Design of Bandgap Voltage Reference Used in Television System
Duan Xiaozhong · Video Engineering · 2013
In view of the low temperature characteristics of CMOS bandgap voltage reference of traditional first order temperature compensation.In this paper,based on the traditional circuits,high order temperature compensation is used to improve temperature characteristics,and add former regulator with negative feedback into the circuit is added to improve the power supply rejection of reference voltage.Through simulation,by using SMIC0.18 technology,the temperature coefficient of the reference voltage is 2.34×10-6/℃ in the temperature range of-20 ℃~+58 ℃,the temperature coefficient of the reference voltage is 2.21×10-6/℃ in the temperature range of 58 ℃~120 ℃.The low frequency power supply rejection ratio of the output voltage is 116 dB,and being 73 dB at 10 kHz.