Luis Hernandez Enrique Prefasi S. Paton Pieter Rombouts Synthesis of sigma delta modulators employing continuous time delays. 4070-4073 2005 conf/iscas/2005 ISCAS (4) http://dx.doi.org/10.1109/ISCAS.2005.1465525 db/conf/iscas/iscas2005-4.html#HernandezPPR05