Class A complementary single-ended push-pull amplifier

Details Class A complementary single-ended push-pull amplifier Class A complementary single-ended push-pull amplifier

1981-07-01

1983-05-17

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

330265, H03F 330

Patent

active

043842615

ABSTRACT:
In a complementary single-ended push-pull amplifier in which emitters of first and second complementary bipolar output transistors are connected through first and second emitter resistors to a load such as a loudspeaker, third and fourth complementary bipolar transistors are connected in series between the bases of the first and second bipolar transistors having their emitters connected to a bias voltage source for operating the first and second output transistors in the Class A mode. The bases of third and fourth transistors are respectively connected to the emitters of the first and second transistors, whereby a negative feedback is provided from the emitters of the first and second transistors to the bases thereof. With this arrangement, the sum of the collector currents of the first and second transistors is kept substantially constant and hence distortion of an output current (difference between the collector currents of the output transistors) fed to the load at large signal levels can be improved.

REFERENCES:
patent: 3536958 (1970-10-01), Sondermeyer

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