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On-line Access: 2011-06-07

Received: 2010-07-05

Revision Accepted: 2010-11-16

Crosschecked: 2011-05-05

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Journal of Zhejiang University SCIENCE C 2011 Vol.12 No.6 P.486-498

http://doi.org/10.1631/jzus.C1000239


A 20 μW 95 dB dynamic range 4th-order Delta-Sigma modulator with novel power efficient operational transconductance amplifier and resonator


Author(s):  Jian Xu, Xiao-bo Wu, Meng-lian Zhao, Jun-yi Shen

Affiliation(s):  Institute of VLSI Design, Zhejiang University, Hangzhou 310027, China

Corresponding email(s):   xujian@vlsi.zju.edu.cn, wuxb@vlsi.zju.edu.cn, zhaoml@vlsi.zju.edu.cn

Key Words:  Low power, High performance, Power efficient OTA and resonator, Delta-Sigma modulator


Jian Xu, Xiao-bo Wu, Meng-lian Zhao, Jun-yi Shen. A 20 μW 95 dB dynamic range 4th-order Delta-Sigma modulator with novel power efficient operational transconductance amplifier and resonator[J]. Journal of Zhejiang University Science C, 2011, 12(6): 486-498.

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author="Jian Xu, Xiao-bo Wu, Meng-lian Zhao, Jun-yi Shen",
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pages="486-498",
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publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.C1000239"
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%T A 20 μW 95 dB dynamic range 4th-order Delta-Sigma modulator with novel power efficient operational transconductance amplifier and resonator
%A Jian Xu
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%A Meng-lian Zhao
%A Jun-yi Shen
%J Journal of Zhejiang University SCIENCE C
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%P 486-498
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%I Zhejiang University Press & Springer
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TY - JOUR
T1 - A 20 μW 95 dB dynamic range 4th-order Delta-Sigma modulator with novel power efficient operational transconductance amplifier and resonator
A1 - Jian Xu
A1 - Xiao-bo Wu
A1 - Meng-lian Zhao
A1 - Jun-yi Shen
J0 - Journal of Zhejiang University Science C
VL - 12
IS - 6
SP - 486
EP - 498
%@ 1869-1951
Y1 - 2011
PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.C1000239


Abstract: 
A low power high performance delta-Sigma modulator for portable measurement applications is presented. To reduce power consumption while maintaining high performance, a fully feedforward architecture with a comprehensive system-level design is implemented. As a key building block, a novel power efficient current mirror operational transconductance amplifier (OTA) with a fast-settling less-error switched-capacitor common-mode feedback (SC CMFB) circuit is introduced, and the effects of both gain nonlinearity and 1/f noise of OTA are discussed. A new method to determine the voltage gain of an OTA is also proposed. The bottom terminal parasitic effect of poly-insulator-poly (PIP) capacitors is considered. About an extra 20% of capacitance is added to the total capacitance load. A power and area efficient resonator is adopted to realize a coefficient of 1/90 for 50% power and 75% area reduction compared with conventional designs. The chip is implemented in a low cost 0.35 μm complementary metal oxide semiconductor (CMOS) process. The total power consumption is 20 μW with a 1.5 V supply, and the measured dynamic range (DR) is 95 dB over a 1 kHz bandwidth. Experimental results show that a high figure-of-merit (FOM) is achieved for the designed modulator in comparison with those from the literature.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

Reference

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