Design of Bandgap Voltage Reference Circuit for Low Temperature Coefficient

• Main Authors: Kuan-Fu Lin, 林冠甫
• Other Authors: none
• Format: Others
• Language: en_US
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/38754814300432393019

碩士 === 大同大學 === 電機工程學系(所) === 92 === The objective of this work is to design a bandgap voltage reference circuit that can be operated with 1.3 V of supply voltage. The main work is to design a circuit that utilizes a PTAT (proportional to absolute temperature) to compensate the negative temperature coefficient resulting from BJT. We use the ways of the sum of two currents which temperature coefficients are compensated and the suitable input voltage nodes of opamp. We do not use a complex low-voltage opamp and can improve the conventional linear bandgap voltage reference generator circuit. The output reference voltage is 554 mV, and it can be changed by the resistance. Therefore, this circuit can improve the problem of the fix output voltage of 1.25 V in the conventional bandgap voltage reference circuit. The temperature coefficient is only 0.68 ppm/C, and it can prove that the output voltage almost would not be affected by the temperature. Our circuit is fabricated by TSMC 0.35 um 1P4M CMOS process.