Serial-parallel analog-to-digital converter using voltage level

Details Serial-parallel analog-to-digital converter using voltage level Serial-parallel analog-to-digital converter using voltage level

1977-06-17

1980-08-19

Sloyan, Thomas J.

Communications: electrical

Audible indication

Percussion-type sound producer

340347M, H03K 13175

Patent

active

042186757

ABSTRACT:
An analog-to-digital converter includes a first and a second comparator. The first comparator generates a plurality of quantizing outputs defining voltage gaps and also has first and second reference current outputs whose magnitudes are representative of which voltage gap encompasses the analog input voltage and a third reference current output whose magnitude is representative of the voltage gap width. A first encoder receives the quantizing outputs of the first comparator and generates a binary number which represents which of the voltage gaps the analog input voltage is encompassed by. The reference current outputs of the first comparator are input to a reference voltage level shifting circuit whose shifted reference output voltage is provided as an input to a second comparator which compares the analog input with a plurality of internal reference voltages which form a second continuous range of voltage gaps. The second comparator has a plurality of outputs, one corresponding to each of the voltage gaps encompassed by the reference voltages in the second comparator. A second encoder receives as inputs the outputs of the second comparator and generates a binary output which represents the least significant bit group of the analog input voltage.

REFERENCES:
patent: 3585631 (1971-06-01), McCown
patent: 3597761 (1971-08-01), Fraschilla et al.
patent: 3646548 (1972-02-01), Van Doren
patent: 3737894 (1973-06-01), Poretti
patent: 3846786 (1974-11-01), Brown et al.
patent: 3860952 (1975-01-01), Tallent et al.
patent: 4064506 (1977-12-01), Cartwright
The Engineering Staff of Analog Devices, Inc., ANALOG-DIGITAL CONVERSION HANDBOOK, 1972, pp. III-9 & III-10.

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