A/D Self-testing circuit

Details A/D Self-testing circuit A/D Self-testing circuit

1984-08-27

1986-07-08

Hix, L. T.

Communications: electrical

Audible indication

Percussion-type sound producer

340347CC, H03M 110

Patent

active

045996040

ABSTRACT:
An A/D system having a capacitive DAC is provided with a circuit for accurately testing the functionality of the A/D system. An accurate reference voltage which is associated with A/D systems is utilized directly by selectively coupling the accurate reference voltage to predetermined ones of a plurality of rank ordered capacitors forming a binarily weighted DAC via a plurality of switches. After charging the predetermined capacitors, an effective test voltage results which is then coupled by the switches to successive approximation circuitry associated with the A/D system. A resulting digital output code may be compared with the weighted analog value of the switched reference voltage to test whether the circuitry of the A/D system is functioning properly.

REFERENCES:
patent: 4399426 (1983-08-01), Tan
patent: 4412208 (1983-10-01), Akazawa et al.
patent: 4415882 (1983-11-01), Akazawa et al.
patent: 4451821 (1984-05-01), Domogalla

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