A NOVEL ULTRA HIGH SPEED AND LOW POWER PHASE DETECTOR USING CARBON NANOTUBE FIELD EFFECT TRANSISTORS

As the scaling of conventional silicon transistors moves towards its limiting value, designers become interested to exploit novel nanotechnologies. A carbon nanotube field effect transistor (CNFET) is a potential alternative device that avoids most of the physical limitations. In this paper, a high speed, low power, high precision and extensive range CNFET based phase detector (PD) is presented. The sequential circuits and the feedback path are not used in the proposed PD to obtain the best speed. In addition, by employing a new method, the dead zone and missing edge problems are completely solved in the proposed PD without any need to apply extra delay cells. Therefore, the delay time mismatch is omitted in the proposed circuit. Simulation results using HSPICE based on the CNFET model show that the proposed PD consumes only 24.5 µw power and is much faster than the ones proposed in the previous works.