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Design of Filters Using CFOAs

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Current Feedback Operational Amplifiers and Their Applications

Part of the book series: Analog Circuits and Signal Processing ((ACSP))

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Abstract

This chapter deals with the application of CFOAs in filter design. We first present a number of multifunction voltage-mode and current-mode biquad filter topologies employing two to five CFOAs choosing from a large number of existing configurations. In the category of voltage-mode filters, both single input multiple output (SIMO) type as well as multiple input single output (MISO) type configurations have been included and their significant features have been highlighted. However, in the category of current-mode filters, only MISO-type universal biquad filters have been included since no SIMO-type CFOA-based biquads are known to exist till now. Subsequently, a number of universal, mixed-mode biquads capable of realizing all the five standard filter functions in all the four possible modes, namely, VM, CM, trans-impedance and trans-admittance have been highlighted. This is followed by active-R multi-function biquads, inverse active filters, MOSFETs-C filters and the design of higher order filter employing CFOAs in which case doubly-terminated wave active filters based upon LC ladder proto-types and higher order modular filter structures are described in detail. Finally, a number of ideas for further research have also been indicated.

The original version of this chapter was revised. An erratum to the chapter can be found at DOI: http://dx.doi.org/10.1007/978-1-4614-5188-4_9

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Notes

  1. 1.

    In the category of SIMO-type CM biquad, surprisingly, no configuration based on CFOAs is known to have been published in the technical literature till the time of writing this chapter.

  2. 2.

    A re-analysis of the circuit of Fig. 4.16 reveals that this circuit needs two realization constraints G1 = G4 and G2 = G5, in case of BS filter realization also, which appear to have been missed in [16] inadvertently.

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Authors and Affiliations

  1. Division of Electronics and Communication Engineering, Netaji Subhas Institute of Technology, New Delhi, India

    Raj Senani

  2. Jamia Millia Islamia, Electronics and Communication Engineering, F/O Engineering and Technology, New Delhi, India

    D. R. Bhaskar

  3. Electronics and Communication Engineering, HRCT Group of Institutions, F/O Engineering and Technology, Mota, Ghaziabad, India

    A. K. Singh

  4. Department of Electronics Engineering, Institute of Engineering and Technology, Lucknow, India

    V. K. Singh

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  1. Raj Senani
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  3. A. K. Singh
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Senani, R., Bhaskar, D.R., Singh, A.K., Singh, V.K. (2013). Design of Filters Using CFOAs. In: Current Feedback Operational Amplifiers and Their Applications. Analog Circuits and Signal Processing. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-5188-4_4

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  • DOI: https://doi.org/10.1007/978-1-4614-5188-4_4

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