A wide-supply range high-PSR bandgap voltage reference

Most precision references employ a PN junction diode voltage, since it is very predictable meaning that it does not vary significantly with process and its behavior over a given temperature range is well characterized. First-order and second-order references that base their operation on use of forward-biased diode voltage are named as bandgap references because the compensated reference output voltage is equal to or some fraction of the bandgap voltage of the material used in the process. However, since low-power consumption and low- supply levels are the main objectives of today?s IC market, classical bandgap references leave much to be desired. This thesis targets a sub-1 V bandgap voltage reference circuit that can operate in (a) a wide supply voltage range (1 - 5.5) V, (b) a wide temperature range (-40 125) °C, and still can maintain a high PSR performance while consuming a total current of only 5 µA resulting in low power consumption. The proposed circuit is designed for AMS 0.35µ C35B4C3 process.