To provide a detection device which is adjustable in sensitivity, a sensor device, and an electronic apparatus.
The detection device includes a pyroelectric element 10, a sensitivity adjustment circuit 30 which is connected to the pyroelectric element 10 and adjusts the voltage sensitivity for the output voltage of the pyroelectric element 10, and a detection circuit 20 which is connected to the pyroelectric element 10. The sensitivity adjustment circuit 30 includes a variable capacity circuit 40 for sensitivity adjustment, and further includes a variable resistance circuit 50 which is connected in parallel with the variable capacity circuit 40. The resistance value of the variable resistance circuit 50 is set to a large value when the capacity value of the variable capacity circuit 40 is set to a small value, or to a small value when the capacity value of the variable capacity circuit 40 is set to a large value.
Osamu Suzawa
Kazuhiko Miyasaka
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