3 ppm Ultra Wide Range Curvature Compensated Bandgap Reference
نویسنده
چکیده
In this report a current mode bandgap with a temperature coefficient of 3 ppm for the range from -117◦C to 144◦C is presented. 2nd order curvature compensation is used by using a third BJT with a temperature constant current and a second error amplifier to get a nonlinear temperature coefficient current in extra to enhance the accuracy. The required minimum supply voltage is 1.3V for 3ppm and 1.2V for 10ppm TC. The circuit has a line regulation of 0.86mV/V, PSRR of -57dB at 100Hz and -56dB at 1kHz. The bandgap core dissipates 22uA current and the error amplifier dissipates 3uA each. The process used is tsmc 0.18μm. The chip area is estimated as 280 μm ×260 μm. Process variation and mismatch as well as amplifier offset voltage effects are simulated. A resistor trimming circuit of 4 bits is made to compensate for the variation and mismatch to as much as ±5%.
منابع مشابه
A 1.6 ppm/°C bandgap voltage reference for an extended operating temperature range
A new CMOS bandgap voltage reference (BGR) is proposed and simulated using Silterra 0.13 μm CMOS technology. The proposed BGR utilizes 3 curvature-corrected current generators that compensate for the output voltage variation in an extended temperature range. The proposed circuit generates an output voltage of 1.181 V with a variation of 380 μV from !50 °C to 150 °C.
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