Design and Simulation of a Sixth Order Band-Pass Gm-C Filter

This paper is focused on achieving high-frequency CMOS circuits for continuous-time filters used in the range of tens of megahertz, used in wireless systems. The implementation and the performance of a 6
^th
order differential band-pass filter using the Gm-C (transconductance - capacitor) topology are analyzed. The Butterworth type of approximation is evaluated. The performances of the circuits are proved by using two basic methods to build a high-order filter: one by cascading Tow-Thomas biquads sections and the second one by emulating a passive LC ladder filter. The accuracy of Gm-C filters design is demonstrated by simulating all possible test scenarios. As a main contribution, the design of the building blocks was made based on the mathematical model. A comparison between the synthesis methods has been performed.