Design and implementation of a micro-power CMOS voltage reference circuit based on thermal compensation of Vgs

In this work a simple all MOS voltage reference circuit has been proposed. To obtain reference output voltage, the thermal compensation has been generated by using a series composite NMOSTs. The voltage reference circuit has been fabricated in a standard 0.18 mu m CMOS technology. The proposed circuit is capable of working for the supply voltage ranging from 1.25 V to 2 V. The maximum power dissipation of the proposed circuit is 0.48 mu W at the supply voltage of 2 V. The measurement has been performed over a set of 10 samples. It resulted in the mean temperature coefficient (TC) of 19.302 ppm/degrees C for the temperature range of -40 degrees C to 85 degrees C. The measured mean line sensitivity is 2217 mV/V for the supply voltage ranging from 125 V to 2 Vat the room temperature. The measured mean power supply rejection ratio at 10 Hz and 1 MHz is -55.31 dB and -16.67 dB respectively for the supply voltage of 1.8 V. Moreover, the measured mean noise density without any filtering capacitor at 100 Hz and 100 kHz are 12.39 mu V/root Hz and 0.39 mu V/root Hz respectively. Due to its simple circuit implementation, the active area of the circuit is 0.0077 mm(2). (C) 2014 Elsevier Ltd. All rights reserved.