Pulse-width modulation amplifier

Details Pulse-width modulation amplifier Pulse-width modulation amplifier

1992-03-09

1993-11-16

Mullins, James B.

Amplifiers

Modulator-demodulator-type amplifier

330251, H03F 338

Patent

active

052627330

ABSTRACT:
A pulse-width modulation amplifier includes a triangular signal oscillator for generating a triangular carrier signal. A voltage comparator compares an input analog signal and the triangular carrier signal, and converts the input analog signal into a corresponding pulse-width modulation signal. A power amplifier serves to amplify the pulse-width modulation signal. A low pass filter removes carrier components from an output signal of the power amplifier, and generates a demodulated signal corresponding to the input analog signal. The amplitude of the triangular carrier signal is controlled in response to a power supply voltage fed to the power amplifier so that the amplitude of the triangular carrier signal will be substantially proportional to the power supply voltage.

REFERENCES:
patent: 3956716 (1976-05-01), Hamada
patent: 4737731 (1988-04-01), Swanson et al.
David W. Yeaple, "Hewlett-Packard's New HCTL-1000 Simplifies Closed Loop Motion Control Designs", Wescon 86/Conference Record, Nov. 18-20, 1986, Los Angeles, Calif., U.S.A., pp. 1, 4-8.

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