Bias current generator circuit for a sense amplifier

Details Bias current generator circuit for a sense amplifier Bias current generator circuit for a sense amplifier

1991-03-04

1992-12-01

Fears, Terrell W.

Static information storage and retrieval

Floating gate

Particular biasing

365218, 365900, G11C 1300

Patent

active

051684667

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.

REFERENCES:
patent: 5101379 (1992-03-01), Lin et al.

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