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Multifunction CM/VM Biquads Realized with a Single CFOA and Grounded Capacitors

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New configurations are proposed which realise multiple-input-single-output-type multifunction current mode and voltage mode biquads capable of realizing the low-pass, band-pass, high-pass, and notch functions from the same configuration using only a single current feedback op-amp, four resistors and two grounded capacitors. The new circuits offer several advantageous features over the previously known single-current feedback op-amp/second generation current conveyor-based biquads. Electronic tunability of οo is feasible by replacing the resistors by appropriately-valued CMOS voltage-controlled-resistors driven by a common external control voltage. PSPICE simulation and hardware implementation results are given which have demonstrated the workability of the proposed configurations.
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Document Type: Research Article

Affiliations: Analog Signal Processing Research Lab, Division of Electronics and Communication Engineering, Netaji Subhas Institute of Technology, Azad Hind Fauj Marg, Sector-3, Dwarka, New Delhi-110 045, India.

Publication date: 2003-10-01

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