Electronically Tunable Analog Active Filters
نویسنده
چکیده
Electronically tunable RC-active ladder filter transfer fun& tions ore realized by employing the four quadrant analogue multiplier os the basic nonlinear network element. All the frequency dependent branches of a conventional RC-active ladder structure realizations ore simulated by means of impedance scaling networks. The scaling of these impedances allows the cutoff frequency of an elliptic low-pass or high-pass transfer function, of arbitrary order, to be varied by means of a tuning voltage. The method is strictly analogue and leads to practical filters that employ presently available integrated circuits; external timing signals or reference oscillators ate not required in order to accomplish tuning.
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تاریخ انتشار 1999