A highly linear low voltage CMOS triode transconductor

The paper presents a highly linear CMOS triode transconductor with a wide tuning capability for low voltage and low power applications. The use of a novel feedback loop regulating the drain voltage of input transistor in triode region achieves a highly linear voltage to current conversion. This design uses UMC 0.18 um CMOS process. Simulation result shows the proposed transconductor, operated in 1.2 V supply voltage, has less than 0.1% total harmonic distortions (THD) for 1 MHz 0.8 Vp-p differential input. The power consumption is 203 uW, when 0.55 V control voltage is applied.