A new high order CMOS temperature compensated current reference is proposed in this paper, which is accomplished by two first order temperature compensation current references. The novel circuit exploits the temperatu...A new high order CMOS temperature compensated current reference is proposed in this paper, which is accomplished by two first order temperature compensation current references. The novel circuit exploits the temperature characteristics of integrated-circuit resistors and gate-source voltage of MOS transistors working in weak inversion. The proposed circuit, designed with a 0.6 Izm standard CMOS technology, gives a good temperature coefficient of 31ppm/℃ [-50-100℃] at a 1.8V supply, and also achieves line regulation of 0.01%/V and-120dB PSR at 1 MHz. Comparing with other presented work, the proposed circuit shows better temperature coefficient and Line regulation.展开更多
基于前置放大器对于高稳定性基准电流源的需求,设计了一种结构简单、对温度不敏感、有较高电压稳定性的三支路基准源电路。利用与绝对温度成比例(Proportional to Absolute Temperature,PTAT)和与绝对温度互补变化(Complementary to Abs...基于前置放大器对于高稳定性基准电流源的需求,设计了一种结构简单、对温度不敏感、有较高电压稳定性的三支路基准源电路。利用与绝对温度成比例(Proportional to Absolute Temperature,PTAT)和与绝对温度互补变化(Complementary to Absolute Temperature,CTAT)的电流产生一个对温度不敏感的电流。同时,利用第三支路产生的电压增益形成的负反馈回路来提高电路的稳定性,减少电源电压波动对输出电流产生的影响。对电流源集成电路拓扑结构进行前仿和后仿,结果表明:当电源电压供电5 V时,在-25~145℃,温度系数较低;在0~15.8 kHz范围内,电源抑制比(Power Supply Rejection Ratio,PSRR)为-80 dB左右;整体静态电流仅为20μA。该拓扑结构在设计低温漂高电源抑制比方面具有非常好的效果,并且可以很好的为前置放大器提供稳定的工作电流。展开更多
文摘A new high order CMOS temperature compensated current reference is proposed in this paper, which is accomplished by two first order temperature compensation current references. The novel circuit exploits the temperature characteristics of integrated-circuit resistors and gate-source voltage of MOS transistors working in weak inversion. The proposed circuit, designed with a 0.6 Izm standard CMOS technology, gives a good temperature coefficient of 31ppm/℃ [-50-100℃] at a 1.8V supply, and also achieves line regulation of 0.01%/V and-120dB PSR at 1 MHz. Comparing with other presented work, the proposed circuit shows better temperature coefficient and Line regulation.
