Low-power low-voltage class-AB linear OTA for HF filters with a large tuning range

Based on a multiplier cell, a low-voltage class-AB linear OTA is proposed. The proposed transconductor exhibits a wide transconductance range with 90 MHz bandwidth and low distortion. The transconductor operates at a 2 V supply voltage with only 340 /spl mu/W of quiescent power consumption. A gm-C biquad filter section has been, built with 10.7 MHz nominal frequency and Q=40. The filter has been laid out using a 0.8 /spl mu/m CMOS technology.