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0.55–1.8 V, 7.5 nW, 225.5 mV, CMOS-only subthreshold voltage reference

0.55–1.8 V, 7.5 nW, 225.5 mV, CMOS-only subthreshold voltage reference

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This Letter presents a wide supply voltage range, ultra-low power, and CMOS-only subthreshold voltage reference. A complementary-to-absolute-temperature () generator implemented by a standard transistor and a high transistor is used to obtain a negative temperature coefficient (TC) voltage. While, a proportional-to-absolute-temperature () generator adopts a unbalanced differential pair to achieve a positive TC voltage. With both generator and generator, the CMOS-only voltage reference circuit is proposed, which is implemented in a standard CMOS process. The simulation results show that the mean output reference voltage is 225.5 mV at room temperature with a supply voltage as low as 0.55 V, meanwhile the output reference voltage achieves a TC of with a temperature range from to . With a supply voltage of 0.55 V and at room temperature, the current consumption is 13.6 nA and the power consumption is only 7.5 nW. The reference circuit correctly works with a supply voltage ranging from 0.55 to 1.8 V, and it obtains the line regulation of 0.0022%/V.

http://iet.metastore.ingenta.com/content/journals/10.1049/el.2018.7970
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