CAPACITY DETECTION CIRCUIT, SEMICONDUCTOR DEVICE, INPUT DEVICE USING THE SAME, ELECTRONIC APPARATUS, AND CAPACITY DETECTION METHOD

摘要

To provide a capacity detection circuit with which it is possible to solve at least one of conventional problems.SOLUTION: A control signal generator 110 generates a control signal. A drive circuit 120 includes a push-pull type of output stage 122 and applies a drive voltage that corresponds to the control signal generated by the control signal generator 110 to a capacitance Cs. A current detection circuit 130 generates a detection current that is a replica of a current flowing in the output stage 122 of the drive circuit 120. An integration circuit 140 integrates the detection current and generates a detection voltage.SELECTED DRAWING: Figure 3