D/A and A/D converters

Details D/A and A/D converters D/A and A/D converters

1997-11-12

1999-11-30

Tokar, Michael

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341143, H03M 166

Patent

active

059950315

ABSTRACT:
A multi-bit D/A converter which improves the linearity of an analog output relative to a digital input is provided. A switch control circuit (1) turns on D some of a plurality of switches (S1 to SM) which are arranged in ascending order starting with a switch determined by a start position determination circuit (3) and turns off the remaining switches, the number of switches turned on being dependent on a digital signal (DIG). The start position determination circuit (3) sequentially changes the switches (S1, S3, S5, . . . ) serving as a selection start position to determine the selection start position for each input of the digital signal (DIG) provided in synchronism with a clock signal (CLK).

REFERENCES:
patent: 5036322 (1991-07-01), Barrow et al.
patent: 5293166 (1994-03-01), Ta
patent: 5406283 (1995-04-01), Leung
patent: 5726652 (1998-03-01), Giuroiu
patent: 5760726 (1998-06-01), Koifman et al.
patent: 5856799 (1999-01-01), Hamasaki et al.
Rex T. Baird et al., "Linearity Enhancement of Multibit .DELTA..SIGMA. A/D and D/A Converters Using Data Weighted Averaging," IEEE Transactions on Circuits and Systems--II: Analog and Digital Signal Processing, vol. 42, No. 12, Dec. 1995, pp. 753-762.

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