Active simulation of passive leapfrog ladder filters using DVCCs

In this paper, novel CMOS realization of a differential voltage current conveyor (DVCC) is described. These circuits are powerful building blocks, especially for applications demanding differential or floating inputs like impedance converter circuits and current mode instrumentation Amplifiers. An alternative approach for realizing current-mode leapfrog ladder filters using differential voltage current conveyor (DVCC) as active circuit building blocks is presented. The proposed architecture which is composed of only one fundamental active building blocks and some passive element enjoys having simple structure and minimum component counts, making the approach conveniently for further integrated circuit implementation with systematic design and dense layout. As illustrations to demonstrate the systematic realization of current-mode ladder filters, a fifth-order Butterworth low-pass filter and a sixth- order Chebyshev band-pass filter are designed and simulated using PSPICE.