Traditional Banba bandgap is very popular in deep sub-micron CMOS technologies because of its sub 1V output nature. But unfortunately, it won’t provide PTAT nature current and has several operating points, unlike two in the voltage mode BGR. This work analyzes the Banba circuit in a detailed way so that it’s easy to demonstrate multiple stable operating and lists some of its other shortfalls. This paper presents a novel sub-1V bandgap architecture, which can provide PTAT current and sub-1V output without having multiple operating points. A modified self-bias opamp has been proposed to minimize the systematic offset and its temperature drift. A prototype was developed in 28nm TSMC CMOS technology and post-layout simulation results were performed. Proposed BGR targeted at 500mV works from 1V supply without having any degradation in the performance while keeping the integrated noise of 18.2µV and accuracy of 17.1ppm/0C, while the traditional Banba was resulting 23.4ppm/0C. Further, the circuit consumes 29.8µW of power and occupies 71*39µm2silicon area.
Nagulapalli, R.Hayatleh, K.
School of Engineering, Computing and Mathematics
Year of publication: 2022Date of RADAR deposit: 2023-06-06
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