226 N5511A Phase Noise Test System User’s Guide
FM Discriminator Measurement Examples
FM Discriminator Single Channel Measurement using Double-Sided Spur Calibration
Determining the discriminator (delay line) length
Perform the following steps to determine the minimum delay line length (
τ
)
possible to provide an adequate noise to measure the source.
1.
Determine the delay necessary to provide a discriminator noise floor that
is below the expected noise level of the DUT.
shows the noise
floor of the discriminator for given delay times (t).
2.
Determine the length of coax required to provide the necessary delay (
τ
).
(Eight feet of BNC cable will provide 12 ns of delay for this example.)
3.
Determine the loss in the delay line. Verify that the signal source will be
able to provide a power level at the output of the delay line of b5
and +17 ICBM. Be sure to take into account an additional 4 to 6 dB of loss
in the power splitter. (The loss across 8 feet of BNC cable specified in this
example is negligible.) The test set Signal and Reference inputs requires
+15 ICBM.
Figure 10-2
Discriminator noise floor as a function of delay time
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