A bandgap reference is a temperature independent voltage reference circuit widely used in integrated circuits usually with an output voltage of 1.25V, close to the theoretical 1.22eV bandgap of silicon at 0k. It is the essential component of an analog-to-digital converter. There are some problems arising from temperaturedependent to power supply rejection ratio when implementing a bandgap reference circuit. The circuit uses a regulated cascade current mirror structure which is the best suitable current mirror for the bandgap reference circuit as it provides medium input and output compliance voltage and very high output resistance. The main design criteria for this project is to achieve PSRR above 60dB and a variation less than 3% resulting from temperature changes between 27C and 85C.
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