Digital-to-analog converter of the pulse width modulation type

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United States of America Patent

PATENT NO 4233591
SERIAL NO

05916565

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Abstract

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A digital-to-analog converter of a pulse width modulation type in which a single counting cycle of a clock pulse counter is divided into 2.sup.m elementary periods where m represents a selected number of less significant bits of a digital input data to be converted into analog quantity and elementary pulses in number determined in dependence on the logic values of the more significant bits are distributed among the elementary periods, while supplementary elementary pulses are produced in the elementary periods selected in dependence on the logic values of the less significant bits of the digital input data. These elementary pulses are integrated for every elementary period and the integrated output value is converted into a corresponding DC analog output signal.

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Patent Owner(s)

  • HITACHI, LTD.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Akutsu, Eisaku Yokohama, JP 12 148
Matsuura, Shigeo Yokohama, JP 16 144
Miyamoto, Hiroshi Yokohama, JP 165 1614
Murata, Toshinori Yokohama, JP 35 499

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