Design of a wideband signal detection circuit for electrical field sensor

Electrical field sensors are widely used for detecting transient signal in the EMC tests. The traditional method to detect the electrical field sensor signal is single-path detection using spectrum analyzer, which is applicable when the frequency is known. But if the signal is transient during the EMC tests, it often needs to sweep multiple times to detect different frequency points, or test multiple times to get the field at different locations. In this paper, a new method is proposed innovatively for detecting the electrical field sensor signal with wideband signal detection circuit. This circuit consists of a wideband low noise amplifier module and a wideband peak detector module. By using a wideband LNA module, this circuit can achieve high sensitivity detection. And by using a wideband peak detector module, it can realize simultaneous detection of wideband signals. The detailed design of the two modules is shown in this paper. After simulation and testing, it`s proved that the two modules could reach the established targets, and the wideband signal detection circuit can be used for the detection of wideband electrical field sensor signal in EMC tests.