D/A converter

Details D/A converter D/A converter

1983-09-15

1986-04-08

Miska, Vit W.

Communications: electrical

Audible indication

Percussion-type sound producer

H03K 1302

Patent

active

045816000

ABSTRACT:
A D/A converter comprises one or both of a first D/A converter and a second D/A converter. In the first D/A converter, n (n.gtoreq.2) semiconductor devices are connected in parallel to each other between a power supply and a load resistor, gates of (n-1) semiconductor devices (called a first group of semiconductor devices) of the n semiconductor devices are connected to a common gate bias potential source, those semiconductor devices of the first group of semiconductor devices which are equal in number to the number determined by a content of high order bits of an input digital data are turned on to supply a current to the load resistor, and a voltage drop across the load resistor is outputted as an analog quantity representing the high order bits. In the second D/A converter, a gate voltage determined by a content of low order bits of the input digital data is supplied to a gate of the remaining one (called a second semiconductor device) of the n semiconductor device to supply a current to the load resistor, and a voltage drop across the load resistor is outputted as an analog quantity representing the low order bits.

REFERENCES:
patent: 2991422 (1961-07-01), Yaeger
patent: 3217147 (1965-11-01), Chapman, Jr.
patent: 4055773 (1977-10-01), Schoeff
patent: 4338592 (1982-07-01), Wilensky
patent: 4450433 (1984-05-01), Moritama
patent: 4503421 (1985-03-01), Hakeyama et al.

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