Apparatus and method for generating circuit clock signal

A method for generating a circuit clock signal, comprising:

• buffering an original clock signal to obtain a buffered clock signal;
• delaying the original clock signal to obtain a plurality of delayed clock signals, the plurality of delayed clock signals being respectively delayed by different amounts of time relative to the original clock signal;
• generating a broadened clock signal based on the original clock signal and the plurality of delayed clock signals, the frequency of the broadened clock signal being lower than that of the original clock signal;
• and
• selecting one of the buffered clock signal and the broadened clock signal as the circuit clock signal based on a selection signal,
• wherein the generating the broadened clock signal based on the original clock signal and the plurality of delayed clock signals comprises:
• cyclically selecting, by a signal selecting unit, a clock signal from the original clock signal and the plurality of delayed clock signals in a predetermined order;
• and
• generating, by a clock broadening unit, the broadened clock signal based on the clock signal selected by the signal selecting unit, and
• wherein the cyclically selecting, by a signal selecting unit, the clock signal from the original clock signal and the plurality of delayed clock signals in a predetermined order comprises:
• controlling, by a switch matrix control unit, a plurality of switches of a switch matrix to be cyclically turned on in sequence based on an enable signal, so that the original clock signal and the plurality of delayed clock signals are selected by the signal selecting unit in the predetermined order, wherein one end of each of the plurality of switches is coupled to the clock delay unit to receive a corresponding clock signal among the original clock signal and the plurality of delayed clock signals, the other end of each of the plurality of switches is coupled to the clock broadening unit to provide the clock signal selected by the signal selecting unit to the clock broadening unit.