Two-step switched-capacitor digital to analog converter

Details Two-step switched-capacitor digital to analog converter Two-step switched-capacitor digital to analog converter

1984-06-25

1986-04-22

Shoop, Jr., William M.

Communications: electrical

Audible indication

Percussion-type sound producer

340347M, H03M 100

Patent

active

045845689

ABSTRACT:
In accordance with the present invention, the circuitry of the ten bit switched capacitor digital to analog converter utilizes five binary weighted input capacitors and a digital circuit to perform multiplexing and generating the necessary timing. A combination of input capacitors and feedback capacitors give rise to an output voltage in an amount proportional to digital input bits in a binary fashion such that in the first step, the output voltage is proportional to the first five least significant bits divided by 32 and the second step the output voltage would be equal to the previous value plus a voltage proportional to the five most significant bits. Therefore, at the end of the second step, the output voltage is an analog voltage proportional to the binary input bits times the reference voltage divided by 1024.

REFERENCES:
patent: 4412208 (1983-10-01), Akazawa et al.
patent: 4451820 (1984-05-01), Kapral
patent: 4468654 (1984-08-01), Kapral
Yee, Terman and Heller, IEEE Journal of Solid State Circuits, Aug. 1979, vol. SC-4, No. 4, pp. 778-781.
Dooley, 1973 IEEE International Solid State Circuits Conference, Digest of Technical Papers, pp. 12-13.
Stellrecht and Kelson, 1973 IEEE International Solid State Circuits Conference, Digest of Technical Papers, pp. 16-17.

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