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.
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References
Moore, G.: Cramming more components on integrated circuits. Electronics 38(8) (April 1965)
Sansen, W., et al.: Towards Sub 1V Analog Integrated circuits in submicron standard CMOS technologies. In: IEEE Int. Solid State Circuits Conference, Dig. Tech. Papers, pp. 186–187 (February 1998)
Buss, D.: Device issues in the integration of analog/RF functions in deep submicron digital CMOS. IEEE IEDM Technical Digest, 423–426 (December 1999)
Copeland, M.A., Rabaey, J.M.: Dynamic amplifiers for M.O.S Technology. Electronics Letters 15(10), 301–302 (1979)
Murmann, B., Boser, B.: A 12-bit 75-MSamples/s pipelined ADC using open loop residue amplification. IEEE JSSC 38(12), 2040–2050 (2003)
Sepke, T., Fiorenza, J.K., Sodini, C.G., Holloway, P., Lee, H.-S.: Comparator-based switched-capacitor circuits for scaled CMOS technologies. IEEE JSSC 41(12) (December 2006)
Momeni, M., Basinschi, P.B., Glesner, M.: Comparison of Opamp based and Comparator based Delta-Sigma modulation. Design, Automation and Test in Europe (2008)
Schaumann, R., Valkenberg, M.E.: Design of Analog Filters. Oxford University Press (2006)
Johns, D., Martin, K.: Analog Integrated Circuit Design. John Wiley and sons, Inc. (1997)
Baker, R.J.: CMOS Circuit Design, Layout, and Simulation. John Wiley and sons, Inc. (2005)
Behzad Razavi, R.F.: Microelectronics. Prentice-Hall (1998)
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© 2012 Springer-Verlag Berlin Heidelberg
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Sahoo, M., Amrutur, B. (2012). Comparison of OpAmp Based and Comparator Based Switched Capacitor Filter. In: Rahaman, H., Chattopadhyay, S., Chattopadhyay, S. (eds) Progress in VLSI Design and Test. Lecture Notes in Computer Science, vol 7373. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-31494-0_21
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DOI: https://doi.org/10.1007/978-3-642-31494-0_21
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