Balanced, high-speed differential input stage for Op-amps

Details Balanced, high-speed differential input stage for Op-amps Balanced, high-speed differential input stage for Op-amps

1993-10-21

1994-12-20

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330310, 330255, 330257, H03F 345

Patent

active

053748972

ABSTRACT:
A differential input circuit has two halves, each half includes a differential input voltage terminal with a first emitter follower having its base terminal connected to the input terminal, having a collector terminal connected to a first voltage terminal, an emitter terminal connected to a first terminal of an emitter resistor. A second emitter follower is provided having has its base terminal connected to the first differential input terminal, having a collector terminal connected to the first voltage terminal, and having an emitter terminal. A diode-connected transistor is provided having an emitter terminal connected to the emitter terminal of the second emitter follower, having its base and collector terminals connected together. A current source is provided having an output terminal connected to the base and collector terminals of the first diode-connected transistor, and having an input terminal connected to a second voltage terminal. An output drive transistor is provided having its base terminal connected to the base and collector terminals of the first diode-connected transistor, having its emitter terminal connected to the first terminal of the emitter resistor, and having a collector terminal for providing a differential output current.

REFERENCES:
patent: 4901031 (1990-02-01), Kalthoff

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