Bandpass Sigma–Delta Modulator Employing SAW Resonator as Loop Filter

Continuous-time bandpass (BP) sigma-delta modulators (SigmaDeltaMs) employing surface acoustic wave (SAW) resonators as loop filters are presented. Compared with the loop filters realized with Gm-C and LC resonators, the SAW resonator has the advantage of high-Q factor, wide resonant frequency range and accurate resonant frequency without the need for automatic tuning. With the proposed anti-resonance cancellation and loop filter phase compensation techniques, a second- and a fourth-order BP SigmaDeltaMs are demonstrated in a 0.35-mum CMOS technology. Both modulators are tested with 47.3-MHz off-chip SAW resonators. The second-order modulator attains a dynamic range of 57 dB and peak signal-to-noise distortion ratio (SNDR) of 54 dB and the fourth-order one achieves a dynamic range of 69 dB and peak SNDR of 66 dB, both in a 200-kHz signal bandwidth. The fourth-order modulator is also measured in a 3.84-MHz signal bandwidth and achieves a dynamic range of 52.5 dB and peak SNDR of 50 dB, an effective 8-bit resolution

[1]  P. Mole,et al.  A 200-MHz IF 11-bit fourth-order bandpass /spl Delta//spl Sigma/ ADC in SiGe , 2000, IEEE Journal of Solid-State Circuits.

[2]  W. Snelgrove,et al.  Design and implementation of a tunable 40 MHz-70 MHz Gm-C bandpass /spl Delta//spl Sigma/ modulator , 1997 .

[3]  Rui Yu,et al.  A 47.3-MHz SAW resonator based CMOS second-order bandpass sigma-delta modulator with 54-dB peak SNDR , 2005, Proceedings of the IEEE 2005 Custom Integrated Circuits Conference, 2005..

[4]  F. Maloberti,et al.  A 30-mW 10.7-MHz pseudo-N-path sigma-delta band-pass modulator , 1996, 1996 Symposium on VLSI Circuits. Digest of Technical Papers.

[5]  Omid Shoaei,et al.  A multi-feedback design for LC bandpass delta-sigma modulators , 1995, Proceedings of ISCAS'95 - International Symposium on Circuits and Systems.

[6]  J. M. Khoury,et al.  A 400-Ms/s frequency translating bandpass sigma-delta modulator , 1999, IEEE J. Solid State Circuits.

[7]  Shen-Iuan Liu,et al.  A 1-V 10.7-MHz fourth-order bandpass /spl Delta//spl Sigma/ modulators using two switched op amps , 2004 .

[8]  B.A. Wooley,et al.  A two-path bandpass /spl Sigma//spl Delta/ modulator for digital IF extraction at 20 MHz , 1997, 1997 IEEE International Solids-State Circuits Conference. Digest of Technical Papers.

[9]  R. J. van de Plassche,et al.  A sixth-order continuous-time bandpass sigma-delta modulator for digital radio IF , 1999, IEEE J. Solid State Circuits.

[10]  W. M. Snelgrove,et al.  A 160-MHz fourth-order double-sampled SC bandpass sigma-delta modulator , 1998 .

[11]  Bruce A. Wooley,et al.  A two-path bandpass ΣΔ modulator for digital IF extraction at 20 MHz , 1997 .

[12]  A. Sedra,et al.  Quadrature bandpass /spl Delta//spl Sigma/ modulation for digital radio , 1997 .

[13]  Weinan Gao,et al.  A 4 GHz fourth-order SiGe HBT band pass /spl Delta//spl Sigma/ modulator , 1998, 1998 Symposium on VLSI Circuits. Digest of Technical Papers (Cat. No.98CH36215).

[14]  H. Tao,et al.  Analysis of timing jitter in bandpass sigma-delta modulators , 1999 .

[15]  V.S.L. Cheung,et al.  A 3.3-V 240-MS/s CMOS bandpass /spl Sigma//spl Delta/ modulator using a fast-settling double-sampling SC filter , 2004, 2004 Symposium on VLSI Circuits. Digest of Technical Papers (IEEE Cat. No.04CH37525).

[16]  Gabor C. Temes,et al.  Understanding Delta-Sigma Data Converters , 2004 .

[17]  Gordon W. Roberts,et al.  Conversion in Digital Radio , 1998 .

[18]  V.S.L. Cheung,et al.  A 1 V 10.7 MHz switched-opamp bandpass /spl Sigma//spl Delta/ modulator using doublesampling finite-gain-compensation technique , 2001, 2001 IEEE International Solid-State Circuits Conference. Digest of Technical Papers. ISSCC (Cat. No.01CH37177).

[19]  Shen-Iuan Liu,et al.  MHz Fourth-Order Bandpass Modulators Using Two Switched Opamps , 2009 .

[20]  Andrea Baschirotto,et al.  A 3.3-V CMOS 10.7-MHz sixth-order bandpass ΣΔ modulator with 74-dB dynamic range , 2001 .

[21]  Howard C. Luong,et al.  A 70-MHz continuous-time CMOS band-pass /spl Sigma//spl Delta/ modulator for GSM receivers , 2000, 2000 IEEE International Symposium on Circuits and Systems. Emerging Technologies for the 21st Century. Proceedings (IEEE Cat No.00CH36353).

[22]  Gordon W. Roberts,et al.  An Eight-order Bandpass /spl delta/ /spl sigma/l Modulator For A/D Conversion In Digital Radio , 1998 .

[23]  Floyd M. Gardner,et al.  A Transformation for Digital Simulation of Analog Filters , 1986, IEEE Trans. Commun..

[24]  Bram Nauta,et al.  Linear CMOS transconductance element for VHF filters , 1989 .

[25]  Saska Lindfors,et al.  80-MHz bandpass /spl Delta//spl Sigma/ modulators for multimode digital IF receivers , 2003 .

[26]  William Martin Snelgrove,et al.  Switched-capacitor bandpass delta-sigma A/D modulation at 10.7 MHz , 1995, IEEE J. Solid State Circuits.

[27]  C.H. Fields,et al.  IF-sampling fourth-order bandpass /spl Delta//spl Sigma/ modulator for digital receiver applications , 2004, IEEE Journal of Solid-State Circuits.

[28]  William Martin Snelgrove,et al.  A 950-MHz IF second-order integrated LC bandpass delta-sigma modulator , 1998 .

[29]  A. Sedra,et al.  Quadrature bandpass ΔΣ modulation for digital radio , 1997, IEEE J. Solid State Circuits.

[30]  A. Hairapetian,et al.  An 81 MHz IF receiver in CMOS , 1996, 1996 IEEE International Solid-State Circuits Conference. Digest of TEchnical Papers, ISSCC.