Data converter for directly providing outputs in two's complemen

Details Data converter for directly providing outputs in two's complemen Data converter for directly providing outputs in two's complemen

1986-11-28

1988-12-13

Sloyan, T. J.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

307360, 307361, 341172, H03M 138

Patent

active

047914050

ABSTRACT:
A method for directly providing a conversion of an analog input signal to a digital signal in two's complement code with a sampled data converter. Positive and negative reference voltages and an analog ground voltage are required. After a sign bit determination of the input signal is made, the data converter is coupled between either a first pair of reference voltages or a second pair of reference voltages depending upon the sign bit. The first pair of reference voltages comprises the positive reference and ground reference, and the second pair of reference voltages comprises the ground reference and a negative reference. By selectively coupling the chosen reference voltages to the converter, a converter may directly output two's complement code.

REFERENCES:
patent: 3403393 (1968-09-01), Skrenes
patent: 4473818 (1984-09-01), Younquist
Gray et al., Companded Pulse-Code Modulation Voice Codec-, IEEE Journal of Solid-State Circuits, vol. SC-10, No. 6, 12/1975, pp. 497-499.
The Engineering Staff of Analog Devices, Inc., Analog-Digital Conversion Handbook, 6/1972, pp. II-16 to II-25; II-32 to II-35; & II-46 to II-49.
McCreary et al., All-Mos Charge Redistribution Analog-To-Digital-, IEEE Journal of Solid-State Circuits, vol. SC-10, No. 6, 12/1975, pp. 371-379.
Sklar, 2's Complement Arithmetic Operations, Computer Design, vol. 11, No. 5, 5/1972, pp. 115-121.

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