i am using clocked comparaters and i want that the comparator should be operate in subthreshold i.e my supply vtg is 0.35v and while simulating i am not getting good freq i.e i am getting only in mega but i want that one should operate for high freq(ghz) so what are the options to increase freq for subthresold operation for better delay.
I think to achieve GHz frequency you will have to reduce the gm/Id value (i.e. --> moderate inversion mode), which means reducing the transistor W/L ratio or increasing the drain current. S. the following (general) GBW (fT) vs. gm/Id plot: