Getting Started Guide 17
Introduction
Overview
As illustrated below, the CIU is able to upconvert the RF output of the UXM to
the 6-12 GHz range (the lower portion of the picture), and apply this signal to
the DUT. On the same path, it also can accept a return signal from the DUT,
downconvert it to the range of the UXM, and return it to an input port on the
UXM.
For mmWave testing (the upper portion of the picture), the RF output of the
UXM can pass through the CIU (bypassing the upconverter) to the M1740A
remote radio head, where it is upconverted to a mmWave signal which is
transmitted wirelessly to the DUT. The returned mmWave signal is received by
the M1740A, downconverted, and passed back through the CIU to the UXM RF
input. The CIU also supplies the combined LO, DC Power, and Control inputs
which the M1740A requires. The LO/Ctrl/Pwr output of the CIU is the only
essential connection between the CIU and M1740A, because the RF input and
output from the UXM can be cabled directly between the UXM and the
M1740A, rather than passing through the CIU as in this illustration.
Figure 1-8 Functional block diagrams of M1740A and E7770A
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