Title :
A programmable rail-to-rail constant-gm input structure for LV amplifier
Author :
Yan, Shouli ; Sánchez-Sinencio, Edgar
Author_Institution :
Dept. of Electr. Eng., Texas A&M Univ., College Station, TX, USA
Abstract :
We proposed a novel technique for low voltage rail-to-rail constant-gm input stages, which does not depend on the operation regions of the MOS transistors. An op amp was designed to demonstrate the new idea using MOSIS AMJ 1.2 μm technology. A 2.5 MHz unity-gain bandwidth with 61° phase margin was achieved when driving 10 kΩ and 10 pF load, with 240 μA current consumption and a power supply of 3 V. The gm variation of the input stage is within ±3% from rail-to-rail. By changing the bias current, the unity-gain bandwidth could be programmed from 90 kHz to 3 MHz
Keywords :
CMOS analogue integrated circuits; low-power electronics; operational amplifiers; programmable circuits; 1.2 micron; 2.5 MHz; 240 muA; 3 V; 90 kHz to 3 MHz; CMOS op amp; LV amplifier; MOS transistors; MOSIS AMJ technology; bias current adjustment; constant-gm input structure; low voltage operation; opamp input stage; programmable rail-to-rail input structure; programmable unity-gain bandwidth; Bandwidth; Circuit simulation; Equations; MOSFETs; Mirrors; Operational amplifiers; Rail to rail amplifiers; Rail to rail inputs; Switches; Voltage;
Conference_Titel :
Circuits and Systems, 2000. Proceedings. ISCAS 2000 Geneva. The 2000 IEEE International Symposium on
Conference_Location :
Geneva
Print_ISBN :
0-7803-5482-6
DOI :
10.1109/ISCAS.2000.857543
