This communication describes the resistorless simulation of the floating lossless inductor using three voltage differencing buffered amplifiers (VDBAs) and one grounded capacitor. The circuit employs only a grounded capacitor, and no other extra resistor element is employed. Thus, it is suitable for further communication integrated front-end circuit design in short-range wireless and application. The realized equivalent inductance value of the simulated inductor can be changed electronically via the external biasing currents of the VDBAs. Sufficient simulation results with the PSPICE program are provided to validate the functionality of the realized inductor. In addition to establishing the practical operation of the simulator, the measured test results obtained from hardware implementation using readily available integrated chips (ICs) are also included.

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This paper presents an alternative approach for realizing activeonly current-mode leapfrog ladder filters using multi-currentoutput differentiator. A novel multi-output differentiator, which is only composed of internally compensated type operational amplifier (OA) and operational transconductance amplifiers (OTAs), is first proposed. The proposed design procedures of the active-only current-mode highpass and bandpass leapfrog ladder filters employing only OTAs and multi-output differentiators without external passive elements are then presented. A property of this approach is the possibility of tuning the current transfer function by the external controlled transconductances. PSPICE simulation results . verifying theoretical predictions are included.

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