Amplifiers – With semiconductor amplifying device – Including push-pull amplifier
Patent
1993-05-27
1995-02-07
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including push-pull amplifier
330271, H03F 326
Patent
active
053878787
ABSTRACT:
An amplification circuit includes a push-pull type output circuit including first and second output transistors operating complimentarily connected in series between dc current source terminals, the bases of the first and second transistors being driven by a pre-stage output, a current detecting resistance inserted between either one of the first and second transistors and the dc current source terminals for detecting a bias current of the output circuit, an error amplification circuit for amplifying difference between voltage across the current detecting resistance and reference voltage and for negative-feedback controlling the bias current of the output circuit, and a diode connected in parallel to the current detecting resistance for bypassing a current flowing during outputting of a signal. The amplification circuit may further include a distortion reduction circuit for charging and holding the voltage across the current detecting resistance at its lowest state and thereby smoothing the output current of the error amplification circuit during outputting of a signal. A push-pull type amplification circuit in which deterioration in characteristics is not caused and adjustment of an idling current and temperature compensation are not required is thereby provided.
REFERENCES:
patent: 4922208 (1990-05-01), Susak et al.
Dudek James A.
Mullins James B.
Yamaha Corporation
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