Patent ID: 7495480
Filing Date: 2009-02-24
Classification: G09G,G11C,H03F

Abstract:
1. A compensating circuit for calibrating reference voltage coupled to an operation amplifier having an input end with two input terminals and an output end, the compensating circuit connecting to the two input terminals comprising: a first capacitor for storing a potential of the reference voltage; a second capacitor coupled to the operation amplifier; a first switch electrically connected to the first capacitor and the second capacitor; a second switch having one end thereof electrically coupled to the first capacitor and another end thereof electrically coupled to the input end of the operation amplifier, a third switch electrically coupled to the second capacitor and the input end of the operation amplifier; and a fourth switch electrically coupled to the second capacitor and the output end of the operation amplifier, wherein when turning on the first switch and turning off the third switch and the fourth switch, the potentials stored in the first capacitor and the second capacitor, respectively, are combined and input to the operation amplifier.