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The Design of CIFF Structure Three-Order Switched-Capacitor Sigma-Delta Modulator

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Abstract:

This paper presents the design and implementation of a single-loop three-order switched-capacitor sigma-delta modulator(SDM) with a standard 0.18um CMOS technology. A current optimization technique is utilized in proposed design to reduce the power of operational transconductance amplifier(OTA).Using a chain of Integrators with weighted feed-forward summation(CIFF) structure and optimized single-stage class-A OTA with positive feed-back to minimize the power consumption. The SDM has been presented with an over-sampling ratio of 128,clock frequency 6.144MHz,24kHz band- width, and achieves a peak SNR of 100dB,103dB dynamic range. The whole circuits consume 2.87mW from a single 1.8V supply voltage.

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Periodical:

Advanced Materials Research (Volumes 433-440)

Pages:

5727-5732

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.433-440.5727

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Cite this paper

Online since:

January 2012

Authors:

Jun Han, Wei Dong Wang

Keywords:

Analog-Digital Conversion, Operational Transconductance Amplifier (OTA), Sigma-Delta Modulator (SDM), Switched-Capacitor Circuits

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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