Capacitance phase interpolation circuit and method thereof, and multi-phase generator applying the same

摘要

A capacitance phase interpolation circuit including a first capacitance phase interpolation unit and a second capacitance phase interpolation unit is disclosed. The first capacitance phase interpolation unit includes a first capacitance group, wherein a plurality of capacitors in the first capacitance group are in a ring coupling, and the first capacitance phase interpolation unit receives a plurality of reference clock signals. The second capacitance phase interpolation unit is coupled to the first capacitance phase interpolation unit and includes a second capacitance group, wherein a plurality of capacitors in the second capacitance group are in a ring coupling, and each of the output clock signals is obtained via the first capacitance phase interpolation unit and the second capacitance phase interpolation unit by performing phase interpolation on all the reference clock signals.

主权项

1. A capacitance phase interpolation circuit, comprising:
a first capacitance phase interpolation unit comprising a first capacitance group and receiving a plurality of reference clock signals, wherein a plurality of capacitors in the first capacitance group are in a ring coupling; and a second capacitance phase interpolation unit, coupled to the first capacitance phase interpolation unit and comprising a second capacitance group, wherein a plurality of capacitors in the second capacitance group are in a ring coupling; wherein each of output clock signals is obtained via the first capacitance phase interpolation unit and the second capacitance phase interpolation unit by performing phase interpolation on all the reference clock signals, and the first and second capacitance phase interpolation units do not include resistors.