Design of current mode, low voltage and electronically tunable class AB differantial type KHN filter in the log domain

Abstract

In this paper, a current mode, low voltage and electronically tunable Class AB differential type KHN filter is synthesized in the log domain. The filter's Q quality factor and natural frequency could be tuned by varying the currents of the current sources. The signal in the filter is processed by integrators synthesized in the state space and arithmetic blocks. The proposed universal filter with 1.5 V voltage source is simulated in PSpice for ideal and CBIC-R type transistors. By varying the values of the current sources, the natural frequency is swept for 50kHz-5MHz and Q quality factor is tuned for 0.707-5 electronically. The obtained simulation results are given. © 2005 IEEE.