An Improved Bandgap Reference (BGR) Circuit with Constant Voltage and Current Outputs

Bandgap Reference (BGR) circuit is the main crucial element in designing any electronic systems. It has a stabilized voltage/current value over process-voltage-temperature (PVT) variations. In this paper, an enhanced 2-stage BGR circuit with constant voltage and current outputs is presented with a 1.2 V supply voltage. The first stage provides a fixed BGR voltage of 1 V with a temperature coefficient (TC) of 35 ppm/0C. It includes a 2-stage op-amp for higher power supply rejection ration (PSRR). The op-amp has a closed feedback loop to neglect the current proportional-to-absolute-temperature (PTAT) and the negative TC. The second stage provides a higher current gain and an enhanced PSRR. It produces a fixed BGR current of 100 µA. Simulation results including PVT variations and Monte Carlo analysis have been performed, in 65 nm CMOS technology, to the proposed design which achieves a chip area of 0.03 mm2, a higher temperature range of -80~1200C, a 35 ppm/0C TC, a -32 dB PSRR at 0.1 MHz and a 0.13 µW consumed power

This article is published in peer review journal and open access journal, International journal of research in engineering and innovation (IJREI) which have a high impact factor journal for more details regarding this article, please go through our journal website.

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