A 0.82 V Supply and 23.4 ppm/°C Current Mirror Assisted Bandgap Reference

Traditional BGR circuits require a 1.05V supply due to the V-BE of the BJT. Deep submicron CMOS technologies are limiting the supply voltage to less than 940mV. Hence there is a strong motivation to design them at lower supply voltages. The supply voltage limitation in conventional BGR is described qualitatively in this paper. Further, a current mirror-assisted technique has been proposed to enable BGR operational at 0.82V supply. A prototype was developed in 65nm TSMC CMOS technology and post-layout simulation results were performed. A self-bias opamp has been exploited to minimize the systematic offset. Proposed BGR targeted at 450mV works from 0.82-1.05V supply without having any degradation in the performance while keeping the integrated noise of 15.2 mu V and accuracy of 23.4ppm/degrees C. Further, the circuit consumes 21 mu W of power and occupies 73*32 mu m(2)silicon area.

Automated summary

This paper discusses the voltage limitation in traditional BGR circuits and proposes a new technique for operating at lower voltages. Experimental results show that this technique reduces power consumption and occupies less area while maintaining performance without degradation.