Comparison of opamp based and comparator based switched capacitor filter

Authors:
Manodipan Sahoo;Bharadwaj Amrutur
Affiliations:
School of VLSI Technology, Bengal Engineering and Science University, India;Department of Electrical Communication Engineering, IISc, Bangalore, India
Venue:
VDAT'12 Proceedings of the 16th international conference on Progress in VLSI Design and Test
Year:
2012

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Abstract

Comparator based switched capacitor circuits provide an excellent opportunity to design sampled data systems where the virtual ground condition is detected rather than being continuously forced with negative feedback in Opamp based circuits. This work is an application of this concept to design a 1st order 330 KHz cutoff frequency Lowpass filter operating at 10 MHz sampling frequency in 0.13μm technology and 1.2 V supply voltage. The Comparator Based Switched Capacitor (CBSC) filter is compared with conventional Two stage Miller compensated Operational amplifier based switched capacitor filter. It is shown that CBSC filter relaxes the constraints like speed ,linearity, gain, stability which would otherwise be hard to satisfy in scaled technologies in Opamp based circuits. The designed CBSC based lowpass filter provides significant power savings compared to traditional Opamp based switched capacitor filter.