In this chapter we use our compact semi-empirical CNTFET model, examined in the previous chapters, to design some electronic circuits. In particular we investigate about the effects of the CNT quantum resistances and inductances, then demonstrating their role for both analog and digital applications at frequencies over about ten THz. Moreover the simulations of typical analogue circuits and logic blocks are obtained implementing the CNTFET model both in Verilog-A and in SPICE, using ABM library, in order to demonstrate the model flexibility and to compare them.