Patent ID: 7253764
Filing Date: 2007-08-07
Classification: H03M

Abstract:
1. A reference voltage generating circuit for generating a reference voltage according to a predetermined voltage, the reference voltage generating circuit comprising: a first capacitor; a second capacitor; a reference voltage sampling capacitor; a first switch, for alternatively coupling the second capacitor to the predetermined voltage, wherein the first switch couples the second capacitor to the predetermined voltage in a first stage such that the second capacitor samples the predetermined voltage; a second switch, for alternatively coupling the second capacitor to the first capacitor, wherein the second switch couples the second capacitor to the first capacitor in a second stage in order to generate the reference voltage; and a third switch, for alternatively coupling the first capacitor to the reference voltage sampling capacitor, wherein the third switch couples the first capacitor to the reference voltage sampling capacitor in the first stage such that the reference voltage sampling capacitor redistributes charges with the first capacitor to generate the reference voltage.