De-glitch circuit

A de-glitch circuit with has a plurality of signal transmission unit is provided. These signal transmission units is formed a signal transmission unit string in series connected to each other, which the first signal transmission unit received a digital signal. Each of signal transmission unit includes a first switch, a first delay circuit and a second switch. A first end of the first switch is coupled a previous signal transmission unit of the signal transmission unit string. An input end of the first delay circuit is coupled a second end of the first end. The second switch is coupled between an output end of the first delay circuit and a first voltage. When the digital signal transitive to a first logical, the first switch is off, and the second is on. When the digital signal transitive to a second logical, the first switch is on, and the second is off.