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Continuous-Time Active Filters - Biquadratic Realizations

Continuous-Time Active Filters - Biquadratic Realizations

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In this chapter, the design and performance of single-amplifier and multiple-amplifier active-RC and active-R(C) biquad circuits has been considered. Negative-feedback single-amplifier circuits have been shown to have low-Q sensitivities to passive components but large ωo and Q sensitivities to the Op Amp GB. The latter property restricted negative feedback circuits to low Q. On the other hand, positive-feedback circuits have been shown to offer the ability of trade-off between active and passive sensitivities and can be designed for higher Q than the negative-feedback circuits.

Chapter Contents:

  • 4.1 Introduction
  • 4.2 Single-Op Amp or Single-Amplifier Biquad (SAB) Configurations
  • 4.3 General Biquad Circuit Using a Single Op Amp
  • 4.4 Low-Sensitivity Multiple-Op Amp Biquad Realizations
  • 4.5 General Biquadratic Realizations with Multiple-Op Amp Biquads
  • 4.6 Active-R and Active-C Biquad Realizations
  • 4.7 Summary
  • References
  • Problems

Inspec keywords: continuous time filters; sensitivity analysis; operational amplifiers; feedback

Other keywords: active sensitivities; single-amplifier design; active-R(C) biquad circuit design; negative-feedback single-amplifier circuits; passive components; multiple-amplifier active-RC design; passive sensitivities; Op Amp GB; low-Q sensitivities

Subjects: Amplifiers; Active filters and other active networks; General circuit analysis and synthesis methods

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