delabs Notes – In a Circuit Module, if all Power and Signal
Polarities are reversed. All NPN to PNP, All N-Channel to P-Channel and
Vice Versa. All Diodes and Caps too turned around. This Topsy Turvy or
Mirror Design ought to work in Theory. It has worked for some circuits
in practice too in my experience. ?
Some believe that
N-Channel is more Robust than the P Type. In Bipolar Transistor NPN is
more trusted for the final output stages. The NPN Transistor and
N-Channel turn-on by a Positive control bias. It may be inappropriate to
say this mosfet is NPN or PNP.
traditional metal–oxide–semiconductor (MOS) structure is obtained by
growing a layer of silicon dioxide (SiO2) on top of a silicon substrate
and depositing a layer of metal or polycrystalline silicon (the latter
is commonly used). As the silicon dioxide is a dielectric material, its
structure is equivalent to a planar capacitor, with one of the
electrodes replaced by a semiconductor.
If the MOSFET
is an n-channel or nMOS FET, then the source and drain are “n+” regions
and the body is a “p” region. If the MOSFET is a p-channel or pMOS FET,
then the source and drain are “p+” regions and the body is a “n” region.
The source is so named because it is the source of the charge carriers
(electrons for n-channel, holes for p-channel) that flow through the
channel; similarly, the drain is where the charge carriers leave the
channel. MOSFET – Wikipedia