# Transconductance

Transconductance , also known as slope , is a parameter for certain electronic components such as amplifiers . It indicates the ratio of an output current to an input voltage . This is a so-called small - signal parameter , since the transconductance is created by linearizing the transmission behavior at the operating point.

${\ displaystyle g _ {\ mathrm {m}} = {i _ {\ mathrm {out}} \ over u _ {\ mathrm {in}}}}$

It is in i out and u in to small signal sizes. With DC voltage one can also write:

${\ displaystyle g _ {\ mathrm {m}} = {\ Delta I _ {\ mathrm {out}} \ over \ Delta U _ {\ mathrm {in}}}}$