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Current controlled bandpass filter based on translinear conveyors

Current controlled bandpass filter based on translinear conveyors

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A new concept to take advantage of the parasitic resistance that appears on port X of the second-generation current conveyors is introduced. This parasitic resistance, which is controllable in current, leads to the definition of the second generation current controlled conveyors (CCCII). A current controlled bandpass filter, operating in the current mode, is also described. It uses only two CCCII+s and two capacitors. Its central frequency can be adjusted by acting on the bias current of the conveyors. SPICE simulation results, in agreement with theory, are given for central frequencies around 30 MHz.

Inspec keywords: band-pass filters; radiofrequency filters; circuit tuning; current conveyors; active filters; frequency response

Other keywords: current controlled bandpass filter; second-generation current conveyors; central frequency adjustment; 30 MHz; current mode operation; translinear conveyors; parasitic resistance; bias current; CCCII; CCII

Subjects: Active filters and other active networks

References

    1. 1)
      • K.C. Smith , A.S. Sedra . A second generation current conveyor and its applications. IEEE Trans. , 132 - 134
    2. 2)
      • A. Fabre . Translinear current conveyors implementation. Int. J. Electron. , 619 - 623
    3. 3)
      • C. Toumazou , F.G. Lidgey , D.G. Haigh . (1990) Analog IC design: The current mode approach.
    4. 4)
      • Wiest, F., Fabre, A.: PCT/FR94/0064, May 1994, Patent pending 9306121, May 1993.
    5. 5)
      • Fabre, A., Alami, M.: `A versatile translinear cell-library to implement high performance analogASICS', IEEE Proc. EUROASIC'90 Conf., 1990, Paris, France, p. 89–94.
    6. 6)
      • A. Fabre . Dual translinear voltage/current convertor. Electron. Lett. , 1030 - 1031
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