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Amplitude Noise Measurement
AM Noise
Measurement
Block Diagrams
Document Part No. E5500-90024Ed. 1.0
The level of amplitude modulation sidebands is also constant with
increasing modulation frequency. The AM detector gain can thus be
measured at a single offset frequency and the same constant will
apply at all offset frequencies. Replacing the phase detector with an
AM detector, the AM noise measurement can be calibrated in the
same way as PM noise measurement, except the phase modulation
must be replaced with amplitude modulation.
The AM noise measurement is a characterization of a source. The
residual AM noise of a DUT can only be made by using a source with
lower AM noise, then subtracting that AM noise from the measured
output noise of the DUT. The noise floor of this technique is the noise
floor of the source.
Figure 12-1 AM Noise System Block Diagram using an E5500 Opt 001
Figure 12-2 AM Noise System Block Diagram using an External Detector
E5500 Phase Noise Measurement System Version A.02.00
AM Noise Measurement Fundamentals
Amplitude Noise Measurement
12
12-3
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