Table of Contents
Advertisement
Downconverter Operation
AM Noise Measurement (IF AM Detector) System Control
AM Noise Measurement (IF AM Detector)
System 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-power carrier 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 this procedure.
This procedure can be used for HP 3048A Phase Noise measurement
software versions A.03.00 and later. The software can be configured for
system control of the downconverter.
Figure 3-8
AM Noise measurement (IF AM Detector) System Control Connection
3-34 HP 70427A/HP 70428A User's Guide
Advertisement
Table of Contents
