Patent ID: 8981838
Filing Date: 2015-03-17
Classification: H02M

Abstract:
1. A half-ratio charge pump circuit, comprising: a flying capacitor electrically coupled between a first node and a second node; eight switches including first to eighth switches controlled to carry out first to fourth operating phases during which charges are stored on and transferred from the flying capacitor; a first reservoir capacitor electrically coupled to the first node via the third switch; and a second reservoir capacitor electrically coupled to the second node via the fourth switch; wherein a positive input voltage is electrically coupled to the first node via the first switch, a negative input voltage is electrically coupled to the second node via the second switch, the first node is electrically coupled to ground via the fifth switch, the second node is electrically coupled to ground via the sixth switch, the first node provides a positive output voltage via the seventh switch, and the second node provides a negative output voltage via the eighth switch, thereby generating the positive output voltage at approximately half the positive input voltage, and generating the negative output voltage at approximately half the negative input voltage.