The symbols are quite logical, as long as you understand what they are telling you. Look carefully at where the arrow is pointing to/from and you will see the difference. In one case it's pointing from the channel to the source, in the other, it's pointing from the bulk to the channel. Each symbol is using a different aspect of the physical FET device to indicate the polarity.Right it's an NMOS. I thought when the arrow points "out" it's PMOS and when it points "in" it's NMOS but apparently it's only like that in some symbols, and here it's the other way around. Very logical... NOT.
That's correct for b) but not for a). So it's not really logical.But in MOS usually the arrow in bulk show electron current flow.
That's what I mean. The arrows points to two different things in each case (a and b). It's not logical. Logical would have been if the arrows would be refering to the same thing in both symbolsFor case A we have "electrons" arrow (from "minus" to "plus").
For case B we have a positive charge flow arrow (conventional current flow).
The arrow has to serve two purposes. First, it has to identify the polarity of the device, but second it identifies the source terminal, as opposed to the drain.So what does the arrows represent actually, in either case?
For a) The arrows could be viewed as the direction electrons are attracted (or repelled), i.e. for NMOS electrons go to the left, thereby creating an N-channel
For b) The arrows could be viewed as ?