Patent ID: 7728646

Claim:
A source follower, comprising: a first switch, having a first end for receiving an input signal; a second switch, having a first end coupled with a first voltage; a first transistor, having a source coupled to a second end of the first switch, and a gate and a drain coupled to a second end of the second switch; a first capacitor, having a first end for receiving a first control signal, and a second end coupled to the drain of the first transistor; a third switch, having a first end coupled with the first voltage; and a second transistor, having a gate and a drain respectively coupled to the second end of the first capacitor and a second end of the third switch, and a source serving as an output of the source follower, wherein during a first period, the first and the third switch are turned on, and the first control signal is at a first level; during a second period, the second switch is turned on for a first predetermined time duration, the first control signal changes from the first level to a second level, and sustains for a second predetermined time duration; the first and the second predetermined time duration are partially overlapped, and an end time of the second predetermined time duration is after an end time of the first predetermined time duration.