Validating an Isolator to eliminate grounding issues for high-resolution digitizer measurements
Peter N. Davis, Paul Wright · IEEE Transactions on Instrumentation and Measurement · 2021
This article describes a method of isolating high-resolution digitizers that have a common ground between channels. Isolation enables the digitizers to be used simultaneously to measure multiple points in a circuit without short-circuiting via the common ground. The isolators, when used in a switch formation, provide a method to cancel out the phase angle errors when measuring the difference in phase angles between channels. Various tests are reported, which assess the performance of the isolator over its operating range. These include temperature coefficient, linearity, gain stability common-mode rejection, and crosstalk.