Patent ID: 7911238
Filing Date: 2011-03-22
Classification: G06F,H03K

Abstract:
1. A method of using a switch circuit in-phase switching clock signals, wherein said switch circuit comprises a D flip-flop and a 2 to 1 multiplexer, said method comprising the steps of: receiving a first clock signal and a second clock signal by said 2 to 1 multiplexer; receiving a switch control signal by an input terminal of said D flip-flop, wherein said switch control signal is used to determine an output signal of said switch circuit; receiving a reference clock signal by a clock terminal of said D flip-flop, wherein a reference period of said reference clock signal is the least common multiple of a first period of said first clock signal and a second period of said second clock signal, and said first period is different from said second period; and selectively outputting said first clock signal or said second clock signal as said output signal of said switch circuit by said 2 to 1 multiplexer according to a selecting signal outputted from said D flip-flop, wherein said output signal of said switch circuit is switched from said first clock signal to said second clock signal when said reference clock signal is changed from a first voltage level to a second voltage level.