Bias circuit for use in a single-ended push-pull circuit

Details Bias circuit for use in a single-ended push-pull circuit Bias circuit for use in a single-ended push-pull circuit

1980-09-29

1983-08-30

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

H03F 330

Patent

active

044019513

ABSTRACT:
A bias circuit for use in the single-ended push-pull circuit has NPN and PNP transistors whose emitters are connected to each other and whose collectors provide a bias voltage, diodes and resistance elements. On the operating side, the diode gives a reference voltage and the resistance element detects the voltage corresponding to the increase of the output voltage exceeding the reference voltage. Simultaneously, on the unoperating side, the diode decreases the voltage between its both terminals. Thus the bias voltage is made larger, by positive feedback operation on the operating side and by negative feedback operation on the unoperating side, enough to prevent output power transistor on the unoperating side from being cut off.

REFERENCES:
patent: 3995228 (1976-11-01), Pass
patent: 4254379 (1981-03-01), Kawanabe
patent: 4274059 (1981-06-01), Okabe

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