Title :
A new design technique for rail-to-rail amplifiers
Author :
Amourah, Mezyad M. ; Malik, Saqib Q. ; Geiger, Randall L.
Author_Institution :
nVidia Inc., Santa Clara, CA
Abstract :
A design technique for rail-to-rail operational amplifiers is presented. The technique adds dummy pairs to sense the common mode range of the input differential pair and adjusts the output current accordingly. An amplifier built in the TSMC 0.25mu process shows a DC gain of approximately 84dB. The amplifier provides high gain for a wider range of output voltages. Design considerations for reducing the impact of the additional circuitry on the core are provided. The technique described can be adapted for use with traditional fully-differential rail-to-rail amplifiers
Keywords :
differential amplifiers; network synthesis; operational amplifiers; 84 dB; common mode range; fully-differential rail-to-rail amplifiers; input differential pair; rail-to-rail operational amplifiers; Analog circuits; CMOS process; Digital circuits; Heart; MOSFETs; Operational amplifiers; Rail to rail amplifiers; Rail to rail inputs; Rail to rail operation; Threshold voltage;
Conference_Titel :
Circuits and Systems, 2005. 48th Midwest Symposium on
Conference_Location :
Covington, KY
Print_ISBN :
0-7803-9197-7
DOI :
10.1109/MWSCAS.2005.1594089
