Design of high-performance current reference
Jie Liang · Shenyang Gongye Daxue xuebao · 2009
Aiming at the requirement of IC for multipath reference current,a high-performance bipolar current reference was designed.The basic principle of the traditional bandgap current reference was analyzed,and some typical current references were compared.Trough improving and optimizing the structure of the traditional current circuit,the temperature compensation can be realized,the temperature coefficient of the circuit can be greatly reduced and the power supply rejection ration can be improved.The simulation was carried out with HSPICE software and using BL bipolar process model.The simulation results indicate that the temperature coefficient of the current reference can be as low as 5×10-6 per centidegree within the temperature range of-40℃ to 85℃.The power supply rejection ration is about 104dB.The low temperature coefficient and high power supply rejection ration of current reference has been realized.