5-20 Service Guide N5227-90001
Theory of Operation PNA Series Microwave Network Analyzers
Signal Separation Group Operation N5227A
Signal Separation Group Operation
The signal separation group divides the source incident signals into a reference path and a test path. Refer
to Figure 5-5 on page 5-22 and Figure 5-6 on page 5-23.
• The reference signals are transmitted to the receiver group as the R1, R2, R3, and R4 inputs for 4-port
models or the R1 and R2 inputs for 2-port models.
• The test signals are transmitted through—and reflected from—the device under test (DUT) and then
transmitted to the receiver group as the A, B, C, and D inputs for 4-port models or the A and B inputs for
2-port models.
• Control lines to this group are routed from the A23 test set motherboard.
In this section, the following assemblies are described:
• A29–A32 Receiver Couplers
• A33–A36 Test Port Couplers
• Front Panel Jumpers—Configurable Test Set
• A38–A41 60-dB Source Step Attenuators and A42–A45 Bias Tees (Optional)
Configurable Test Set
The configurable test set is included in the standard analyzer and allows you to measure devices with higher
power and higher dynamic range limits than an analyzer without the configurable test set. On 4-port models,
twelve signal paths, routed through front panel SMA jumpers, comprise the configurable test set. On 2-port
models, there are six signal paths routed through front panels jumpers in the configurable test set.
As shown in Figure 5-5 on page 5-22 and Figure 5-6 on page 5-23, these jumpers are installed between the
components listed below. Ports 3 and 4 apply only to 4-port models.
• the A29 port 1 receiver coupler and the A27 mixer brick receiver R1
• the A30 port 3 receiver coupler and the A28 mixer brick receiver R3
• the A31 port 4 receiver coupler and the A28 mixer brick receiver R4
• the A32 port 2 receiver coupler and the A27 mixer brick receiver R2
• the A29 port 1 receiver coupler and the A33 test port 1 coupler
• the A30 port 3 receiver coupler and the A34 test port 3 coupler
• the A31 port 4 receiver coupler and the A35 test port 4 coupler
• the A32 port 2 receiver coupler and the A36 test port 2 coupler
• the A33 test port 1 coupler and the A27 mixer brick receiver A
• the A34 test port 3 coupler and the A28 mixer brick receiver C
• the A35 test port 4 coupler and the A28 mixer brick receiver D
• the A36 test port 2 coupler and the A27 mixer brick receiver B
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