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Transmission gate
A transmission gate is similar to a relay that can conduct in both directions or block by a control signal with almost any voltage potential.
== Structure ==
In principle, a transmission gate made up of two field effect transistors, in which - in contrast to traditional discrete field effect transistors - the substrate terminal (Bulk) is not connected internally to the source terminal. The two transistors, an n-channel MOSFET and a p-channel MOSFET are connected in parallel with this, however, only the drain and source terminals of the two transistors are connected together. Their gate terminals are connected to each other via a NOT gate (inverter), to form the control terminal.
As with discrete transistors, the substrate terminal is connected to the source connection, so there is a transistor to the parallel diode (body diode), whereby the transistor passes backwards. However, since a transmission gate must block flow in either direction, the substrate terminals are connected to the respective supply voltage potential in order to ensure that the substrate diode is always operated in the reverse direction. The substrate terminal of the p-channel MOSFET is thus connected to the positive supply voltage potential and the substrate terminal of the n-channel MOSFET connected to the negative supply voltage potential.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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