Power control circuit used for both analog/digital dual mode

Details Power control circuit used for both analog/digital dual mode Power control circuit used for both analog/digital dual mode

1991-11-08

1993-01-12

Mullins, James B.

Amplifiers

With control of power supply or bias voltage

With control of input electrode or gain control electrode bias

330134, 330138, 330144, 330279, 330284, 375 98, 455116, 455126, H03G 320

Patent

active

051793539

ABSTRACT:
A power control circuit used for both analog/digital dual mode is disclosed which comprises a switching circuit (17) for applying the feedback signal to the gain control terminal (40) of the power amplifier (2) and applying a fixed bias voltage to the attenuation control terminal (30) of the attenuator (10) so that the amplifier operates as a C class amplifier in the case of analog mode, and for applying the feedback signal to the attenuation control terminal (30) of the variable attenuator (10) and applying the predetermined bias voltage to the gain control terminal (40) of the power amplifier (2) so that the amplifier operates as an A class amplifier in the case of digital mode. In the present invention, as a single amplifier operates for both analog mode and digital mode, the configuration is simplified and assembled cheaply.

REFERENCES:
patent: 4518927 (1985-05-01), Koppe et al.
patent: 4523155 (1985-06-01), Walczak et al.

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