Operational amplifier circuit

Details Operational amplifier circuit Operational amplifier circuit

1979-06-22

1981-09-01

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330294, H03F 345

Patent

active

042874793

ABSTRACT:
An operational amplifier circuit having a first amplification stage that includes a differential pair of matches, low-noise transistors coupled in a common-emitter configuration, with a special reactive network in the emitter circuit of each transistor. Each reactive network comprises an inductor and a resistor, arranged in a shunt configuration, whereby at low frequencies the first stage has a relatively high gain and generates relatively low noise, and whereby at high frequencies the first stage has a relatively low gain and the amplifier circuit has sufficient phase margin to ensure stability.

REFERENCES:
patent: 3368157 (1968-02-01), Fumea, Jr. et al.
patent: 3628168 (1971-12-01), Kobayashi
patent: 3811016 (1974-05-01), Takasaki et al.
Chessman, "Prevent Emitter-Follower Oscillation", Electronic Design 13, Jun. 21, 1976, pp. 110-113.

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