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This paper presents the study on the effect of different widths in CMOS rectifier for low voltage and frequency application. The model is powered by 1V peak voltage of AC supply with frequency of 50Hz. This low frequency is used in this paper to match with the supply frequency from the power plant. The design is based on the CMOS 0.18um technology. The paper focuses on the effect of the two different width sizes (4um and 50um). The result for 4um is 558.36mV and increased by 40.6% for 50um width. The simulation is run using CADENCE Simulation Tools software.