| 摘要 |
A capacitance detecting apparatus, coupled to a capacitor to be measured, includes a first capacitor, a second capacitor, a control module and a judging module. The first and second capacitors are coupled to the capacitor to be measured via an input node. The control module provides a first voltage-drop variation to the first capacitor and a second voltage-drop variation to the capacitor to be measured to introduce a third voltage-drop variation to the second capacitor. The first and second voltage-drop variations cause charge flowing from the first capacitor to the input node have a same sign with charge flowing from the input node to the capacitor to be measured. The judging module determines capacitance of the capacitor to be measured according to capacitance of the first and second capacitors as well as the first, second and third voltage-drop variations. |
