Patent ID: 7545184

Claim:
An analog buffer for use in a source driver, wherein the analog buffer has an input end and an output end, and the input end is used to receive an input voltage, the analog buffer comprising: a transistor having a source electrically coupled to the output end, and a drain for receiving a first voltage; a current source for outputting a bias current to bias the transistor; a first switch having a first end and a second end, wherein the first end of the first switch receives a second voltage, the second end of the first switch is electrically coupled to the gate of the transistor, and the second voltage is independent of the input voltage; a first capacitor having a first end and a second end, wherein the first end of the first capacitor is electrically coupled to the gate of the transistor; a second capacitor having a first end and a second end, wherein the first end of the second capacitor is electrically coupled to the gate of the transistor; a second switch having a first end and a second end, wherein the first and the second ends of the second switch are electrically coupled to the input end and the second end of the first capacitor, respectively; a third switch having a first end and a second end, wherein the first and the second ends of the third switch are electrically coupled to the input end and the second end of the second capacitor, respectively; a fourth switch having a first end and a second end, wherein the first and the second ends of the fourth switch are electrically coupled to the second end of the first capacitor and the output end, respectively; and a fifth switch having a first end and a second end, wherein the first and the second ends of the fifth switch are electrically coupled to the second end of the second capacitor and the output end, respectively, wherein the first switch and the fourth switch are enabled and the second switch, the third switch and the fifth switch are disabled, in a first period; the second switch and the fifth switch are enabled and the first switch, the third switch and the fourth switch are disabled, in a second period that comes after the first period, and the third switch is enabled and the first switch, the second switch, the fourth switch, and the fifth switch are disabled, in a third period that comes after the second period.