Method and apparatus for removing digital glitches

A method of removing glitches in a clock signal caused by noise or interference, said method comprising the steps of:

• receiving said clock signal;
• monitoring said clock signal to determine if a transition has occurred in said clock signal;
• initiating a count when a first transition in said clock signal is detected;
• outputting said first transition as a valid transition in said clock signal if said count reaches a predetermined number;
• and
• resetting said count if a second transition is detected prior to said count equaling said predetermined number.

An apparatus for removing glitches from a first clock signal and outputting a glitch-free clock signal, said apparatus comprising:

• a counter for maintaining a count;
• a first comparator for receiving and sampling said first clock signal and comparing a current value of said first clock signal with said a previous value of said first clock signal wherein said first comparator resets said count of said counter if said current value of said first clock signal does not equal said previous value of said first clock signal;
• and
• a second comparator for comparing said count to a count compare value and outputting a transition in a glitch-free clock output if said count equals said count compare value and resetting said count when said count equals said count compare value.