Comparator with a predetermined output state in dropout

Details Comparator with a predetermined output state in dropout Comparator with a predetermined output state in dropout

1996-04-23

1997-07-15

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

327307, 327563, H03K 522, H03L 500

Patent

active

056487355

ABSTRACT:
A comparator combines unbalanced differential input amplifiers to produce a balanced input stage that forces the comparator output to a predetermined state whenever the first differential amplifier enters dropout. The comparator's second differential amplifier is imbalanced to overcome the variable offset voltage which creates the comparator's hysteresis voltage. Its first differential amplifier is imbalanced to compensate for the imbalance of the second amplifier, thereby producing an input stage which is balanced overall and free of input offset voltages that would otherwise be present.

REFERENCES:
patent: 4272728 (1981-06-01), Wittlinger
patent: 4336502 (1982-06-01), Goto
patent: 4587444 (1986-05-01), Emori et al.
patent: 5047665 (1991-09-01), Burt
patent: 5530444 (1996-06-01), Tice et al.
Paul Horowitz, Winfield Hill, The Art of Electronics, Cambridge University Press, New York, 1989, pp. 229-231, 355-368.

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