OK thanks. I think the standard 478A sensor uses a tiny (and very thin) SMD disc cap of about 1350pF for the AC ground end of the thermistor. The later 478A sensor uses 1200pF here.? I don't know what package type is used for the series blocking cap at the input.
Because the sensor is designed for use to 10 GHz I think this capacitor will have relatively low package inductance compared to a regular MLCC in a 1206 package.
?
I'm not sure what package the 0.1uF caps use in the H72 but if they are allowed to be as large as a 1206 MLCC then maybe a MLCC with a class 1 COG dielectric can be used here. This might help explain why the upper frequency range is much lower for the H72 version.
?
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Regards
Jeremy
