Design and analysis of switch mode power supply using CMOS single-phase full bridge rectifier

This paper presents the design of a low leakage CMOS based switch mode power supply. The switch mode power supply converts the available deregulated A.C or D.C input supply to a regulated D.C output supply. This paper reviews the limitations of conventional linear regulated power supply and focuses on the advantages of switch mode power supply (SMPS) technique. The high frequency transformer used in the proposed circuit is much smaller in a size and weight compared to the low pitch transformer of the linear power supply circuit. The switching losses in modern switches like MOS are much lowered as compared to the loss in the linear element. The proposed circuit easily filtered the high frequency ripple produced in the circuit using smaller volumes of filtering elements. Leakage current, leakage power dissipation, average power dissipation and delay performance parameters are calculated. Due to simulation results, it is realized that the leakage current and power dissipation are reduced and delay is improved (reduced delay).The complete simulation and calculation method have been done in 45 nm technology at cadence virtuoso tool. The circuits were operated at 0.7v power supply.