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:
Dec. 01, 1992
Filed:
Mar. 04, 1991
Motorola, Inc., Schaumburg, IL (US);
Abstract
A bias voltage generator (12) provides a bias control voltage that is connected to a gate of transistor (32) to sink a predetermined amount of bias current. The bias voltage generator (12) is also connected to a gate of a transistor (31) to limit the voltage to a selected bit-line within an array of flash EEPROM cells (26). The predetermined bias current is summed with the current from a selected flash EEPROM cell (46). A reference current generator portion (22), establishes both a reference current and a reference voltage at a second input to a differential amplifier (35). A current-voltage (I-V) characteristic curve of the reference voltage at the second input of the differential amplifier is approximately symmetrically located between the I-V characteristic curves of a flash EEPROM cell when the logic state of the flash EEPROM cell is in an erased state and a programmed state.