Specifications

75
Figure 6-2 shows the dynamic range for one resolution bandwidth. We
certainly can improve dynamic range by narrowing the resolution bandwidth,
but there is not a one-to-one correspondence between the lowered noise
floor and the improvement in dynamic range. For second-order distortion,
the improvement is one half the change in the noise floor; for third-order
distortion, two-thirds the change in the noise floor. See Figure 6-3.
–60 –50 –40 –30 –20 –10 +100
–90
–80
–70
–60
–50
–40
–30
–20
–10
0
2
n
d
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d
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r
N
o
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(
1
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k
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)
N
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(
1
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B
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)
3
rd
o
rd
e
r
Mixer level (dBm)
(dBc)
2nd order
dynamic range improvement
3rd order
dynamic range improvement
TOI SHI
Figure 6-3. Reducing resolution bandwidth improves dynamic range