Push-pull power amplifying circuit

Details Push-pull power amplifying circuit Push-pull power amplifying circuit

1991-08-29

1992-11-03

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

H03F 330

Patent

active

051608979

ABSTRACT:
The present invention provides a B class push-pull amplifying circuit suitable for use in a headphone type tape recorder and the like. The amplifying circuit utilizes a current mirror circuit system in its output transistors to provide an idling current for compensating for crossover distortion by using the mirror ratio. The current mirror circuit system includes a pair of output current mirror circuits complimentarily coupled with each other. One branch of these output current mirror circuits includes a diode-connected transistor, the emitter current path of which is ON-OFF controlled by a drive transistor in the other branch. Thus, when no signal is input, the respective one of the current mirror output circuits complimentarily coupled with each other functions as a current mirror circuit such that the small idling current determined by the mirror ratio will pass therethrough. On the other hand, the inputting of a signal causes the output of the opposite side drive transistor to make the current mirror circuit inoperative. The output transistor functions as a normal amplifying circuit. An amplification factor h.sub.FE provided at this time can reliably assure a sufficiently large amplification degree.

REFERENCES:
patent: 4316149 (1982-02-01), Yamaguchi
patent: 4833424 (1989-05-01), Wright

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