Design of Third order Wide Tuning Range Gm-C filter for direct conversion receivers

In this work, a third-order channel selection filter for multi-mode direct-conversion receivers is designed. The filter operates effectively over a wide tuning range of frequencies while ensuring a maximally flat response. The cut-off frequency of the Gm-C filter is tuned by varying the bias current in the proposed transconductor. The designed filter targets wireless applications of Bluetooth, CDMA and other IEEE protocols. The design is implemented in the UMC 90 nm CMOS technology and the results show that the power consumption of the designed filter is less than 0.25 mW for maximum cut-off frequency from a 1V supply voltage. The layout area of the whole filter architecture is 0.01 mm
²
.