Low distortion current feedback amplifier with dynamic biasing

Details Low distortion current feedback amplifier with dynamic biasing Low distortion current feedback amplifier with dynamic biasing

1997-11-18

1999-11-02

Pascal, Robert

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

330267, H03F 326

Patent

active

059778296

ABSTRACT:
A low distortion amplifier and method of reducing distortion in an amplifier at high output power in which energy dissipated while the amplifier is operating at low output power, is reduced. A bias circuit provides a quiescent bias current to the input stage of the amplifier for operating the amplifier without substantial distortion at low input signal levels and low output power. A sense transistor senses a current less than and proportional to an output current from the amplifier, and feeds back the sensed current to the input stage to augment the quiescent bias current when output power increases. When the output power decreases, the sensed current is removed in order to maintain the low power output bias currents.

REFERENCES:
patent: 4454479 (1984-06-01), Spires
patent: 4471322 (1984-09-01), Yamaguchi et al.

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