Editing Transconductance (section)

=== Transresistance amplifiers ===
{{Main article|transimpedance amplifier}}
A '''transresistance amplifier''' outputs a voltage proportional to its input current. The transresistance amplifier is often referred to as a '''transimpedance amplifier''', especially by semiconductor manufacturers.

The term for a transresistance amplifier in network analysis is ''current controlled voltage source'' (''CCVS'').

A basic inverting transresistance amplifier can be built from an [[operational amplifier]] and a single resistor. Simply connect the resistor between the output and the inverting input of the operational amplifier and connect the non-inverting input to ground. The output voltage will then be proportional to the input current at the inverting input, decreasing with increasing input current and vice versa. 

Specialist chip transresistance (transimpedance) amplifiers are widely used for amplifying the signal current from photo diodes at the receiving end of ultra high speed fibre optic links.