January 2014
Intermediate to advanced
567 pages
23h 13m
English
Content preview from Principles of Analog Electronics
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Principles of Analog Electronics
468
12.3.2.3 C.D.: Voltage Gain
The MOSFET’s KVL expression gives
vvv
gd gs sd
=+
and the analysis of the AC equivalent model of Figure 12.14 gives
|| || || ||vgvr RR gv vr
RR
sd mgso SL mgddso
SL
)
(
))
((
==−
1|||
||
|||
()()
+
=vgrRRvgr
RR
sd mo SL gd mo
SL
Therefore,
A
v
v
gr
RR
gr
RR
|| ||
1||||
def
vMOS
sd
gd
mo
SL
mo
SL
)
)
(
(
=
+
Since the occurrence of
|| || 1gr RR
mo SL
)
(
is often veried,
1A
vMOS
≅
, hence
the name source follower.
Now, the overall voltage gain must take into account the attenuation factor
,vi
α
due to the input voltage divider:
,
R
RR
vi
G
GS
α=
+
so, nally
|| ||
1||||
A
gr RR
gr RR
R
RR
v
mo SL
mo SL
G
GS
)
)
(
(
=
++
12.4 C.G. CONFIGURATION
In a common ...
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