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Microwave Engineering
book

Microwave Engineering

by Ahmad Shahid Khan
May 2014
Intermediate to advanced content levelIntermediate to advanced
800 pages
24h 50m
English
CRC Press
Content preview from Microwave Engineering
609Microwave Transistors
f g C L
c m s
= =/ 2 /4
gs
( )π υ π
(14.43)
where g
m
is the transconductance, L is the gate length,
υ
s
is the saturation
drift velocity and C
gs
is the gate–source capacitance. The C
gs
is given by
C
dQ
dV
V
gs
gs
constant
gd
=
=
(14.44)
From the charge carrier transit time (
τ
) discussed in connection with the
power frequency limitation of BJTs, the cutoff frequency is obtained to be
f L
c s
= =1/2 /2πτ υ π
(14.45)
This value is just half of the value obtained in Equation 14.43.
Maximum oscillation frequency (f
max
): The maximum frequency of oscilla-
tion, in a distributed circuit, depends on the transconductance and the drain
resista ...
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Publisher Resources

ISBN: 9781466591417