Switched-capacitor bandpass delta-sigma A/D modulation at 10.7 MHz

Two second-order bandpass delta-sigma A/D modulators have been implemented in a 0.8 /spl mu/ BiCMOS process to demonstrate the feasibility of converting a 10.7 MHz radio IF signal to digital form. The circuits, based on switched-capacitor biquads, demonstrated 57 dB SNR in a 200 kHz bandwidth when clocked at 42.8 MHz, dissipating 60 mW from a 5 V supply. The two modulators use different clocking strategies to allow evaluation of a tradeoff between active and passive sensitivities. >

[1]  Hiroshi Inose,et al.  A unity bit coding method by negative feedback , 1963 .

[2]  Kenneth W. Martin,et al.  Effects of the op amp finite gain and bandwidth on the performance of switched-capacitor filters , 1981 .

[3]  F. Montecchi.  Time-shared switched-capacitor ladder filters insensitive to parasitic effects , 1984 .

[4]  M. A. Copeland,et al.  Biquad alternatives for high-frequency switched-capacitor filters , 1985 .

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

[6]  Richard Schreier,et al.  Bandpass sigma-delta modulation , 1989 .

[7]  B. Song.  A 10.7-MHz switched-capacitor bandpass filter , 1989 .

[8]  R. Gray,et al.  Dithering and its effects on sigma delta and multi-stage sigma delta modulation , 1990, IEEE International Symposium on Circuits and Systems.

[9]  T. H. Pearce,et al.  Bandpass implementation of the sigma-delta A-D conversion technique , 1991 .

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

[11]  Leon O. Chua,et al.  The effect of integrator leak in Sigma - Delta modulation , 1991 .

[12]  Wu Chou,et al.  Dithering and its effects on sigma-delta and multistage sigma-delta modulation , 1991, IEEE Trans. Inf. Theory.

[13]  B. Tait,et al.  A Sub-Micron BiCMOS Technology for Telecommunications , 1991, ESSDERC '91: 21st European Solid State Device Research Conference.

[14]  Stephen H. Lewis,et al.  A 10-b 20-Msample/s analog-to-digital converter , 1992 .

[15]  David J. Goodman,et al.  Wireless Communications: Future Directions , 1993 .

[16]  L. Longo,et al.  A 15 b 30 kHz bandpass sigma-delta modulator , 1993, 1993 IEEE International Solid-State Circuits Conference Digest of Technical Papers.

[17]  L. Longo.  A 15b 30kHz bandpass sigma-delta modulator , 1993 .

[18]  A. Wedel,et al.  An interpolative bandpass converter on a 1.2- mu m BiCMOS analog/digital array , 1993 .

[19]  S. Jantzi,et al.  A fourth-order bandpass sigma-delta modulator , 1993 .

[20]  Omid Shoaei,et al.  Optimal (bandpass) continuous-time /spl Sigma//spl Delta/ modulator , 1994, Proceedings of IEEE International Symposium on Circuits and Systems - ISCAS '94.

[21]  G. Temes.  Delta-sigma data converters , 1994 .

[22]  C. D. Thompson,et al.  A digitally-corrected 20b delta-sigma modulator , 1994, Proceedings of IEEE International Solid-State Circuits Conference - ISSCC '94.

[23]  Bruce A. Wooley,et al.  A low-power, area-efficient digital filter for decimation and interpolation , 1994, IEEE J. Solid State Circuits.

[24]  W. Snelgrove,et al.  Optimal (Bandpass) Continuous-Time Sigma-Delta Modulator. , 1994 .