The change of output electric current per change of input electric potential difference, evaluated at an operating point with the other terminal conditions specified. In a small-signal model, describes this contribution; transconductance has the dimensions of electrical conductance.
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Transconductance is an important parameter in the field of electronics, particularly in the study of amplifiers and other types of electronic circuits. It refers to the ratio of the output current of a device to the input voltage that causes it. Essentially, transconductance quantifies how effectively an input voltage can control the output current in a device like a transistor or an operational amplifier.