Pulse-width modulation circuit with carrier signal frequency con

Details Pulse-width modulation circuit with carrier signal frequency con Pulse-width modulation circuit with carrier signal frequency con

1983-03-10

1985-06-18

Laroche, Eugene R.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

375 22, 330 10, H03K 708

Patent

active

045243352

ABSTRACT:
A pulse-width modulation circuit detects a signal level or amplitude of an audio signal by means of an absolute value detecting circuit. The detected level is applied to a control terminal of a voltage-controlled oscillator. The output of the voltage-controlled oscillator is used as a carrier signal of the pulse-width modulation circuit, and the frequency thereof is controlled in such a manner that the carrier frequency is lowered as the audio signal level increases. Higher order harmonics of the pulse-width-modulated output signal both at high and low modulation factors are made substantially the same in amount. Thus, a band width required for the circuit is remarkedly narrowed, and improvement in distortion factor can be attained regardless of a low cost to manufacture.

REFERENCES:
patent: 3506920 (1970-04-01), Swanson
patent: 3585517 (1971-06-01), Herbert
patent: 4178556 (1979-12-01), Attwood
P. H. Pazov, "Pulse Modulator Provides Switched-Mode Amplification", Nov. 6, 1980, Electronics, vol. 53, No. 24, p. 131.

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