Patent ID: 6873216

Claim:
A chattering eliminating apparatus comprising: a coincidence circuit for receiving an input signal of said apparatus and an output signal of said apparatus to determine whether or not a level of the input signal of said apparatus is the same as a level of the output signal of said apparatus; an oscillation circuit, connected to said coincidence circuit, for carrying out an oscillation operation only when the level of the input signal of said apparatus is not the same as the level of the output signal of said apparatus; a counter, connected to said oscillation circuit, for counting an output signal of said oscillation circuit, said counter being reset when the level of the input signal of said apparatus is the same as the level of the output signal of said apparatus; an output signal generating circuit, connected to said counter, for inverting the level of the output signal of said apparatus when a counter value of said counter reaches a predetermined value; and wherein said oscillation circuit has a capacitor used to carry out said oscillation operation and said oscillation operation is not subject to a duty ratio of a chattering phenomenon.