Modulators – Pulse or interrupted continuous wave modulator – Pulse width modulator
Patent
1991-04-25
1992-06-02
Pascal, Robert J.
Modulators
Pulse or interrupted continuous wave modulator
Pulse width modulator
331 57, 375 22, H03K 700
Patent
active
051190451
ABSTRACT:
A pulse width modulation circuit comprising a voltage control type oscillator composed of a ring oscillator which comprises a plurality of delay elements and generates a plurality of output signals having different phases respectively. The PWM circuit further comprises a tap selection circuit for selecting one signal having a phase closest to that of a specific detect signal from the output signals of the oscillator. The PWM circuit further comprises a phase shift circuit for generating a plurality of delay signals having different phases shifted by a regular time in order in response to the selection signal output from the tap selection circuit. The PWM circuit further comprises a waveform shaping circuit for forming a plurality of pulse signals having different pulse widtsh respectively from the delay signals output from the phase shift circuit. And the PWM circuit further comprises a waveform selection circuit for selecting one desired pulse signal from the signals output from the waveform shaping circuit.
REFERENCES:
patent: 3805192 (1974-04-01), Ocraschek et al.
patent: 4524335 (1985-06-01), Yokoyama
patent: 4658225 (1987-04-01), Dukes et al.
Pascal Robert J.
Ricoh & Company, Ltd.
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