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A Single-Trim CMOS Bandgap Reference With a 3\sigma Inaccuracy of \pm 0.15% From {-} 40 ^{\circ} C to 125 ^{\circ} C

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4 Author(s)

A CMOS bandgap reference with an inaccuracy of ±0.15% (3 σ) from -40°C to 125°C is presented. In contrast to prior art, it requires only a single trim to achieve this level of precision. A detailed analysis of the various error sources is provided, and techniques to reduce them are discussed. The prototype bandgap reference draws 55 μA from a 1.8 V supply, and occupies 0.12 mm2 in a 0.16 μm CMOS process. Experimental results from two runs show that, with the use of chopping and higher-order curvature correction to remove non-PTAT errors, the residual error of a bandgap reference is mainly PTAT, and can be removed by a single room temperature trim.

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Solid-State Circuits, IEEE Journal of  (Volume:46 ,  Issue: 11 )