Apparatus for converting a DC or analog signal to a digital sign

Details Apparatus for converting a DC or analog signal to a digital sign Apparatus for converting a DC or analog signal to a digital sign

1978-03-07

1980-06-24

Miller, Charles D.

Communications: electrical

Audible indication

Percussion-type sound producer

340347AD, 73362AR, H03K 1302

Patent

active

042097746

ABSTRACT:
Apparatus for converting a dc or analog signal from, for example, a resistance type temperature detector, includes an analog to digital converter which has zero temperature drift. This is achieved by the use of two identical successive approximation digital to analog converters with an external comparator connected to both converters at the same time. By switching, one converter is used to provide zero compensation the other converter being inactive except for utilizing it as the path for the amplifier drift current; then with the switch in its other phase the other converter is activated to convert the analog signal to digital format taking into account the previously computed drift signal.

REFERENCES:
patent: 3027079 (1962-03-01), Fletcher
patent: 3145376 (1964-08-01), Currie
patent: 3877307 (1975-04-01), Georgi
Hnatek, "A User's Handbook of D/A and A/D Converters", Jun. 1976, p. 299.

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