Final bridge stage for a receiver audio amplifier

Details Final bridge stage for a receiver audio amplifier Final bridge stage for a receiver audio amplifier

1982-08-13

1985-02-26

Mullins, James B.

Amplifiers

Wheatstone bridge with amplifier in at least one arm

330252, 330263, 381120, H03F 3183, H03F 345

Patent

active

045020167

ABSTRACT:
A final bridge stage for a receiver audio amplifier, which can be monolithically integrated, consists of two pairs of complementary bipolar transistors. The collectors of the transistors of each of the transistor pairs are connected together to form two terminals to which a transducer is connected. The transistor emitters of NPN type and PNP type transistors are respectively connected to the negative pole and, through a constant current generator, to the positive pole of a supply voltage generator. The constant current generator consists of a small resistor to which a constant voltage is applied by means of a suitable circuit. The bases of the bridge transistors are connected to the signal source by means of suitable circuits. The signal source controls similar transistors in phase opposition, while at the same time controlling the complementary transistors in phase opposition.

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