OPERATION
AC VOLTAGE/CURRENT MEASUREMENT
and then drop again to
-3.00
dB. Note the
frequency
of
the signal generator. This will be
the lower frequency limit
of
the bandwidth.
2-104. A similar technique can be used
to determine the
frequency response
of
other ac circuits, such as high-pass
or
low-pass filters, notch filters, etc.
SIGNAL
GENERATOR
AMPLIFIER
dB
Rel.
Ref.
Level
-
0
dB
-3 dB
2-105.
FINDING
THE
Q
OF
A
SINGLE
TUNED
CIRCUIT
2-106.
Use
the following equation and the application
technique for measuring the bandwidth
of
a circuit,
to
find the Q
of
a single tuned circuit:
_ Resonant Frequency
Q -
2 x Bandwidth
LOAD
8050A
I
I
I I
I
-------
-
--1-
--
--
f
1
1
I
fc
Bandwidth
(BW)
F
Figure 2-17. Measuring
Amplifier
Bandwidth
2-20
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