A current-mode bandgap voltage reference with low temperature coefficient and high PSRR using subthreshold MOSFET in 28 nm CMOS.
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| Title: | A current-mode bandgap voltage reference with low temperature coefficient and high PSRR using subthreshold MOSFET in 28 nm CMOS. |
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| Authors: | ZHAO, Chengzhuo1, LÜ, Fangxu1 lvfangxu1988@nudt.edu.cn, XU, Weixia1, HUANG, Heng1, LUO, Zhang1, XIN, Kewei1, WANG, Wenchen1, LI, Meng1, LAI, Mingche1, PANG, Zhengbin1 |
| Source: | Computer Engineering & Science / Jisuanji Gongcheng yu Kexue. May2026, Vol. 48 Issue 5, p770-778. 9p. |
| Subjects: | Voltage references, Metal oxide semiconductor field-effect transistors, Thermal properties, Temperature effect, Analog circuits |
| Abstract: | As the size of core devices in integrated circuits shrinks, large-scale process gradually fails to meet the performance requirements of circuits under advanced technologies. As a fundamental unit in analog circuits, the bandgap voltage reference needs to adapt to process variations. This paper, utilizing a 28 nm CMOS process, proposes a current-mode bandgap voltage reference with excellent power supply rejection ratio (PSRR) over a wide bandwidth range and a low temperature coefficient. Unlike conventional circuits that employ bipolar transistors to generate positive and negative temperature coefficient voltages, this bandgap voltage reference generates a reference voltage by leveraging the temperature characteristics of MOSFET voltages in the subthreshold region. Subthreshold devices have a low turn-on voltage, significantly reducing the common-mode voltage of the amplifier, increasing the vertical voltage margin. By incorporating a current mirror structure to generate a secondary power supply and using a common-gate transistor to increase output resistance, the PSRR over a high bandwidth range is enhanced. Based on a current-mode bandgap reference, this voltage reference circuit operates with a 1.8 V power supply. Under the tt process corner, it provides a stable reference voltage of 943 mV within the temperature range of -40~125 °C, with a temperature coefficient of the reference voltage of 6.1 ppm/ °C. Within an input voltage range of 1.5~5 V, the line regulation is 0.33%. The PSRR is -64.3 dB at DC and remains below -64.1 dB within the frequency range of 0~16 kHz, still reaching -58 dB at 100 kHz. The layout area is 0.003 8 mm², and the quiescent power consumption during operation is 16.56 μW. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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