The paper studies the dynamics of a conventional
positive going zero crossing type digital phase locked loop
(ZC1-DPLL) taking non-ideal responses of the loop constituent
blocks into account. The finite width of the sampling pulses
and the finite propagation delay of the loop subsystems are
properly modeled mathematically and the system dynamics is
found to change because of their influence considered
separately. However, when these two are taken simultaneously,
the system dynamics can be made nearly equivalent to that of
the ideal system. Through an extensive numerical simulation
a set of optimum parameters to overcome design limitations
have been obtained.