We propose a novel standard ternary inverter (STI) based on nanoscale planar CMOS technology for a compact design of multi-valued logic (MVL). By enhancing junction band-to-band tunneling (BTBT) leakage with high channel doping for STI operation, the 'third' intermediate state (VINT) can be successfully obtained at VDD/2 in the conventional binary CMOS inverter. It is demonstrated that the variability of the intermediate level (ΔVINT<80mV) can be allowable into the worst noise margin (>0.1V).