Patent ID: 6525584
Filing Date: 2003-02-25
Classification: H03K

Abstract:
A phase interpolator for controlling a delay time of an output signal from a first and a second signal having different phase delays comprising:a plurality of delay stages connected serially to each other and having a same internal structure, for determining corresponding axes for interpolation in each stage, wherein each of the plurality of delay stages comprises: a first inverting section for inverting a first input signal and a second input signal inputted from a previous stage and thereafter outputting a first output signal and a second output signal; a phase blender for generating a phase blending signal by phase blending the first and second output signals of the first inverting section; a second inverting section for inverting the first and second output signals of the first inverting section and outputting a third output signal and a fourth output signal; and a multiplexer for generating a fifth output signal and a sixth output signal for determining phase delay time of the output signal of the phase interpolator by selecting one of the third and fourth output signals and the phase blending signal as axes for interpolation in response to a select signal, wherein the fifth and sixth output signals are input signals for a next stage, and wherein one of the fifth and sixth output signals outputted from the multiplexer of a last delay stage is used as the output signal of the phase interpolator.