Switched Capacitor A/D Converter Based on Butterworth Filter Implementation

Tsai, Ming-Shiung; Yi, Wei-Ling

ISBN 10: 3639001605 / ISBN 13: 9783639001600

Published by VDM Verlag Dr. Mueller E.K., 2008

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Bibliographic Details

• Title: Switched Capacitor A/D Converter Based on Butterworth Filter Implementation
• Publisher: VDM Verlag Dr. Mueller E.K.
• Publication Date: 2008
• Language: English
• ISBN 10: 3639001605
• ISBN 13: 9783639001600
• Binding: Soft cover
• Condition: New

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Synopsis

In this work, we present a fourth-order cascade-of-integrators feed-back Sigma-Delta A/D converter. We use Oversampling and Noise-Shaping techniques to earn a higher resolution than that in the Nyquist-Rate A/D converters. A generic method is presented to make the system stabilized. In order to fix the zeros and poles in the unit circle, we use MATLAB to design the Butterworth high pass filter, and then the coefficients could be obtained. We present a complete design flow to decrease the time of the design. By applying this method, a fourth-order Sigma-Delta A/D converter is implemented by TSMC 0.35 µm 2P4M Mixed-Signal Polycide process provided by National Chip Implementation Center. The circuit specification is as follows: the supply voltage is 3.3 V, the sampling rate is 256, the signal bandwidth is 20k Hz, the working frequency is 10.24Meg Hz, an SNR, 75.7dB is attained, and the total power consumption is 20.3 mW.