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A low power voltage source is generated by altering the device size in existing topology has been presented. Bandgap voltage reference is generated by combination of start-up, supply independent, operational amplifier (Op-amp) and bandgap core circuits which has been designed such that low sensitivity of temperature and supply variation. It has been designed with minimum supply of 0.8 V without use of low threshold device, and the maximum supply current is 35 ?A. It has been implemented in 180 nm standard digital CMOS Process. The circuit generates a reference voltage of 540 mV and has a temperature coefficient of 14 ppm /?C from −40 ?C to 120 ?C. The generated reference voltage is independent of temperature and supply variations have been mathematically proved by analyzing the circuit design. Also, proper selection of on-chip passive components and its values has been chosen which is based on low noise. Comparing the pre and post layout simulation results has been presented

Design and Implementation of Op-Amp Based Low-Power CMOS Bandgap Voltage Reference with Minimum Supply oF 0.8-V