The frequency of GIS partial discharge signal is as high as several GHz

so the real-time sampling is of high cost. It’s envelope signal contains fault characteristics of the partial discharge.Using a detection circuit to get the envelope and then analyzing it can greatly reduce the requirements for the sampling system.In this paper

an ultra-high frequency envelope detection circuit was designed on the basis of high-frequency characteristics of the high frequency detection diodes.Simulation via the software ADS and real test indicate that this detection circuit achieves satisfactory envelop extraction in the research of GIS partial discharge diagnostics.