Modulators – Pulse or interrupted continuous wave modulator – Pulse width modulator
Patent
1998-04-28
1999-11-30
Mis, David
Modulators
Pulse or interrupted continuous wave modulator
Pulse width modulator
375238, 327175, H03K 708
Patent
active
059949732
ABSTRACT:
Disclosed is a PWM driver in which, when no signal is input, a PWM pulse wave is not output so as to thereby reduce a power to be consumed and a high output level can be obtained even by the use of a single-polarity power source. Also, provided is a PWM driver capable of changing an output amplitude by a simple circuit. For this purpose, a PWM driving apparatus for supplying a power proportional to an input signal to a load by outputting a PWM pulse wave whose duty cycle is changed in proportion to the input signal, comprises: a PWM modulator for outputting a first PWM pulse having a pulse width proportional to an absolute value of the input signal in a predetermined cycle; an inverting amplifier for outputting a second PWM pulse having a polarity opposite to the polarity of the first PWM pulse; switch means for outputting the first PWM pulse or the second PWM pulse in response to the polarity of the input signal; and an amplifier for outputting the PWM pulse wave in response to an output pulse of the switch means.
REFERENCES:
patent: 3715649 (1973-02-01), Ravas
patent: 4882664 (1989-11-01), Pennington
patent: 4914396 (1990-04-01), Berthiaume
patent: 4931713 (1990-06-01), Matjukhina et al.
Mis David
NEC Corporation
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