Title :
Low voltage rail-to-rail operational amplifier based on flipped voltage followers
Author :
Padilla, Ivan ; Ramirez-Angulo, Jaime ; Carvajal, Ramon G. ; Lopez-Martin, Antonio
Author_Institution :
Klipsch Sch. of Electr. & Comput. Eng., New Mexico State Univ., Las Cruces, NM, USA
Abstract :
A low voltage differential pair or flipped differential pair is presented. The design of a rail to rail op-amp with an input stage using complementary flipped differential pairs and a novel gm control circuit is discussed. Simulation results in 0.5μm CMOS technology with nominal PMOS and NMOS threshold voltages of 0.75V and -0.95V show input/output rail-to-rail operation with a 1.9V single supply. This supply is two drain-source saturation voltages lower than for rail op amp using conventional complementary differential pairs.
Keywords :
CMOS analogue integrated circuits; differential amplifiers; low-power electronics; operational amplifiers; -0.95 V; 0.5 micron; 0.75 V; 1.9 V; CMOS technology; NMOS threshold voltage; PMOS threshold voltage; complementary flipped differential pairs; flipped voltage followers; rail-to-rail operational amplifier; CMOS technology; Circuits; Low voltage; MOS devices; Operational amplifiers; Rail to rail amplifiers; Rail to rail inputs; Rail to rail operation; Threshold voltage; Transconductance;
Conference_Titel :
Circuits and Systems, 2005. 48th Midwest Symposium on
Print_ISBN :
0-7803-9197-7
DOI :
10.1109/MWSCAS.2005.1594090
