Applications
Measuring Amplifier Stage Gain with Relative dB
3
3-5
High Q
Medium Q
Low Q
fc = Center Frequency
Q =
fc
Bandwidth
dx23f.eps
Figure 3-2. Measuring Q with the 8060A
3-4. Measuring Amplifier Stage Gain with
Relative dB
When testing multi-stage amplifiers, we are usually interested in the dB gain
or loss at each stage referenced to an initial dB level. Figure 3-3 shows an
example of this kind of application with the 8060A. A 20 mV signal is
applied to the first stage of a three-stage amplifier. This signal is measured
with the 8060A in the ac voltage function. Then the dB button is pressed
followed by the REL button which creates the relative reference 0 dB point.
Each stage is then measured, and the 8060A displays the dB level with
reference to the initial input.
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