Synchronous phase to voltage converter for true-phase polarimeters

This paper describes a front-end electronics designed to process the signals generated by a true-phase polarimeter. The design of the network is oriented to minimize the phase angle measurement uncertainty. The circuit has been accordingly developed and tested in operation. Exploiting a precise analogue phase-to-voltage converter based on a synchronous detection scheme, the network exhibits a phase angle measurement uncertainty less than 0.35 mdeg. The circuit exhibits excellent rejection of uncorrelated noise, disturbances, offsets and harmonics.