High-Order Gm-C Filters with Current Transfer Function Based on Multiple Loop Feedback

Despite the wealth of literature on Gm-C filters, the synthesis of high-order filter characteristics is still an active topic. In this paper the realization of Gm-C filters with current transfer functions based on multiple loop feedback structures are presented. The new method presents 32 structures in case of third-order filter. All the filter architectures contain minimum number of components and all internal nodes in canonical realizations have grounded capacitors. PSpice simulation result for band-pass filter with current transfer function derived from the proposed model verifying the analytical results using 0.35 ¿m technology is also given.