2-8 Installation and Service Guide N5250-90001
PNA Series Microwave Network Analyzer System
N5250A
System Description
Millimeter-Wave Test Head Modules
Theory of Operation
Refer to the block diagram in Figure 2-5 on page 2-9 for the following paragraphs.
The N5260A millimeter head controlle
r routes the LO and RF signals from the E8361C PNA to
the test set modules. The millimeter head controller also performs switching from port 1 to port
2. The test head modules separate the incident from the reflected RF signal and then down
convert those signals to an IF signal.
The test head modules do not have their own power supplies; each head receives DC power from
the N5260A millimeter head controller, by way of a multi-pin interface cable.
10 MHz to 67 GHz Operation
The RF signal is received from the E8361C PNA SOURCE OUT and input into the RF IN
connector of the combiner module. The RF signal is then input to either the bias tee or coupler
depending on the option configuration. From the coupler, the RF signal passes through the
combiner and then on to the test port.
The signal received at the test port of the combiner (either transmitted from another test head
module or reflected from a device under test) is routed to the RCVR OUT connector via the
combiner and coupled arm of the coupler. This output goes to the E8361C PNA RCVR A IN or
RCVR B IN.
67 GHz to 110 GHz Operation
The RF signal is received from the N5260A millimeter head controller and input into the RF IN
connector of the T/R millimeter module. The RF is then amplified and multiplied times six by the
source multiplier. This multiplied incident RF signal then passes through micrometer,
attenuator (option), and a dual directional coupler where a portion of it is coupled off into the
reference mixer.
The signal received at the test port of the combiner section (either transmitted from another test
head module or reflected from a device under test) is routed back to the dual directional
coupler in the T/R millimeter module where a portion of it is coupled off into the test mixer.
The LO signal is input from the E8361C PNA LO through the N5260A millimeter head controller.
The LO 8th harmonic is input into the reference and test converters. These converters mix the LO
with the RF signals so that two IF signals are output. These IF signals (incident and reflected) are
then output to the millimeter head controller, as the REF IF and TEST IF signals respectively,
and passed to the E8361C PNA for further processing.
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