Memristor-Controlled Reconfigurable N-path Filter Structure Design and Comparison

This paper presents the integration of memristors into N-path filter architectures to develop reconfigurable N-path filters with a tuneable bandwidth. Two different memristor-based N-path filter designs are proposed and systematically compared. One of the architectures was experimentally validated by interfacing it with a memristor package in a laboratory environment, demonstrating a tuneable bandwidth ranging from 1.5 kHz to 2 kHz at a centre frequency of 1 MHz, corresponding to a tuneable quality factor (Q factor) of between 500 and 667. Additionally, this design enables centre frequency tuning from 0.9 MHz to 1.2 MHz while maintaining a fixed Q factor of 600. The second architecture was evaluated through simulations in the Cadence Virtuoso environment using a memristor model. The results indicate a tuneable bandwidth from 0.99 MHz to 1.38 MHz at a centre frequency of 1 GHz, corresponding to a tuneable Q factor ranging from 730 to 1010. Furthermore, this design allows the centre frequency to be adjusted within the range of 0.99 GHz to 1.38 GHz while preserving a fixed Q factor of 1000. These findings highlight the potential of memristor-based N-path filters in achieving reconfigurable and high-Q filtering capabilities for RF applications.