A Low-Power Second-Order Two-Channel Time-Interleaved ΣΔ Modulator for Broadband Applications

Xiao YANG; Hong ZHANG; Guican CHEN

doi:10.1587/transele.E92.C.852

A Low-Power Second-Order Two-Channel Time-Interleaved ΣΔ Modulator for Broadband Applications

Xiao YANG, Hong ZHANG, Guican CHEN

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Time-interleaving is an efficient approach to increase the effective sampling rate of the ΣΔ modulators, but time-interleaved (TI) ΣΔ modulators are sensitive to channel mismatch, which causes the quantization noise folded back into the band of interest. To reduce the folded noise caused by the channel mismatch of two-channel TI ΣΔ modulators, a low-power second-order two-channel TI ΣΔ modulator is proposed. The noise transfer function (NTF) of the modulator is a band-pass filter. By using this band-pass NTF, the folded noised can be reduced. The entire modulator can be implemented by employing three op-amps, which is beneficial for power consumption. The circuit of implementation for the proposed modulator is designed in 0.18 µm COMS technology. The proposed modulator can achieve a SNDR of 78.9 dB with a channel mismatch of 0.5% and a linear gradient mismatch of 0.4% for unity sampling capacitors. Monte Carlo simulation is done with a random Gaussian mismatch of 0.4% standard deviation for all capacitors, resulting in an average SNDR of 80.5 dB. It is indicated that the proposed TI modulator is insensitive to the channel mismatch. The total power consumption is 19.5 mW from a 1.8 V supply.

Publication: IEICE TRANSACTIONS on Electronics Vol.E92-C No.6 pp.852-859

Publication Date: 2009/06/01

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Online ISSN: 1745-1353

DOI: 10.1587/transele.E92.C.852

Type of Manuscript: Special Section PAPER (Special Section on Analog Circuits and Related SoC Integration Technologies)

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Xiao YANG, Hong ZHANG, Guican CHEN, "A Low-Power Second-Order Two-Channel Time-Interleaved ΣΔ Modulator for Broadband Applications" in IEICE TRANSACTIONS on Electronics, vol. E92-C, no. 6, pp. 852-859, June 2009, doi: 10.1587/transele.E92.C.852.
Abstract: Time-interleaving is an efficient approach to increase the effective sampling rate of the ΣΔ modulators, but time-interleaved (TI) ΣΔ modulators are sensitive to channel mismatch, which causes the quantization noise folded back into the band of interest. To reduce the folded noise caused by the channel mismatch of two-channel TI ΣΔ modulators, a low-power second-order two-channel TI ΣΔ modulator is proposed. The noise transfer function (NTF) of the modulator is a band-pass filter. By using this band-pass NTF, the folded noised can be reduced. The entire modulator can be implemented by employing three op-amps, which is beneficial for power consumption. The circuit of implementation for the proposed modulator is designed in 0.18 µm COMS technology. The proposed modulator can achieve a SNDR of 78.9 dB with a channel mismatch of 0.5% and a linear gradient mismatch of 0.4% for unity sampling capacitors. Monte Carlo simulation is done with a random Gaussian mismatch of 0.4% standard deviation for all capacitors, resulting in an average SNDR of 80.5 dB. It is indicated that the proposed TI modulator is insensitive to the channel mismatch. The total power consumption is 19.5 mW from a 1.8 V supply.
URL: https://global.ieice.org/en_transactions/electronics/10.1587/transele.E92.C.852/_p

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@ARTICLE{e92-c_6_852,
author={Xiao YANG, Hong ZHANG, Guican CHEN, },
journal={IEICE TRANSACTIONS on Electronics},
title={A Low-Power Second-Order Two-Channel Time-Interleaved ΣΔ Modulator for Broadband Applications},
year={2009},
volume={E92-C},
number={6},
pages={852-859},
abstract={Time-interleaving is an efficient approach to increase the effective sampling rate of the ΣΔ modulators, but time-interleaved (TI) ΣΔ modulators are sensitive to channel mismatch, which causes the quantization noise folded back into the band of interest. To reduce the folded noise caused by the channel mismatch of two-channel TI ΣΔ modulators, a low-power second-order two-channel TI ΣΔ modulator is proposed. The noise transfer function (NTF) of the modulator is a band-pass filter. By using this band-pass NTF, the folded noised can be reduced. The entire modulator can be implemented by employing three op-amps, which is beneficial for power consumption. The circuit of implementation for the proposed modulator is designed in 0.18 µm COMS technology. The proposed modulator can achieve a SNDR of 78.9 dB with a channel mismatch of 0.5% and a linear gradient mismatch of 0.4% for unity sampling capacitors. Monte Carlo simulation is done with a random Gaussian mismatch of 0.4% standard deviation for all capacitors, resulting in an average SNDR of 80.5 dB. It is indicated that the proposed TI modulator is insensitive to the channel mismatch. The total power consumption is 19.5 mW from a 1.8 V supply.},
keywords={},
doi={10.1587/transele.E92.C.852},
ISSN={1745-1353},
month={June},}

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TY - JOUR
TI - A Low-Power Second-Order Two-Channel Time-Interleaved ΣΔ Modulator for Broadband Applications
T2 - IEICE TRANSACTIONS on Electronics
SP - 852
EP - 859
AU - Xiao YANG
AU - Hong ZHANG
AU - Guican CHEN
PY - 2009
DO - 10.1587/transele.E92.C.852
JO - IEICE TRANSACTIONS on Electronics
SN - 1745-1353
VL - E92-C
IS - 6
JA - IEICE TRANSACTIONS on Electronics
Y1 - June 2009
AB - Time-interleaving is an efficient approach to increase the effective sampling rate of the ΣΔ modulators, but time-interleaved (TI) ΣΔ modulators are sensitive to channel mismatch, which causes the quantization noise folded back into the band of interest. To reduce the folded noise caused by the channel mismatch of two-channel TI ΣΔ modulators, a low-power second-order two-channel TI ΣΔ modulator is proposed. The noise transfer function (NTF) of the modulator is a band-pass filter. By using this band-pass NTF, the folded noised can be reduced. The entire modulator can be implemented by employing three op-amps, which is beneficial for power consumption. The circuit of implementation for the proposed modulator is designed in 0.18 µm COMS technology. The proposed modulator can achieve a SNDR of 78.9 dB with a channel mismatch of 0.5% and a linear gradient mismatch of 0.4% for unity sampling capacitors. Monte Carlo simulation is done with a random Gaussian mismatch of 0.4% standard deviation for all capacitors, resulting in an average SNDR of 80.5 dB. It is indicated that the proposed TI modulator is insensitive to the channel mismatch. The total power consumption is 19.5 mW from a 1.8 V supply.
ER -