Self-Cascode MOSFET with a Self-Biased Body Effect for Ultra-Low-Power Voltage Reference Generator

Hao ZHANG  Mengshu HUANG  Yimeng ZHANG  Tsutomu YOSHIHARA  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E96-C   No.6   pp.859-866
Publication Date: 2013/06/01
Online ISSN: 1745-1353
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Analog Circuits and Related SoC Integration Technologies)
Category: 
Keyword: 
voltage reference,  subthreshold,  self-cascode,  body effect,  ultra-low power,  low output,  

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Summary: 
This paper proposes a novel approach for implementing an ultra-low-power voltage reference using the structure of self-cascode MOSFET, operating in the subthreshold region with a self-biased body effect. The difference between the two gate-source voltages in the structure enables the voltage reference circuit to produce a low output voltage below the threshold voltage. The circuit is designed with only MOSFETs and fabricated in standard 0.18-µm CMOS technology. Measurements show that the reference voltage is about 107.5 mV, and the temperature coefficient is about 40 ppm/, at a range from -20 to 80. The voltage line sensitivity is 0.017%/V. The minimum supply voltage is 0.85 V, and the supply current is approximately 24 nA at 80. The occupied chip area is around 0.028 mm2.