Gain control using PWM

Details Gain control using PWM Gain control using PWM

1994-08-30

1996-09-03

Chin, Stephen

Pulse or digital communications

Pulse width modulation

375345, 329312, H04B 346

Patent

active

055530966

ABSTRACT:
A gain control circuit utilizes a PWM having its transfer function characteristics determined by a ramp and a DC supply voltage. An input signal modulates the PWM and an integrating circuit at the output of the PWM recovers a replica of the input signal. Changing one or more of the transfer function characteristics of the PWM results in a change in the amplitude of the recovered replica of the input signal. Changing the ramp frequency may also be used to effect gain control. An arrangement in a television deflection circuit with raster correction is shown.

REFERENCES:
patent: 3535657 (1967-09-01), Carlson et al.
patent: 4280219 (1981-07-01), Lowenschuss et al.
patent: 4524335 (1985-06-01), Yokoyama
patent: 4549151 (1985-10-01), Kaneko

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