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inversion layer

N

novice

Jan 1, 1970
0
what is an inversion layer? how it is caused?also what is body effect?
 
R

Richard

Jan 1, 1970
0
novice said:
what is an inversion layer? how it is caused?also what is body effect?
May be wrong group. There doesn't appear to be a sci.weather group, so you
may want http://www.weather.com ? You could also try Google.

Effect on what?

Richard
 
R

Ralph Mowery

Jan 1, 1970
0
novice said:
what is an inversion layer? how it is caused?also what is body effect?

It is a layer of air that is either warmer or colder than the layers above
and below it. It will bend the radio waves. Also in the ocean water it is
a layer of water that is warmer or colder than the water above and below it.
The sonar used to search for submarines will bend and give a false
indication of where the sub is if it even bounces off of it.
 
N

novice

Jan 1, 1970
0
i'm sorry i was talking about FET's not weather....
 
K

Kevin Aylward

Jan 1, 1970
0
novice said:
i'm sorry i was talking about FET's not weather....

Yes. Indeed you were. Quite frankly, I am somewhat amused at the
responses to this question in this group.

Oh...The "body effect" is noted by the change in threshold voltage that
occurs when the backgate/substrate connection of the mos is connected to
a lower potential then its source (nmos case).

If the mos is an isolated structure, one can tie its local tank/well to
its source. This minimises its Vt. If the structure is a non-isolated
one, then this cant be done. In this case the effective Vt will be
higher if the source is not at the substrate potential, e.g. in a nmos
differential pair. Isolated mos use more area, so its a trade off as to
how one designs the circuit. A higher Vt usually can result in less
signal handling range.

The weather over here (London) is a bit drizzly and cold today though.

Kevin Aylward
[email protected]
http://www.anasoft.co.uk
SuperSpice, a very affordable Mixed-Mode
Windows Simulator with Schematic Capture,
Waveform Display, FFT's and Filter Design.
 
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