CA (US);
Andrew K Chan, Palo Alto, CA (US);
Advanced Micro Devices, Inc., Sunnyvale, CA (US);
Abstract
An adaptive reference voltage generation circuit. The invention generates a reference voltage for a sense amplifier to provide bias voltages for cells in a type programmable logic array. The circuit of the invention includes a reference cell having characteristics substantially similar to the cells of the array. A reference voltage supply circuit is included for providing a reference voltage in response to any changes in the characteristics of the reference cell. In accordance with the method of the invention, the reference cell is programmed and erased whenever the cells in the array are programmed and erased. Thus the characteristics of the reference cell change in accordance with changes in the characteristics of the cells of the array. As the reference voltage of the circuit of the present invention changes inversely with changes in the characteristics of the reference cell, the circuit of the invention effectively compensates for changes in the characteristics of the cells in the array due to program and erase cycling thereof.