DIGITAL PHASE-LOCKED LOOP FILTER

摘要

PURPOSE: To provide a digital PLL filter the filter coefficient (K) of which is periodically decremented between an initial value and a target value at every clock pulse. CONSTITUTION: A digital PLL filter performs multiplication at least one time by using filter coefficients K1 and K2 before the PLL filter outputs filtered signals by digitally processing incoming error signals θe at every clock pulse. The PLL filter incorporates a correcting means which incrementally corrects the values of the filter coefficients at every clock pulse during the initial operating period of the PLL filter.