A Self-Biased Subthreshold CMOS Voltage Reference with Temperature Compensation Circuit for IoT Self-Powered Sensor Applications

Abstract

This paper presents a subthreshold CMOS voltage reference structure that utilizes self-biased circuits. This voltage reference includes temperature compensation circuits to expand its operating temperature range and reduce its temperature coefficient. The proposed CMOS voltage reference is designed using a standard 0.18−μm CMOS process and has a small area of only 0.005 mm^2 . Post-layout simulation results demonstrate that the power consumption of the circuit at room temperature (25°C) is only 1.65 nW at a power supply voltage of 1 V. In this case, the voltage reference output is 316.56 mV, with a temperature coefficient (TC) of 2.79 ppm/°C in a wide temperature range from -40°C to 140 °C. Furthermore, the line sensitivity (LS) of the circuit is 0.022 %/V.

Yuxuan Huang

M.Sc.

My research interests include circuit design of low-power reference.

Feng Yan

PhD Student

My research interests include circuit design of analog front end for biomedical applications and sensor interfaces.

Kangkang Sun

PhD Student

My research interests include circuit design of analog to digital converter for biomedical applications and SAR ADC.

Jingjing Liu

Associate Professor

My research interests include low-power smart micro-sensor integrated circuit design, image sensors, biomedical sensors, and energy harvesting circuits.