VposVneg

VposVneg is a shorthand notation encountered in electronics contexts to refer to a system’s positive and negative supply voltages. The expression is not a formal standard; its exact meaning depends on the author, catalog, or design document, but it generally concerns the rails that power a circuit.

In a dual-supply arrangement, Vpos denotes the voltage of the positive rail with respect to a common reference (often ground), while Vneg denotes the voltage of the negative rail (which may be negative relative to ground). The term VposVneg can refer to either the pair (Vpos, Vneg) or to the differential span Vpos − Vneg, i.e., the total supply voltage available to the circuit.

The choice of Vpos and Vneg influences circuit behavior, including headroom, bias points, common-mode ranges, and noise performance. Components such as op-amps, ADCs, and voltage references specify requirements tied to the rails, and designers monitor Vpos and Vneg to ensure values remain within tolerance during operation.

In practice, VposVneg is distinct from ground potential. Some designs use ground at mid-rail, while others reference ground to one of the rails. In single-supply configurations, Vneg may be ground, making VposVneg equivalent to the single positive supply voltage.

Because VposVneg is not a standardized term, readers should interpret it from the surrounding context, schematics, or datasheets to determine whether it refers to the rail pair or to their differential voltage.