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A Sub-1 ppm/°C Reference Voltage Source with a Wide Input Range
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DOI：10.3390/mi15101273.png)
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Abstract
En 中文
With the continuous advancement of electronic technology, the application of high-voltage integrated circuits is becoming increasingly prevalent in fields such as power systems, medical devices, and industrial automation. The reference circuit within high-voltage integrated circuits must not only exhibit insensitivity to temperature variations but also maintain stability across a broad voltage supply. This paper presents a bandgap reference (BGR) source capable of operating over a wide input range. This BGR employs a high-order curvature compensation method to eliminate nonlinear voltage terms, resulting in minimal temperature drift. The circuit achieves an impressive temperature coefficient (TC) of 0.88 ppm/degrees C over a temperature range from -40 degrees C to 130 degrees C. To ensure stable operation within a 4-40 V range, the design incorporates a pre-regulation circuit that stabilizes the supply voltage of the BGR core at a fixed value, thereby enhancing the ability to withstand variations in power supply voltage.
Keywords:
bandgap reference
wide input range
high-order curvature compensation
temperature coefficient
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