Title :
A low voltage CMOS current source
Author :
Schmitt, Detlev ; Fiez, Terri S.
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Washington State Univ., Pullman, WA, USA
Abstract :
A low voltage current source is described that has a minimum input voltage of less than 0.1 V and a minimum output voltage swing of 0.2 V. Although this current source has an output voltage range equivalent to a simple current mirror, the output resistance is amplified by a feedback amplifier to produce an output resistance on the order of a cascode current source. The low voltage current source was fabricated in a 2 micron n-well CMOS process. The measured minimum output voltage is 0.2 V and the measured output resistance is 11 M/spl Omega/. Using this current source, a 1.8 V folded-cascode op amp was designed. The simulated open loop gain was 50 dB with a nearly rail-to-rail output linear range.
Keywords :
CMOS analogue integrated circuits; circuit feedback; constant current sources; differential amplifiers; feedback amplifiers; operational amplifiers; 0.1 V; 0.2 V; 1.8 V; 11 Mohm; 2 micron; 50 dB; LV operation; feedback amplifier; folded-cascode op amp; low voltage CMOS current source; n-well CMOS process; op amp; output resistance; rail-to-rail output linear range; Differential amplifiers; Electrical resistance measurement; Feedback amplifiers; Integrated circuit measurements; Low voltage; Mirrors; Operational amplifiers; Permission; Power supplies; Threshold voltage;
Conference_Titel :
Low Power Electronics and Design, 1997. Proceedings., 1997 International Symposium on
Conference_Location :
Monterey, CA, USA
Print_ISBN :
0-89791-903-3
