EMI FILTERING DETECTOR AND METHOD FOR SAME

摘要

A circuit for detecting electromagnetic radiation includes a pyroelectric sensor element connected to convert electromagnetic radiation into an electric signal. An n-channel junction field effect transistor is connected to receive the electric signal. A printed circuit board includes at least one low inductance low resistance area to provide a ground path for all alternating current components. A first capacitor is connected between the FET source terminal and a second capacitor is connected between the FET drain terminal and ground. A gate resistor is connected in parallel with the sensor element or a resistor is included in the sensor elements.