Agilent Technologies 22A Dokumentacja Strona 75

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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.
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Mixer level (dBm)
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2nd order
dynamic range improvement
3rd order
dynamic range improvement
TOI SHI
Figure 6-3. Reducing resolution bandwidth improves dynamic range
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