Amplifier with signal-dependent voltage supply source

Details Amplifier with signal-dependent voltage supply source Amplifier with signal-dependent voltage supply source

1982-10-25

1985-03-26

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including particular power supply circuitry

330263, H03F 321

Patent

active

045076197

ABSTRACT:
In a combination of an amplifier (2,5,6) and a signal-dependent voltage supply source (16-23) coupled thereto, a portion of the signal from a signal source (1) is applied by an amplifier (9) to a comparator (16), the output signal of which controls a limiter (20-21). A portion of the output signal thereof is applied as a feedback signal to a second input of the comparator (16) by means of a low-pass filter (22) and a feedback network (23) in series. The feedback loop thus formed is arranged so that it oscillates at a comparatively high frequency. A signal-dependent modulation of the pulse width and/or the pulse density then occurs at the limiter output. A supply voltage for the amplifier is derived from the output of the filter (22). Owing to the high feedback factor of the feedback loop at the signal frequencies the supply voltage can adequately follow the output signal of the amplifier independently of component tolerances and any load variations.

REFERENCES:
patent: 4054843 (1977-10-01), Hamada
patent: 4218660 (1980-08-01), Carver

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