Binarily weighted pulse width digital-to-analog converter

Details Binarily weighted pulse width digital-to-analog converter Binarily weighted pulse width digital-to-analog converter

1985-11-25

1987-01-13

Sloyan, T. J.

Communications: electrical

Audible indication

Percussion-type sound producer

340347CC, 340347M, 377 42, 377 52, 364757, H03K 1302

Patent

active

046367730

ABSTRACT:
A digital-to-analog converter system for converting a digital input signal having parallel words, each word including multi-bit groups of weighted significance, and which is provided at an input word rate of W Hz, is disclosed. The digital-to-analog converter system (10, 100, 200) includes pulse generating circuitry (11, 13, 111, 113, 211, 213) responsive to a first multi-bit group and a second multi-bit group of the digital input words for providing (a) a first pulse modulated signal as a function of the value of the first multi-bit group and (b) a second pulse modulated signal as a function of the value of the second multi-bit group; weighting elements (15, 19, 115, 119, 215, 219) for weighting the first and second pulse modulated signals as a function of the relative weighted significance of the first and second multi-bit groups; and output circuitry (20, 120, 220) for summing and filtering the weighted signals to provide an analog output signal that is representative of the digital input signal.

REFERENCES:
patent: 3823396 (1974-07-01), Lode
patent: 4016558 (1977-04-01), Bishop et al.
The Engineering Staff of Analog Devices, Inc., Analog-Digital Conversion Handbook, 6/1972, pp. II-16 to II-27.

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