A 19-nW 0.7-V CMOS Voltage Reference With No Amplifiers and No Clock Circuits

This brief provides a novel voltage reference circuit that uses four optimization techniques to effectively save power dissipation: 1) All the amplifiers have been eliminated, but two important voltages are still successfully equalized without using any amplifier; 2) the clock circuits are not required in the proposed design; 3) there is no need for extra biasing circuit; and 4) all the MOS transistors are in the subthreshold region to make the power supply voltage low. Moreover, a trimming circuit has been adopted to ensure the accuracy of the reference voltage. This novel voltage reference circuit has been fabricated with the Semiconductor Manufacturing International Corporation 0.18-μm 1.8-V CMOS process. The measurement results show that the power consumption is only 19 nW, the power supply voltage is only 700 mV, the temperature coefficient is 22.11 ppm/°C under a temperature of -25 °C-+85 °C, and the line sensitivity is as good as 571 μV/V.