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Temperature-Compensated β-Multiplier Current Reference Circuit
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DOI：10.1109/TCSII.2016.2634779.png)
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Abstract
En 中文
This brief presents the new simple schematic for the temperature stable current references based on the well-known beta-multiplier circuit. The proposed reference utilizes only four MOS transistors and two lateral PNP transistors, which are usually available in standard CMOS technologies along with one well resistor. The temperature-compensation technique has a low process dependence and needs no trimming. However, resistor trimming can be used to precisely set the output current value. The circuit implementation of the proposed technique was fabricated in a standard 0.35-mu m CMOS process to source a 16-mu A current. The digital calibration circuit allows setting of the output current in 32 100 nA-steps. The proposed current reference achieves the supply sensitivity of several %/V without the use of the external bandgap voltage reference for the supply regulation. The measured temperature coefficient is 105 ppm/degrees C over the temperature range from 0 to 110 degrees C.
Keywords:
Analog integrated circuit
CMOS process
current reference
temperature coefficient
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