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A sub-bandgap circuit architecture employed to achieve a precision reference in 28 nm CMOS technology is described. The 500 mV voltage reference exhibits < 10 ppm/°C drift from −40 to 125°C and 5.5 μV of root-mean-square (RMS) noise in a 0.1–10 Hz bandwidth, dissipates 500 μW of power on a 1.2 V supply and occupies 0.09 mm².
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R.J. Widlar
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New developments in IC voltage regulators.
IEEE J. Solid-State Circuits
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http://iet.metastore.ingenta.com/content/journals/10.1049/el.2013.3952
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