Pulse width modulated, push/pull digital to analog converter

Details Pulse width modulated, push/pull digital to analog converter Pulse width modulated, push/pull digital to analog converter

1980-02-04

1982-01-12

Nusbaum, Mark E.

Communications: electrical

Audible indication

Percussion-type sound producer

1791SM, H03K 1302

Patent

active

043108318

ABSTRACT:
A pulse width modulated digital-to-analog converter for utilization in low voltage, integrated circuit speech synthesis circuitry. A digitally programmable shift register is utilized to generate a pulse, which is generally related to the magnitude of a digital signal. A programmable delay circuit provides finer resolution by converting the least significant digital bits of data into pulse width information of shorter duration than the minimum pulse width generated by the controllable shift register. Pulse width information generated by the shift register and delay circuit is applied to the bases of two crossconnected transistors to drive a speaker or voice coil.

REFERENCES:
patent: 3648275 (1972-03-01), Bower
patent: 3975587 (1976-08-01), Dunn et al.
H. Schmid, "Electronic A/D Conversions", Van Nostrand, 1970, Figure 7.4-2.

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