Direct-coupled amplifier circuit with DC output offset regulatio

Details Direct-coupled amplifier circuit with DC output offset regulatio Direct-coupled amplifier circuit with DC output offset regulatio

1979-12-04

1981-12-29

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330259, H03F 345

Patent

active

043085040

ABSTRACT:
A direct-coupled amplifier circuit includes an input stage differential amplifier comprised of a differential pair of field effect transistors and a pair of bipolar transistors connected in series with the differential field effect transistors, respectively and having their emitters coupled together. Gate electrodes of the differential field effect transistors are coupled to an input terminal and an output terminal of the amplifier circuit, respectively. The collector-to-emitter voltages of the bipolar transistors are controlled in accordance with the magnitude and polarity of an output DC offset voltage appearing on the output terminal so as to reduce the DC offset voltage.

REFERENCES:
patent: 3370242 (1968-02-01), Offner
patent: 3434069 (1969-03-01), Jones
patent: 3868583 (1975-02-01), Krabbe
patent: 3955149 (1976-05-01), Trilling

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