Abstract
The minimum power supply voltage of a typical bandgap current reference (BGCR) is limited by operating temperature and input common mode range (ICMR) of a feedback amplifier. A new BGCR using a bandgap voltage generator (BGVG) is proposed to minimize the effect of temperature, supply voltage, and process variation. The BGVG is designed with proportional to absolute temperature (PTAT) characteristic, and a feedback amplifier is designed with weak-inversion transistors for low voltage operation. It is verified with a 0.18-㎛ CMOS process with five corners for MOS transistors and three corners for BJTs. The proposed circuit is superior to other reported current references under temperature variation from -40℃ to 120℃ and power supply variation from 1.2 V to 1.8 V. The total power consumption is 126 ㎼ under the conditions that the power supply voltage is 1.2 V, the output current is 10 ㎂, and the operating temperature is 20℃.
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