FLYING CAPACITOR TYPE VOLTAGE DETECTING CIRCUIT

摘要

PROBLEM TO BE SOLVED: To improve SN ratio of a flying capacitor type voltage detecting circuit detecting a voltage using a flying capacitor. SOLUTION: Signal lines L1 and L2 between both ends of the flying capacitor and a pair of input terminals of a differential amplifier circuit are connected to a reference potential source via next-stage capacitors 11 and 12 and potential setting resistance elements 7 and 8. Or, the lines are connected to the reference potential source via the next-stage capacitors 11 and 12 and reset switches 21 and 22. This constitution can improve the SN ratio of the signal voltage.