Input bias adjustment circuit for amplifier

Details Input bias adjustment circuit for amplifier Input bias adjustment circuit for amplifier

1981-09-22

1984-05-29

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330257, H03F 345

Patent

active

044518005

ABSTRACT:
In feedback type amplifier including a differential transistor pair, the bias current to at least one of the differential transistors is provided by a source of current proportional to the DC currents through the differential pair, a first transistor connected in series with the current source and having its base coupled to the base of a second opposite conductivity type transistor so that both will conduct the same current, and a further transistor of the opposite conductivity type which is connected in series with the second transistor and provides its base current to one of the differential transistors.

REFERENCES:
G. A. Hellwarth et al., "Ultrahigh Resistance Current Source and Differential Cascade Amplifier Application", IBM Technical Disclosure Bulletin, vol. 16, No. 7, Dec. 1973.

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