This paper proposes a low power voltage reference generator in 0.18μm CMOS technology. The circuit presented here includes MOSFETs in sub threshold mode and uses the temperature dependence of threshold voltages and sub-threshold current of MOSFET to form a temperature-insensitive reference. An input supply voltage of 1.8 Volt is used for the circuit generating a total current of 1.33μA. By varying the device temperature over the range of -20°C to 100°C corresponding variation over the output voltage was found to lie in the range 397.8 to 400.2 mV. Thus a 0.6\% variation in voltage over the considered range of temperature is obtained. © (2013) Trans Tech Publications, Switzerland.