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Comparison of OpAmp based and comparator based switched capacitor filter

Sahoo, Manodipan and Amrutur, Bharadwaj (2012) Comparison of OpAmp based and comparator based switched capacitor filter. In: Proceedings of the 16th International Symposium VDAT 2012, July 1-4, 2012, Shibpur, India.

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Official URL: http://dx.doi.org/10.1007/978-3-642-31494-0_21


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 1 st 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.

Item Type: Conference Paper
Publisher: IEEE
Additional Information: Copyright of this article belongs to IEEE.
Keywords: Switched Capacitor Circuits; Sampled Data Systems; Virtual ground; Comparator Based Switched Capacitor(CBSC) Filter; Miller Compensation
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited: 18 Dec 2013 09:55
Last Modified: 18 Dec 2013 09:58
URI: http://eprints.iisc.ac.in/id/eprint/48022

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