Title :
Mismatch cancellation for double-sampling sigma-delta modulators
Author :
Yu, Li ; Snelgrove, Martin
Author_Institution :
Dept. of Electron., Carleton Univ., Ottawa, Ont., Canada
Abstract :
The performance of double-sampling sigma-delta A/Ds can suffer due to capacitor mismatch as well as uneven clock phases. Improving the resulting SNR is essential. This paper presents a method that uses DSP techniques to filter out the mismatch. Simulation results of applying an adaptive LMS filter to a fourth-order double-sampling bandpass sigma delta modulator are presented that show an improvement in SNR of more than 30 dB
Keywords :
adaptive filters; least mean squares methods; sigma-delta modulation; A/D converter; DSP; SNR; adaptive LMS filter; capacitor mismatch cancellation; clock phase; double-sampling bandpass sigma delta modulator; simulation; Capacitors; Circuits; Clocks; Delta-sigma modulation; Digital signal processing; Filters; Frequency; Image sampling; Phase modulation; Sampling methods;
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.1998.704435
