A new circuit solution able to increase the output impedance of a CMOS current source is proposed here. Since the technique does not rely on series feedback applied at the output, as usually happens, it is suitable to be employed for very low voltage analog circuits in deep submicron technologies. Performance similar to cascoded current sources can be achieved, without requiring huge length MOS transistors. The proposed approach can be successfully applied to the tail current of differential stages in order to improve their common mode rejection performance, whilst preserving the input common mode dynamic range.
An Improved Low Voltage CMOS Current Source Exploiting Positive Shunt Feedback / Tauro, A.; Di Ciano, M.; Marzocca, Cristoforo. - (2005). (Intervento presentato al convegno 12th IEEE International Conference on Electronics, Circuits and Systems, ICECS 2005 tenutosi a Gammarth, Tunisia nel December 11-14, 2005) [10.1109/ICECS.2005.4633589].
An Improved Low Voltage CMOS Current Source Exploiting Positive Shunt Feedback
MARZOCCA, Cristoforo
2005-01-01
Abstract
A new circuit solution able to increase the output impedance of a CMOS current source is proposed here. Since the technique does not rely on series feedback applied at the output, as usually happens, it is suitable to be employed for very low voltage analog circuits in deep submicron technologies. Performance similar to cascoded current sources can be achieved, without requiring huge length MOS transistors. The proposed approach can be successfully applied to the tail current of differential stages in order to improve their common mode rejection performance, whilst preserving the input common mode dynamic range.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
