April 2016
Intermediate to advanced
384 pages
12h 56m
English
Content preview from Newnes Circuit Calculations Pocket Book
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322 Circuit calculations pocket book
18.6 Symmetrical T attenuator
Figure 18.13 shows a symmetrical T network. In this type of
network the input and output impedances R
a
are equal, and the two
resistances in the arm AB are also equal.
A
O-
R
2
B
-O
Figure 18.13
The network is designed using the formulas
R
Q
=
V(fl
2
+
2R
X
R
2
)
where R
D
= characteristic impedance
Ro
~ V(/?
OC
^sc)
where R
oc
= open circuit impedance looking into the network
R
x
= short circuit impedance, i.e. the impedance look-
ing into the network with a short circuit across the
output terminals
(N-n
R
2
where N
Ro
network attenuation as a voltage or current ratio
Example 14 If resistance ...
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