Differential amplifier circuit

Details Differential amplifier circuit Differential amplifier circuit

1978-10-25

1981-04-21

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330255, 330259, 330260, 330261, H03F 345

Patent

active

RE0305871

ABSTRACT:
The transistors of a differential amplifier are coupled at their common emitter electrode connection to a low voltage power supply terminal and at their collector electrodes through respective current sinks to a point of reference potential. The collector electrodes are maintained at a voltage level above the reference potential to permit input signal swings at the base electrodes of the transistors a comparable amount below the reference voltage level. Current sources are provided for satisfying that portion of the current demand of these sinks not furnished by the transistors. When the amplifier is connected to operate as a voltage follower, additional transistors may be provided to prevent an undesirable change in the polarity of the output signal, when the input signal swings substantially below the reference voltage level.

REFERENCES:
patent: 3541465 (1970-11-01), Nagata et al.
patent: 3644838 (1972-02-01), Graf
patent: 3649926 (1972-03-01), Hill
patent: 3894290 (1975-07-01), Schoeff

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