To reduce the quiescent current and chip area of the bandgap reference voltage source, a low-power sub-threshold reference voltage source circuit is designed by optimizing the bias current generation circuit and the dual-output startup circuit. The bias current generator employs sub-threshold-operated NMOS transistors instead of BJTs so as to provide nA-level biasing for the reference output circuit, significantly reducing power consumption and area. The startup circuit adopts a dual-output structure, providing an additional charging and discharging path for the bias current generation circuit during power-up, eliminating degenerate operating points and accelerating settling time. Based on the 0.5 μm CMOS process, the circuit design and tape-out testing are completed. The results show that within the power supply voltage range of 1.8~5 V, the reference output voltage is 1.145 V, and the maximum line regulation is 0.6 ×10-3; within the range of -20~100 ℃, the temperature coefficient is 45.6 ppm/℃; at low frequencies, the power supply rejection ratio is -84 dB@10 Hz, and over the entire frequency range, the power supply rejection ratio is less than -26 dB; the static current is less than 270 nA; and the layout area is 0.02 mm². This reference voltage source features a low power consumption and a compact area, making it suitable for energy-constrained applications.
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基金资助
湖南省自然科学基金资助项目(2024JJ7610)
Natural ScienceFoundation of Hunan Province(2024JJ7610)
湖南省教育厅科学研究项目(24A0227)
Scientific Research Fund of Hunan Provincial Education Department(24A0227)
湖南省研究生科研创新项目(CX20210826)
Postgraduate Scientific Research Innovation Project of Hunan Province(CX20210826)
国家级大学生创新创业训练计划项目(202210536038)
National Undergraduate Training Program for Innovation and Entrepreneurship(202210536038)