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Downconverter Operation
AM Noise Measurement (IF AM Detector) User Control
AM Noise Measurement (IF AM Detector)
User Control
Overview
This procedure describes how to use the HP 70427A Downconverter
Module with the HP 3048A Phase Noise Measurement System. The
downconverter accepts a signal from 5 MHz to 26.5 GHz and produces a
baseband signal as well as an IF output.
The downconverter's AM specifications only apply to the RF AM detector.
The reason for choosing the IF AM detector for a noise measurement is that
a lower carrier power can be measured. The RF AM detector is limited to
carrier levels greater than 0 dBm.
With the IF Am detector, carrier levels down to – 30 dBm can be measured
because the signal is amplified by the IF amplifier before going to the IF Am
detector.
The IF AM detector can also be used with the downconverter in mm mode
(external harmonic mixer). To do this, set up the downconverter for
downconverting a mm wave signal as if for a phase noise measurement, then
follow the procedure starting at step 3.
The procedure can be used for all HP 3048A and HP 3047A Phase Noise
Measurement software. The HP 70427A is controlled manually.
With HP 3048A software versions A.03.00, or later, the HP 70427A can be
controlled by the software.
Figure 3-4
AM Noise Measurement (IF AM Detector) Connection Diagram
HP 70427A/HP 70428A User's Guide 3-17
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