A High-Precision Voltage Reference with a Curvature-Compensated Bandgap for Fluorescence Detection

Abstract

Fluorescent optical fiber temperature sensors require accurate online temperature monitoring in hazardous environments with strong electromagnetic fields, high voltages, flammability, or explosiveness. This imposes stringent requirements on the temperature coefficient stability of the bandgap reference (BGR) circuit. To address these challenges, this paper proposes a high-order curvature compensation bandgap reference (HCC_BGR) circuit fabricated using a 0.18-μm bipolar-CMOS-DMOS (BCD) process. A traditional first-order bandgap reference (TRA_BGR) circuit is also fabricated for comparison. Experimental results demonstrate that the proposed HCC_BGR circuit generates a stable 1.22 V reference voltage with a low-temperature coefficient of 5.56 ppm/°C from −20°C to 85°C. Compared to the TRA_BGR circuit, the HCC_BGR reduces the temperature coefficient by 3.07 times. Furthermore, the low-dropout regulator (LDO) using the proposed HCC_BGR exhibits excellent line sensitivity of 1.52 %/V from 3.4 to 5 V.

Bingjun Xiong

PhD Student

My research interests include circuit design of optical receivers and references.

Wenji Mo

Master’s Student

My research interests include circuit design of low-power RISC-V processors and self-powered SoCs.

Feng Yan

PhD Student

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

Jian Guan

PhD Student

My research interests include the design of solar cells and energy harvesting circuits.

Weijie Ge

PhD Student

My research interests include the design of radio frequency integrated circuits and energy harvesting circuits.

Jingjing Liu

Associate Professor

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