Low voltage class B amplifier with low value decoupling capacito

Details Low voltage class B amplifier with low value decoupling capacito Low voltage class B amplifier with low value decoupling capacito

1986-06-25

1988-01-12

LaRoche, Eugene R.

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

330255, H03F 326, H03F 345

Patent

active

047194308

ABSTRACT:
A class B push-pull integrated circuit suitable for low voltage operation, having two symmetrical halves. Each half circuit has first and second opposite conductivity type transistors having their collectors connected together to the base of a class B driver transistor, the collector of which drives the base of an output transistor. An AC input signal is divided into in-phase and anti-phase components one of which is applied to the base of each first transistor. An AC feedback loop extends from the collector of the fourth transistor through a voltage divider and level shifter to the base of the second transistor. A DC feedback loop extends from the base of the fourth transistor through a fifth transistor to the base of the second transistor. Decoupling capacitors extend from the bases of the fifth transistors and through a diode to ground. The arrangement allows use of small decoupling capacitors, and a current forced through the diode eliminates turn-on delay.

REFERENCES:
patent: 4476442 (1984-10-01), Iwamatsu

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