Output circuit capable of driving a vibration device

Details Output circuit capable of driving a vibration device Output circuit capable of driving a vibration device

1994-01-21

1995-02-07

Mullins, James B.

Amplifiers

Modulator-demodulator-type amplifier

330251, 381 684, 381120, H03F 338

Patent

active

053878752

ABSTRACT:
In an output circuit for pulse width modulation of an input signal and output of it to a predetermined vibrating section, power consumption is remarkably reduced with a comparatively simple configuration. The output circuit with a comparatively simple configuration which can drive a vibrating section at high efficiency without consuming unnecessary power can be realized by providing a polarity inverter circuit which inverts the polarity of an input signal and outputs it as an inverted input signal, comparing the instantaneous level of the input signal with that of the output signal from an oscillator circuit by a first comparator circuit, comparing the instantaneous level of the inverted input signal with that of an output signal from the oscillator circuit by a second comparator circuit, and thereafter, forming a drive signal based on the first and second comparison results and sending it to a drive section, thus obtaining the formation of a drive signal having a duty ratio corresponding to the instantaneous amplitude of the input signal.

REFERENCES:
patent: 3629616 (1971-12-01), Walker
patent: 4240036 (1980-12-01), Kohler
patent: 5014016 (1991-05-01), Anderson
Technological Report "An Output Amplifier Whose Time Has Come" by Elmer V. Carlson, Hearing Instruments, vol. 39, No. 10, 1988.

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