LOOP FILTER AND A PHASE LOCKED LOOP COMPRISING THE SAME, PARTICULARLY FOR INCREASING ON-CHIP INTEGRATION BY REDUCING A CHIP AREA

摘要

PURPOSE: A loop filter and a phase locked loop comprising the same are provided to replace a first capacitor having a high value with the capacitor having a low value.;CONSTITUTION: A first filter path(331) filters first current applied to a first input node at first, and a second filter path(332) includes a second capacitor connected between a first input node and the ground. A second filter path secondly filters the first current applied to the first input node. A third filter path(333) includes a third capacitor connected between a third resistor and the ground of the output node, wherein the third resistor is connected between the first input node and an output node.;COPYRIGHT KIPO 2011