| 摘要 |
A device for measuring the ratio between a first capacitor and a second capacitor in which first and second switches are provided for selectively conducting a signal, therethrough based on a control signal. A capacity switching device receives the two capacitors, and includes a third switch for switching between these two capacitors. A control device controls the first and second switches to conduct in phase opposition to one another, and the third switch to connect the first and second capacitors separately and successively between the first and second switches. An integrator is connected to the output of the capacity switching device to integrate the output signal, and a capacity ratio measuring circuit is provided to detect the capacity ratio. In this way, detection of capacity ratio can be performed independent of the switching currents for the switches, the biasing current for the integrating amplifier, and any other biasing currents.
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