Specifications

82 Chapter 10
Using External Millimeter Mixers (Option AYZ)
Making Measurements With Agilent 11970 Series Harmonic Mixers
Using External Millimeter Mixers
(Option AYZ)
Making Measurements With Agilent 11970
Series Harmonic Mixers
External harmonic mixers can be used to extend the frequency range of
the E4407B, E4440A, E4446A and E4448A spectrum analyzers. Agilent
Technologies manufactures external mixers that do not require biasing
and cover frequency ranges from 18 GHz to 110 GHz. For frequency
ranges from 110 GHz up to 325 GHz, other mixers are available from
other manufacturers (these mixers may require biasing). The Agilent
Technologies E4407B, E4440A, E4446A, and E4448A spectrum
analyzers support harmonic mixers and preselected harmonic mixers.
When using harmonic mixers, multiple mixing products are shown on
the analyzer display. The output of a harmonic mixer contains the sum
and difference frequencies of the input signal with the LO and all of its
harmonics. To display the correct signal, signal identification can be
used to remove all undesired mixing products. Once the correct signal is
identified, signal identification must be turned off to measure the
amplitude accurately.
Step 1. Connect the signal source and harmonic mixer to the analyzer as shown
in Figure 10-1.
Figure 10-1 Instrument Connections with a 11970 Series Harmonic Mixer
CAUTION The analyzer local oscillator output power is approximately +16 dBm.
Be sure that your external harmonic mixer can accommodate the power
level before connecting it to the analyzer.
NOTE Agilent 5061-5458 SMA type cables should be used to connect the mixer
IF and LO ports to the analyzer. Do not over-tighten the cables. The
maximum torque should not exceed 112 N-cm (10 in-lb.)