A −72 dB @ 2 MHz IM3 CMOS tunable pseudo-differential transconductor

A novel CMOS highly linear tunable pseudo-differential transconductor is presented. By using different linearization techniques, a new fully CMOS OTA has been designed that outperforms previous CMOS pseudo differential OTA implementations in terms of linearity. It has been designed in a 0.5 mum-CMOS technology with a single 3.3 V voltage supply. Experimental results show a IM3 of -72 dB for a 1 Vpp input signal at 2 MHz with a current consumption under 5 mA. A large tuning range is obtained with the IM3 always under -70 dB for the same input signal.