机构地区: 佛山科学技术学院机电与信息工程学院
出 处: 《电视技术》 2005年第2期36-38,共3页
摘 要: 介绍一种新的在0.25μm混合模拟工艺电路中使用没有任何外围元件的基准电流源设计电路。该电路基于一个带隙电压基准源(BandgapReference,BGR)和一个类似β乘法器的CMOS电路。其中β乘法器中的电阻用NMOS晶体管代替以获得具有负温度系数的基准电流源;同时,BGR电压的正温度系数抵消了β乘法器中负温度系数。使用Bsim3v3模型实验的仿真结果说明-20℃到+100℃温度范围内基准电流源最大波动幅度小于1%,1.4~3V电压范围内片上所有电阻具有±30%的容差。 A novel current reference with low temperature and supply sensitivity and without any external component has been developed in a 0.25 μm mixed-mode process. The circuit is based on a bandgap reference (BGR) voltage and a CMOS circuit similar to a β-multiplier. An NMOS transistor in triode region has been used in place of a resistor in conventional β-multiplier to achieve a current. The BGR voltage has a positive temperature coefficient to cancel the negative temperature coefficient of the β-multiplier. The simulation results using Bsim3v3 model show that the max-to-min fluctuation is less than 1% over a temperature range of -20°C to +100°C and a supply voltage range of 1.4 V to 1.3 V with 30% tolerance for all of the on-chip resistors.
关 键 词: 基准电流源 带隙电压基准源 温度系数 电路 乘法器
领 域: [电子电信]