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

fYear

2013

fDate

14-16 May 2013

Firstpage

1

Lastpage

5

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Engineering (ICEE), 2013 21st Iranian Conference on

Conference_Location

Mashhad

Type

conf

DOI

10.1109/IranianCEE.2013.6599866

Filename

6599866