Pulse-width modulator circuit

Details Pulse-width modulator circuit Pulse-width modulator circuit

1980-02-13

1982-06-29

Mullins, James B.

Amplifiers

Modulator-demodulator-type amplifier

H03F 338

Patent

active

043374387

ABSTRACT:
A pulse-width modulator circuit includes a pulse-width modulator which has an input for a low-frequency modulation signal and an input for a carrier signal, a carrier signal generator which has an output connected to the carrier signal input of the pulse-width modulator for providing a carrier frequency, a buffer stage postcoupled to the pulse-width modulator, an output filter postcoupled to the pulse-width modulator, including a relatively narrow-band resonant circuit for damping the carrier frequency, and a regulating device forming a feedback path between the resonant circuit and the carrier signal generator for maintaining the carrier frequency substantially at the resonance frequency of the resonant circuit.

REFERENCES:
patent: 3781634 (1973-12-01), Jessee
patent: 4021745 (1977-05-01), Suzuki et al.
Chudobiak et al., "Frequency and Power Limitations of Class-D Transistor Amplifiers", IEEE Journal of Solid-State Circuits, vol. SC-4, No. 1, Feb. 1969, pp. 25, 34, 35.

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