A digitally tunable 4th order Gm C low pass filter for multi standards receivers
This paper presents a digitally tunable 4th order Gm C low pass filter (LPF) for multi standards radio receivers. The cutoff frequency tuning is provided by changing the transconductance of a reconfigurable operational transconductance amplifier (OTA) Two control bits are employed to digitally control the OTA transconductance and also the power consumption. This LPF is designed in a 180 nm CMOS process and powered by a 1.8 V power supply. Post layout simulation analysis indicate that this flexibility provides a cutoff frequency of 2.54/5.11/7.68/10.29 MHz with a power consumption ranging from 10.27 to 12.69 mW. The designed filter achieves an IIP3 of 4.14 dbm for a signal bandwidth of 10.29 MHz and electrical characteristics comparable to recent published works in the literature.
2016 29th Symposium on Integrated Circuits and Systems Design (SBCCI)