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Principles of Analog Electronics
book

Principles of Analog Electronics

by Giovanni Saggio
January 2014
Intermediate to advanced content levelIntermediate to advanced
567 pages
23h 13m
English
CRC Press
Content preview from Principles of Analog Electronics
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 veried,
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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Publisher Resources

ISBN: 9781466582026