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The Bandgap Reference

A CirCuit for All SeASonSBehzad Razavi IEEE SOLID-STATE CIRCUITS MAGAZINE Summer 2016 9 SSince its inception in the late 1960s, the Bandgap circuit has served as an essential component in most inte-grated circuits. This simple, robust idea provides a temperature-indepen-dent (TI) voltage and a proportional-to-absolute-temperature (PTAT) current . In this article, we study the principles of Bandgap circuit Brief HistorySemiconductor technology does not directly offer any electric quantity that is nominally independent of the ambi-ent temperature.

is that the op amp does not drive resistors and can thus maintain a high loop gain. The Basic Idea As mentioned in the pre - vious section, the volt-age across a pn junction and hence the base-emitter voltage, V BE, of a bipolar transistor exhibit a negative TC. It can be shown that, for a constant collector current, BE /, T V T Vm BE 4 VE Tg q ...

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