Abstract
A high power supply rejection ratio (PSRR) bandgap voltage reference (BGR) which is used in the signal processing circuit of energy harvesters is presented in this paper. The PSRR of the BGR is improved by adding a pre-regulating circuit and a low pass filter. The pre-regulating circuit mainly improves the BGR PSRR at low frequency and the low pass filter mainly improves the BGR PSRR at high frequency. The BGR is verified by SMIC 0.18 μm1P6M process. The supply voltage is 2.5 Vand the BGR provides a reference voltage of 1.19 V. The simulation results show that the PSRR at 1MHz is about -40 dB and the PSRR at DC region is about -125 dB. Besides, this circuit enhances the line regulation performance. When the supply voltage varies from 2.5 V to 6 V, a stable output voltage can be obtained. The overall current consumption of this design is less than 50 μA under 2.5 V.
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