Highly-accurate low-voltage sourcedegenerated-based V-I converter using positive feedback

A new low-voltage CMOS V-I converter is presented, based on source degeneration. To achieve a highly linear and accurate resistance-based V-I conversion, it makes use of positive feedback g_m-boosting while body effect compensation is realised through diode-connected transistors. Post-layout results from a 3 V-0.5 mum CMOS design show 0.993% V-to-I conversion accuracy, THD below -60 dB at 10 MHz up to 0.7 V_p-p,input and BW above 400 MHz with 2.1 mW power dissipation