Abstract
This paper presents a CMOS subbandgap reference circuit operating at a low supply voltage. To support low-voltage operation, the subbandgap reference circuit uses nMOS transistors operating in weak inversion and a bulk-driven amplifier. Measurements of a chip fabricated in AMI 0.5 µm CMOS technology show that the subbandgap reference can operate with a 1 V supply voltage to produce a reference voltage of 337 mV with a temperature coefficient of 9.9 ppm/ °C and a voltage coefficient of 290 ppm/V over the temperature range of 10 °C to 100 °C. Measurements of a chip fabricated in UMC 0.13 µm CMOS technology indicate the capability of operation with a 0.4 V supply voltage.
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