A method includes generating a first current through a first node based on a differential pair of signals received by a differential pair of input nodes of a differential circuit of a first integrated circuit die of an isolator product. The method includes generating a second current through a second node. The second current matches the first current through the first node and is based on an attenuated version of an output measurement signal. The method includes generating the output measurement signal having a level corresponding to an average amplitude of the differential pair of signals based on the first current and the second current.