In general, the MOSFET is a four terminal device and the source and drain are interchangeable. In integrated circuit designs, most of the FETs will be symmetric and there is truly no distinction between the source and the drain. But there IS a difference between N-channel and P-channel FETs, so the symbol needs to indicate which type of FET it is. There are several common ways of doing that.Hi to all!
There is a "bi-directional" mosfet?
In some circuit, I noticed that the Mosfet are drawn without any arrow; why? Are this different mosfet?
While that is likely the case with DRAM, it is most certainly NOT the case with CMOS in general.I myself once engaged in the development of dynamic memory. The fourth pin of all transistors of the same type is connected to the same node of the circuit. Drawing an arrow is not rational, as there will be a blockage of the scheme. When they draw the topology of the transistor, they draw only the drain, the source and the gate. Pin substrate is obtained automatically.
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