The tetrode field-effect transistor or field-effect tetrode is a
solid-state
Solid state, or solid matter, is one of the four fundamental states of matter.
Solid state may also refer to:
Electronics
* Solid-state electronics, circuits built of solid materials
* Solid state ionics, study of ionic conductors and their use ...
semiconductor device
A semiconductor device is an electronic component that relies on the electronic properties of a semiconductor material (primarily silicon, germanium, and gallium arsenide, as well as organic semiconductors) for its function. Its conductivity li ...
, constructed by creating two
field-effect channels back-to-back, with a junction between. It is a four-terminal device which does not have specific gate terminals because each channel is a gate for the other,
the voltage conditions modulating the current carried by the other channel.
Current–voltage relationship
Where the voltage on the first channel is
and the voltage on the second channel is
, the current in the first channel,
, and the current in the second channel,
, are given by: