Title :
A single-path multi-bit DAC for LP ΔΣ A/D converters
Author :
Roberts, Gordon W. ; Louis, Loai
Author_Institution :
Dept. of Electr. Eng., McGill Univ., Montreal, Que., Canada
Abstract :
A multi-bit DAC based on encoding DC levels in bitstreams is introduced. The DAC converts the multi-bit digital value into bitstreams which are then filtered by an analog filter to extract the DC levels encoded therein. With this approach, one analog path is used for all levels, thus reducing mismatch effects. A prototype IC has been fabricated in a 0.8 μm BiCMOS process incorporating the DAC in a 2nd-order Switched-Capacitor (SC) LP ΔΣ modulator
Keywords :
BiCMOS integrated circuits; digital-analogue conversion; low-pass filters; sigma-delta modulation; switched capacitor filters; 0.8 micron; BiCMOS IC; DC level; LP ΔΣ A/D converter; analog filter; bitstream encoding; mismatch effect; single-path multi-bit DAC; switched-capacitor modulator; BiCMOS integrated circuits; Digital filters; Digital modulation; Encoding; Linearity; Matched filters; Noise level; Noise reduction; Prototypes; Quantization;
Conference_Titel :
Circuits and Systems, 1998. ISCAS '98. Proceedings of the 1998 IEEE International Symposium on
Conference_Location :
Monterey, CA
Print_ISBN :
0-7803-4455-3
DOI :
10.1109/ISCAS.1998.704441
