Analog-to-digital converter using prescribed signal components t

Details Analog-to-digital converter using prescribed signal components t Analog-to-digital converter using prescribed signal components t

1989-09-25

1991-03-12

Shoop, Jr., William M.

Coded data generation or conversion

Analog to or from digital conversion

Increasing converter resolution

341118, 341120, 341143, 341155, 341156, 341162, H03M 120

Patent

active

049996274

ABSTRACT:
An input analog signal having a prescribed component is coverted into an n bit digital signal using low resolution circuitry. An m>n bit digial signal representative of the prescribed component is generated from stored information and past samples of the digital output signal and transformed into a coarsely quanitized analog signal. The prescribed component representative analog signal is subtracted from the input analog signal to form a difference representative signal which is converted into an n-m bit digital signal and them bit digital signal is combined with the n-m bit difference representative signal to produce an n bit digtial signal corresponding to the input analog signal.

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Digital Communications, Published by McGraw Hill, 1983, by John G. Proakis, pp. 412-417.
Proceedings of the 1988 IEEE Custom Integrated Circuits Conference, Rochester, NY, May 1988, "A 13 Bit 160 KHz Sigam-Delta A/D Converter for ISDN", by S. R. Norsworthy and I. G. Post, pp. 21.3.1-21.3.4.
IEEE Transactions on Communications, vol. COM-33, No. 3, Mar. 1985, "A Use of Double Integration in Sigma-Delta Modulation", by James C. Candy, pp. 249-258.

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