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《Microelectronics & Computer》 2012-05
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Low-temperature-drift CMOS Voltage Reference Used in LED Driver

XIA Xiao-juan1,ZHANG Hong-yu2,GU Wei1(1 College of Electronic Science and Enginering,Nanjing University of Posts and Telecommunications,Nanjing 210003,China;2 Nanjing Micro One Electronics Inc.Nanjing,Nanjing 210041,China)  
A low temperature drift CMOS voltage reference used in LED driver is designed.The principle of bandgap voltage reference is used in the proposed circuit.The structure is also improved to decrease the effect of offset voltage.Multi-output is also obtained to face the demand of LED driver chip.The proposed circuit is designed and simulated in CSMC 0.5 μm CMOS process.Three stable output voltage is get with 4 V VDD and they are 200 mV,600 mV and 1 V.The temperature coefficient is 16.9 ppm/℃ when the temperature is changed between-45 ℃ and 85 ℃.The PSRR is greater than-70 dB at 1 kHz.
【Fund】: 江苏省高校自然科学基金(10KJB510015);; 南京邮电大学引进人才科研启动基金(NY210075);南京邮电大学教学改革研究项目(JG03311JX24)
【CateGory Index】: TN432
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