Transcription of The Bandgap Reference
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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.
1971 introduced the first bandgap circuit (Figure 1]. This was fol) [3 - lowed by another topology presented by Brokaw in 1974 (Figure 2] and ) [4 many others later. The rise of CMOS technology in the 1970s posed the question of whether a stable volt-age reference could be created without the use of bipolar devices [5]. However, it was
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