论文信息 - Reducing harmonic distortion components of a second-order sigma-delta modulator by using a compensated OTA

Reducing harmonic distortion components of a second-order sigma-delta modulator by using a compensated OTA

The performances of second-order sigma-delta modulators implemented with typical folded-cascade operational transconductance amplifiers (OTA) and compensated OTAs are compared. The power consumption and silicon area are the same for both structures and the noise is almost at the same level. It is shown by simulations that the harmonic distortion components are reduced, around -7 dB, when the compensated OTA is employed.

J. Silva-Martinez | C. Garibay-Lua

[1] H. S. Fetterman,et al. A 14-bit 80-kHz sigma-delta A/D converter: modeling, design and performance evaluation , 1989 .

[2] Bernhard E. Boser,et al. The Design of Sigma-Delta Modulation Analog-to-Digit a 1 Converters , 2004 .

[3] Bruce A. Wooley,et al. A 50-MHz multibit sigma-delta modulator for 12-b 2-MHz A/D conversion , 1991 .

[4] José Luis Huertas,et al. Modeling opamp-induced harmonic distortion for switched-capacitor /spl Sigma//spl Delta/ modulator design , 1994, Proceedings of IEEE International Symposium on Circuits and Systems - ISCAS '94.

[5] Monson H. Hayes,et al. Statistical Digital Signal Processing and Modeling , 1996 .

[6] Rinaldo Castello,et al. Performance limitations in switched-capacitor filters , 1985 .

[7] J. Silva-Martinez,et al. Improving the high-frequency response of the folded-cascode amplifiers , 1996, 1996 IEEE International Symposium on Circuits and Systems. Circuits and Systems Connecting the World. ISCAS 96.