
Principles of Analog Electronics
308
➜ Ohmic or triode, or linear region
conditionv Vv
current iKvV
: 0
: 2
GS th DS
DS nGSthD
S
2
()
−> >
=−−
➜ Saturation region
:0
: 1
2
conditionvVv
current iKvV v
GS th DS
DS nGSt
S
()
<−<
=−+λ
.
The blue line in Figure 8.58 for which
separates ohmic and satura-
tion regions.
Observation
The λ parameter is very often ignored due to its low value, which depends on
the channel length and is typically
10 1/v
.
The following is a MATLAB
®
routine to graph an example of the I–V characteristic
of a MOSFET (Figure 8.59), neglecting the overall contribution of λ, and assuming
=[
−