Design of a bandgap voltage reference with low power, low TC and high PSR
Wan Zhi-l · Electronic Design Engineering · 2013
A new method to compensate the TC(Temperature Coefficient) of the bandgap voltage reference circuit is proposed in this paper,it contains the TC compensation both in the low and high range of temperature.The circuit achieves a TC of 0.445ppm/℃-0.604ppm/℃ over the temperature range of-40 ℃ to 125 ℃ with 1.109 0 V output reference voltage.In order to enhance the PSR over a broad frequency range,this paper also presents a pre-regulator which can boost the PSR of the circuit to-127.5 dB at 10Hz and-63 dB at 100 kHz.In addition,the static current of the proposed bandgap reference circuit is only 10 μA,and the power thus consumed is about 36 μW.The output voltage of the circuit is affected by the process variations slightly: the corner variations only yield a 60 μV output voltage difference.All the advantages above make this bandgap voltage reference circuit can be used in medical weak signal amplifying.