Low-component-count active-only imittances and their application in realising simple multifunction biquads

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Low-component-count active-only imittances and their application in realising simple multifunction biquads

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Published

The authors present a class of second-order immittance simulation circuits and derive an exemplary multifunction voltage mode biquad. These circuits are realisable with only internally compensated type operational amplifiers and OTAs and do not require any external resistors or capacitors. Because of their active-only nature, the circuits are suitable for implementation in both bipolar or CMOS technologies. The workability of the circuits has been demonstrated by experimental results based upon a μA741 type IC operational amplifier and a CA 3080 type IC OTA.

Inspec keywords: electric immittance; biquadratic filters; operational amplifiers; active networks

Other keywords: CA 3080 type IC; multifunction biquads; active-only immittances; internally compensated op amps; operational amplifiers; μA741 type IC; second-order immittance simulation circuits; low-component-count design; OTAs; voltage mode biquad

Subjects: Active filters and other active networks

References

    1. 1)
      • I.A. Khan , M.T. Ahmed , N. Minihaj . Novel technique for immittance simulation- realisation of some all-activesimulators. Int. J. Electron. , 3 , 431 - 441
    2. 2)
      • T. Tsukutani , M. Ishida , S. Tsuiki , Y. Fukui . Current mode biquad without external passive elements. Electron. Lett. , 3 , 197 - 198
    3. 3)
      • K.R. Rao , S. Srinivasan . Integrable VCOs using the operational amplifier pole. AEU , 326 - 328
    4. 4)
      • Y. Tsividis , Y. Papananos . Continuous-time filters using buffer with gain lower than unity. Electron. Lett. , 8 , 629 - 630
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