Title :
High-PSRR low-power single supply OTA
Author :
Sobhy, E.A. ; Hoyos, Sebastian ; Sanchez-Sinencio, Edgar
Author_Institution :
Dept. of Electr. & Comput. Eng., Texas A&M Univ., College Station, TX, USA
Abstract :
A CMOS single supply operational transconductance amplifier (OTA) is reported. It has high power supply rejection capabilities over the entire gain bandwidth. The OTA is fabricated using the AMI 0.5 m CMOS process. Measurements show power supply rejection ratio (PSRR) of 120 dB to 10 kHz. At 10 MHz, PSRR is 40 dB. The high performance PSRR is achieved using a high impedance current source and two noise reduction techniques. The OTA offers very low current consumption of 25 A from a 3.3 V supply. It is suitable for applications such as low drop out voltage regulators.
Keywords :
CMOS analogue integrated circuits; operational amplifiers; CMOS single supply operational transconductance amplifier; current 25 muA; frequency 10 MHz; high impedance current source; low drop out voltage regulators; low-power single supply OTA; noise figure 120 dB; noise reduction techniques; power supply rejection capabilities; power supply rejection ratio; size 0.5 mum; voltage 3.3 V;
Journal_Title :
Electronics Letters
DOI :
10.1049/el.2010.3455
