Comparator with a large input voltage excursion

Details Comparator with a large input voltage excursion Comparator with a large input voltage excursion

1998-04-09

2000-09-26

Pascal, Robert

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330261, H03F 345

Patent

active

061247596

ABSTRACT:
The present invention relates to a BICMOS technology comparator including: a first stage with differential inputs capable of operating with input voltages which are, in the common mode, lower than a positive supply potential minus a first threshold voltage, the first stage controlling a first bipolar output transistor; a second stage with differential inputs for operating with input voltages which are, in the common mode, higher than a negative supply potential plus a second threshold voltage, the second stage controlling a second bipolar output transistor and the output transistors being connected in series between two terminals at the positive and negative supply potentials, and a midpoint of their series connection forming an output terminal of the comparator; and circuitry for controlling the differential stages according to the voltages applied on their inputs.

REFERENCES:
patent: 4728900 (1988-03-01), Nakagawara et al.
patent: 5142244 (1992-08-01), Glica et al.
patent: 5210506 (1993-05-01), Koch et al.
patent: 5337008 (1994-08-01), Badval
patent: 5337009 (1994-08-01), Koch et al.
patent: 5371474 (1994-12-01), Wassenaar et al.
patent: 5670910 (1997-09-01), Kato
patent: 5751186 (1998-05-01), Nakao
French Search Report from French Patent Application 97 04912, filed Apr. 15, 1997.

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