The design of a CMOS bandgap reference (BGR), for portable applications with medium accuracy, is described and the measurement results of the fabricated chips are presented. The output voltage of the reference is set by resistive subdivision. In order to achieve small area and low power consumption, n-well resistors are used. This design features a reference voltage of 0.750 V with 1σ variation of 10 mV (1.3%) without trimming with a supply voltage range from 1 V to 1.6 V and temperature range of -20°C-50°C measured from 10 samples. The maximum supply current is 4.5 μA and the area of the design is ∼0.13 mm² with a standard 0.35 μm double-poly n-well CMOS process.
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