Meaning
A electrical transport behavior exhibits a non-linear relationship between applied voltage and resulting electric current across a material interface or component. The phenomenon of non-ohmic conduction arises when potential barriers, oxide layers, or space-charge regions alter carrier mobility under changing electric fields. The regime of non-linear behavior stops when applied electric fields remain sufficiently small that first-order linear approximations hold true.
Transport Mechanisms
Conduction pathways across microscopic metal contacts rely on thermionic emission, Schottky transport, or quantum tunneling through thin surface contaminants. When non-ohmic conduction occurs, current increases non-linearly with applied voltage, departing from simple resistance relationships defined by Ohm’s law.
Signal Distortion
Non-linear voltage-current curves act as mixer circuits when driven by high-power multi-tone radio signals. Non-ohmic conduction in passive interconnections generates harmonic frequency components and passive intermodulation products that fall directly into sensitive receive bands. Eliminating oxide layers and maximizing contact force converts non-linear junctions into linear metallic interfaces, preserving receiver dynamic range across base station hardware.
Spectrum analyzers measure generated harmonic power to evaluate contact linearity.
Device Characterization
Measurement systems record current-voltage traces across fine voltage steps to detect non-linear transport in test samples. Identifying non-ohmic conduction involves calculating dynamic differential resistance across positive and negative bias ranges. Test reports certify interface linearity across specified current ranges.
