A ultra low power dissipation CMOS bandgap reference

With the development of SoC in portable devices,low power consumption becomes more and more important.A low power dissipation and small area CMOS voltage reference without resistance,which is operated in subthreshold area,is presented.The circuit includes the characteristics of low power,which is feasible for ultra low power SoC.It has been designed and simulated in 0.18um standard CMOS process technology.The supply current of the above circuit is about 150nA and the line sensitivity is 44.4 ppm/V in a supply voltage range of 1.5V to 3.3V.When the supply voltage is 1.5V,the bandgap reference's output voltage is 1.1126V at room temperature,and the temperature coefficient of voltage is 55 ppm/V in a range from-20 to 80 ℃.The power supply rejection ratio(PSRR) is-66dB at 100Hz in a supply voltage of 1.5V.The occupied chip area of bandgap reference is 0.011mm2.