mVni

mVni is a term that has appeared in niche electronics and neural engineering discussions as a potential acronym with different meanings depending on context. Because it lacks a formal standard, its exact definition varies, and readers should rely on the specific source for interpretation.

One common informal usage is mVni to signify millivolt neural interface. In this sense, it refers to devices designed to interact with neural tissue using signals on the millivolt scale. Such interfaces may record neural activity or deliver electrical stimulation through microelectrodes. The emphasis on millivolt-scale signals highlights considerations like electrode impedance, biocompatibility, stimulation safety limits, signal bandwidth, and shielding from electrical noise. Note that real-world neural interfaces span a range of voltages and are not governed by a single, universal mVni standard.

Another proposed meaning is millivolt noise immunity. Here, mVni would be a metric describing how much input noise in millivolts a system can tolerate before performance degrades beyond a specified criterion. This concept relates to input-referred noise, signal-to-noise ratio, and power-supply rejection. However, mVni is not an established measurement in standard practice, and definitions vary between proposals, researchers, and communities.

Origins of the term appear in informal online discussions and speculative design notes in the 2020s. It has not achieved formal adoption or formal technical standardization, and it is important to interpret it within the context in which it is used.

See also: neural interfaces, electrode impedance, signal-to-noise ratio, input-referred noise, power-supply rejection.