Highly linear wide-swing continuous tuning of CMOS transconductors.

A technique to improve the input and output range of CMOS transconductors with resistive current division for continuous tuning is presented. Using it, a tunable transconductor is proposed which features high linearity over a wide input range and simplicity. Measurement results of the transconductor, fabricated in a 0.5 μm CMOS process, show an IM3 of -66 dB for a ±1.65V supply and two input tones centered at 1MHz of 1 Vpp each, and only 0.7 mW of power consumption. This represents an improvement of 13 dB versus the same transconductor using conventional current division. [ABSTRACT FROM AUTHOR]