Apparatus and associated methods relate to a power supply noise disturbance rejection circuit (NDRC) having a first circuit reference potential (CRP1), a second circuit reference potential (CRP2), and a galvanic link conductively connecting CRP1 and CRP2 and providing a non-zero resistance return path for at least one current mode signal (CMS). In an illustrative example, a power supply monitor circuit (PSMC) may be referenced to CRP1 and a control circuit to CRP2. The PMSC may, for example, generate a voltage mode signal (VMS) relative to CRP1 and representing an output parameter of a power supply circuit (PSC), and convert the VMS into a first CMS (CMS1). The control circuit may, for example, generate a control signal for the PSC from CMS1. Various embodiments may advantageously attenuate a noise margin of a CMS presented at the control circuit by a factor of at least 10 relative to an equivalent VMS.
