1.33 mW, 2 V CMOS continuous-time bandpass filter with two decades of centre frequency tuning range and high Q

A g/sub m/-C bandpass biquad filter featuring two decades of centre frequency tuning capability and a wide range of quality factor tunability is presented. It uses a new linear operational transconductance amplifier (OTA) based on two crosscoupled class-AB pseudo-differential pairs, which exhibits a wide transconductance adjustability range with low power consumption. The filter has been fabricated in a standard 0.8 /spl mu/m CMOS process. Experimental results show a frequency tuning range from 300 kHz to 32 MHz and a maximum quality factor of 501. The filter is operated at 2 V supply voltage with a power consumption ranging from 1.18 to 1.8 mW.