| 摘要 |
Provided is a detection sensor that uses an unconventional FM detection circuit to detect frequency modulation with high quality. The detection sensor is provided with: a detection circuit 100 that has a first inductor 12, which is connected to two opened input ends 11a, 11b and detects, at each of the input ends 11a, 11b, an external signal having a waveform with a gradient; and an output circuit 200 that has a second inductor 21 that is magnetically coupled with the first inductor 12, which serves as the primary side. In the output circuit 200, a third inductor 23 that constitutes a delay circuit, one end of which is connected to an intermediate tap of the second inductor 21, is connected; diodes 24a, 24b are respectively connected, in the forward direction, to the terminals 21a, 21b of the second inductor 21; and other terminals 25a, 25b respectively of the diodes 24a, 24b are connected to another terminal 26 of the third inductor via elements 27a, 27b, 28a, 28b that each have impedance properties. The output circuit 200 outputs,from the other terminals 25a, 25b of the diodes, a detection signal that is detected at the input ends 11a, 11b. |
