Keysight Technologies N5221A

5-16 Keysight N5221A/22A Service Guide
Theory of Operation
Signal Separation Group Operation
5-
Signal Separation Group Operation
The signal separation group divides the source incident signals into a reference
path and a test path. Refer to Figure 5-4 on page 5-18 and Figure 5-5 on
page 5-19.
— 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 A19 test set motherboard.
In this section, the following assemblies are described:
— A25–A28 Receiver Couplers
— A29–A32 Test Port Couplers
—Front Panel Jumpers—Configurable Test Set
— A34–A37 65-dB Source Step Attenuators and A38–A41 Bias Tees
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 5-4 on page 5-18 and Figure 5-5 on page 5-19, these
jumpers are installed between the components listed below. Ports 3 and 4
apply only to 4-port models.
— the A25 port 1 receiver coupler and the A23 mixer brick receiver R1
— the A26 port 3 receiver coupler and the A24 mixer brick receiver R3
— the A27 port 4 receiver coupler and the A24 mixer brick receiver R4
— the A28 port 2 receiver coupler and the A23 mixer brick receiver R2
— the A25 port 1 receiver coupler and the A29 test port 1 coupler
— the A26 port 3 receiver coupler and the A30 test port 3 coupler
— the A27 port 4 receiver coupler and the A31 test port 4 coupler
— the A28 port 2 receiver coupler and the A32 test port 2 coupler
— the A29 test port 1 coupler and the A23 mixer brick receiver A
— the A30 test port 3 coupler and the A24 mixer brick receiver C