| 摘要 |
PROBLEM TO BE SOLVED: To provide a physical quantity detection device, etc., capable of reducing the possibility of detection sensitivity declining even when a rotational vibration of a frequency close to the detuning frequency of a vibration element is applied.SOLUTION: A physical quantity detection device 400 includes a vibration element 100 and a detection circuit 450. The detection circuit 450 includes a sync detection circuit 456 for detecting, on the basis of a drive signal for driving the vibration element 100, a signal that corresponds to the physical quantity included in the output signal of the vibration element 100, and a filter circuit 454 provided at a stage preceding the sync detection circuit 456. The cut-off frequency of the filter circuit 454 lies between the drive-mode resonance frequency and the detection-mode resonance frequency of the vibration element 100, the drive-mode resonance frequency being included in a pass band. |
