Yejoong Kim Yoonmyung Lee Dennis Sylvester David T. Blaauw SLC: Split-control Level Converter for dense and stable wide-range voltage conversion. 478-481 2012 ESSCIRC https://doi.org/10.1109/ESSCIRC.2012.6341359 conf/esscirc/2012 db/conf/esscirc/esscirc2012.html#KimLSB12