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Active Switched Capacitor Sampled-Data Networks

Active Switched Capacitor Sampled-Data Networks

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In this chapter we describe and demonstrate techniques for the analysis and design of active switched capacitor networks. Because of their sampled-data character, switched capacitor networks are most conveniently analyzed and designed, in the z-transform domain, like digital filters. However, SC filters are analog networks; thus, the analog concepts of impedance and loading, which are absent in digital filters, are retained. In this chapter a library of z-domain equivalent circuits will be developed to facilitate the analysis, design, and, more importantly, to aid the reader's understanding of switched capacitor networks. With these equivalent circuits, the familiar circuit theory tools, which we use routinely in the analysis of continuous active networks, are extended for use in switched-capacitor networks. Like active-RC networks, there are many SC topologies that can be used to realize a given z-domain transfer function. We will examine some of the more interesting and useful ones.

Chapter Contents:

  • 6.1 Introduction
  • 6.2 Applications of z-Transform Techniques to the Analysis of Switched Capacitor Networks with Biphase Switches
  • 6.3 z-Domain Equivalent Circuit Models for SC Building Blocks
  • 6.4 Analysis and Synthesis of First-Order SC Networks
  • 6.5 Realization of Precision MOS Active-SC Filters
  • 6.6 A Family of Parasitic-Free Active-SC Biquads [P18]
  • 6.7 A Few Comments on the Realization of High-Order Active-SC Filters
  • 6.8 Summary
  • References
  • Problems

Inspec keywords: active filters; equivalent circuits; transfer functions; digital filters; switched capacitor filters; Z transforms

Other keywords: continuous active network analysis; sampled-data character; circuit theory tools; Z-domain transfer function; active-RC networks; switched capacitor filter topology; digital filters; active switched capacitor sampled-data network analysis; analog networks; Z-domain equivalent circuits; SC filter topology; Z-transform domain

Subjects: Digital filters; Time varying and switched networks; Integral transforms; Active filters and other active networks

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