Capacitive analog to digital converter

Details Capacitive analog to digital converter Capacitive analog to digital converter

1978-07-26

1980-01-22

Sloyan, Thomas J.

Communications: electrical

Audible indication

Percussion-type sound producer

340347M, H03K 1309

Patent

active

041852753

ABSTRACT:
The disclosed analog to digital converter employs a single signal propagation path thereby necessitating only one holding capacitor (101) per stage (STAGE 1) of coding. The first terminal (B) of each holding capacitor (101) is connected to a reference voltage (L1) such as a resistive divider (106, 116, 126, 136, 146, 150, 151, V.sub.HI) which has binary weighted taps (L1-L5). The other terminal (A) of each holding capacitor (101) is connected to the analog signal input (INPUT). The reference voltage (L1) and the analog sample (V1) are compared and, for a zero decision, the stored analog sample (V1) is directly passed on to the subsequent stage (STAGE 2) by a buffer circuit (102). For a one decision, the aforementioned first terminal (B) of the holding capacitor (101) is switched from the tap of the resistive divider to circuit ground thereby subtracting that binary weight (L1) from the signal (V1) stored on the holding capacitor (101). When the subtraction operation is complete, the remaining signal (V1-L1) is passed through the buffer circuit (102) to the subsequent stage (STAGE 2).

REFERENCES:
patent: 3449741 (1969-06-01), Egerton
patent: 3626408 (1971-12-01), Carbrey
patent: 4129863 (1978-12-01), Gray et al.
The Engineering Staff of Analog Devices, Inc., Analog-Digital Conversion Handbook, 1972, pp. II-46 to 48; III-78, 79.

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