Operational amplifier with increased settling speed

Details Operational amplifier with increased settling speed Operational amplifier with increased settling speed

1980-03-17

1982-07-27

Tokar, Michael J.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330260, H03F 345

Patent

active

043420036

ABSTRACT:
A compact, complementary metal-oxide on silicon integrated circuit operational amplifier (10, 70, 76) having a differential input stage and an output transistor (50) which has its bias current supplied by a complementary current source transistor (48) also includes filter means for coupling signals from the input stage to the gate (52) of the bias transistor (48). By these means, this normally relatively constant current is increased under certain signal conditions to increase the settling speed. In one form, the filter is a capacitor (64). In another form, it is a parallel combination of a capacitor (64) and a coupling transistor (72) in parallel. The capacitor (64) passes high frequencies, and the resistor (72) passes large amplitude signals. To prevent the signal coupling to the gate (52) from affecting other bias conditions in the circuit, the coupled portion of the gate is isolated from a bias control node (42) by a barrier device (66) which passes only D.C.

REFERENCES:
patent: 4078206 (1978-03-01), Crowle
patent: 4274058 (1981-06-01), Suzuki
patent: 4284957 (1981-08-01), Haque
Jacobs et al., "Touch-Tone Decoder Chip Mates Analog Filtering with Digital Logic, Electronics", vol. 52, No. 4, Feb. 15, 1979, pp. 105-112.

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