A low dropout voltage regulator with enhanced transconductance error amplifier and small output voltage variations

Ebrahim Abiri, Mohammad Reza Salehi, Sara Mohammadalinejadi
2013 2013 21st Iranian Conference on Electrical Engineering (ICEE)  
A low dropout (LDO) voltage regulator with small output voltage variations and the ability of wide load current range support is proposed in this paper. In this LDO structure, a recycling folded cascode operational transconductance amplifier (RFC OTA) is used as an error amplifier, which has high transconductance and therefore high power efficiency. The designed LDO is simulated in 0.18 μm CMOS standard technology and has small output voltage variations about 48 mV for load current in the range
more » ... of 0-150 mA. Simulation results show a favorable transient response behavior with 4.2 μs rise time and 160mV dropout voltage for current changing in the desirable range. It is shown that the LDO can support 0-150 mA load current range with reasonable output voltage variations. In addition, with the smaller load current ranges, the dropout voltage will be higher and the output voltage variations will be smaller.
doi:10.1109/iraniancee.2013.6599866 fatcat:ww64t7acsvaytmqtgddogcznbe