Title :
A low dropout voltage regulator with enhanced transconductance error amplifier and small output voltage variations
Author :
Abiri, Ebrahim ; Salehi, Mohammad Reza ; Mohammadalinejadi, Sara
Author_Institution :
Dept. of Electr. Eng., Shiraz Univ. of Technol., Shiraz, Iran
Abstract :
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 design, a recycling folded cascode operational transconductance amplifier (RFC OTA) is used as an error amplifier. This OTA structure has high transconductance and therefore high power efficiency. The designed LDO is simulated in 0.18 CMOS standard technology and has small output voltage variations about 9 mV for load current in the range of 0-50 mA. Simulation results show a favorable transient response behavior with 1.2 μs rise time and 183 mV dropout voltage for current changing in the desirable range. It´s shown that the LDO structure 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.
Keywords :
CMOS analogue integrated circuits; operational amplifiers; transient response; voltage regulators; CMOS standard technology; LDO design; LDO structure; LDO voltage regulator; RFC OTA; current 0 mA to 50 mA; high power efficiency; load current range support; low dropout voltage regulator; output voltage variations; recycling folded cascode operational transconductance amplifier; size 0.18 mum; time 1.2 mus; transconductance error amplifier; transient response behavior; voltage 183 mV; Noise; Power demand; Regulators; Transconductance; Transient response; Transistors; Voltage control; buffer; load current changes; low noise; power consumption; transient response;
Conference_Titel :
Electrical Engineering (ICEE), 2013 21st Iranian Conference on
Conference_Location :
Mashhad
DOI :
10.1109/IranianCEE.2013.6599866
