PHASE INTERPOLATOR FOR CONTROLLING OUTPUT DELAY PERIOD BY SWING WIDTH OF INPUT SIGNALS OUTPUTTING INTERPOLATION SIGNAL HAVING REDUCED JITTER COMPONENT

摘要

PURPOSE: A phase interpolator for controlling an output delay period is provided to prevent a change of phases of interpolation signals by reducing a time jitter. CONSTITUTION: A plurality of swing width control circuits(160,170) are used for receiving input signals and outputting swing signals having predetermined swing width in response to predetermined current control signals. A phase interpolation circuit(150) is used for outputting interpolation signals in response to the swing signals. The swing width of the swing signals is changed according to a change of levels of the current control signals. The phase interpolation circuit changes the phase of the interpolation signal when the swing width of the swing signals is changed.