Low distortion drive amplifier

Details Low distortion drive amplifier Low distortion drive amplifier

1988-06-06

1990-01-02

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including particular biasing arrangement

330292, 330311, H03F 114

Patent

active

048916072

ABSTRACT:
The low distortion drive amplifier of the present invention uses an emitter follower circuit to drive a low impedance load such as a transmission line. A constant current source is connected to the emitter terminal of the emitter follower transistor to provide a constant current through the emitter of the emitter follower circuit. Compensation circuitry is provided to offset any load current that is diverted from the emitter follower circuit to the load thereby insuring a constant current through the emitter of the emitter follower transistor. In this fashion, even with a low impedance load, a constant gain and a relatively constant output impedance can be obtained for this amplifier circuit thereby providing a low distortion drive circuit for the low impedance load such as a transmission line.

REFERENCES:
patent: 4153883 (1979-05-01), Taylor et al.

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