As CMOS technology shrinks, the transistor speed K-quantizing paths and can achieve significantly higher conversion bandwidths when compared to the traditional deltasigma ADCs. The 8-path KD1S modulator achieves an SNR of 58 dB (or 9.4-bits resolution) when clocked at 100 MHz for a conversion bandwidth of 6.25 MHz and an effective sampling rate equal to 800 MHz. The KD1S modulator has been fabricated in a 500 nm CMOS process and the experimental results are reported. Deficiencies in the first test chip performance are discussed along with their alleviation to achieve theoretical performance.
© 2009 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. DOI: 10.1109/MWSCAS.2009.5236069
Saxena, Vishal; Li, Kaijun; Zheng, Geng; and Baker, R. Jacob. (2009). "A K-Delta-1-Sigma Modulator for Wideband Analog to Digital Conversion". 52nd IEEE International Midwest Symposium on Circuits and Systems, 2009. MWSCAS '09, 411-414. http://dx.doi.org/10.1109/MWSCAS.2009.5236069