MTCMOS DESIGN METHODOLOGIES AND CHARGE RECYCLING PROCESS
MTCMOS (Multi Threshold CMOS) technology provides a solution to the high performance and low power design requirements of modern designs. Low Vth and high Vth transistors are used in MTCMOS technology. Low Vth transistors are used to implement the desired functions. High Vth transistors are used to cut off the leakage current. The MTCMOS circuits ,however suffer from high energy overhead during the transitions between the active and stand by modes In this paper we (i) propose a new special flip flop which keeps a valid data during the sleep mode, (ii) develop a methodology which takes in to account the new design issues related to the MTCMOS technology. (iii).propose two adaptive MTCMOS schemes to address the growing leakage and delay spreads found in modern high performance designs. (IV) Propose a technique to lower the energy overhead during the transitions between the active and standby modes. The charge stored at the virtual lines is recycled during the active-to-sleep-to-active mode transitions with the proposed technique.
