Patent ID: 8923466
Filing Date: 2014-12-30
Classification: H04L

Abstract:
1. A multi-phase clock switching device, comprising: at least a phase selection circuit, comprising: a first phase selection circuit, for receiving a current phase clock signal and a previous one phase clock signal, and determining how to output the current phase clock signal to be an output signal according to a switching signal wherein the first phase selection circuit comprises: a selection unit, for receiving the current phase clock signal and determining how to output the current phase clock signal according to the current phase clock signal and a selection signal; and a protection unit, generating the selection signal according to a voltage level of the current phase clock signal and the switching signal; wherein, if the current phase clock signal is at a first voltage level and the previous one phase clock signal is at a second voltage level, the protection unit disables or does not output the selection signal and the selection unit does not output the current phase clock signal; if the current phase clock signal and the previous one phase clock signal are both equal to the second voltage level, the protection unit enables or outputs the selection signal and the selection unit outputs the current phase clock signal to generate the output signal.