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System Description
Millimeter-Wave Test Head Modules
Theory of Operation
Refer to the block diagram in
The N5261A or N5262A millimeter head controller routes the LO and RF signals from the
N5227A 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 N5261A or N5262A millimeter head controller, by way of a multi-pin interface cable.
10 MHz to 67 GHz Operation
The RF signal from the N5227A PNA SOURCE OUT is input into the SOURCE OUT connector of
the combiner module. The RF signal is then input to the bias tee and then the coupler. From the
coupler, the RF signal passes through the combiner and then 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 connector via the combiner
and coupled arm of the coupler. This output goes to the RCVR IN connector on the appropriate
port of the N5227A PNA.
67 GHz to 110 GHz Operation
The RF signal is received from the N5261A or N5262A 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 (optional), 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 N5227A PNA through the N5261A or N5262A millimeter head
controller. The harmonic mixers combine the 8th harmonic of the LO with the test or the
reference signals to produce the Test IF and Ref IF signals. The IF signals are passed to the
N5227A PNA for further processing.
2-8
Figure 2-6 on page 2-9
PNA Series Microwave Network Analyzer System
for the following paragraphs.
Installation and Service Guide N5251-90001
N5251A
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