Concepts and features
R&S
®
ZNA
314User Manual 1178.6462.02 ─ 29
Ref. receiver
Meas. receiver
Port 2
Source
R&S®ZNAxx-B32:
R&S®ZNAxx-B22:
Source step att
(0-70 dB / 10 dB)
Receiver step att
(0-35 dB / 5 dB)
R&S®ZNAxx-B302/312:
Low Noise Amplifier
(20-30 dB / 5 dB)
10 dB
Figure 4-41: LNA circuitry: reversed coupler configuration (simplified)
Reversing the coupler and activating the LNA at port 2 lowers the 0.1 dB compression
point to approximately ‑40 dBm. Choosing a lower gain of the LNA improves the com-
pression point.
4.7.37 Internal low power spur reduction amplifier
Hardware options R&S ZNAxx-B501, R&S ZNA50-B511, R&S ZNA67-B511
The purpose of these options is to lower the local oscillator (LO) leakage at port 1,
which is required for properly measuring high gain DUTs (> 60 dB) or DUTs with low
input compression. To suppress the LO leakage, it adds a 30 dB switchable low noise
amplifier (LNA) to the receiving path of port 1.
The LNA is located after the receiver step attenuator, which can be freely set and
therefore allows you to optimize the input compression and noise behavior at this mea-
surement receiver. See Figure 4-42.
●
R&S ZNA50/67-B501 is subject to export control restrictions.
R&S ZNA50/67-B511 is not subject to export control restrictions, but if this HW
option is installed, the spectrum analysis software option R&S ZNA-K1 is blocked.
●
The R&S ZNAxx must be equipped with a receiver step attenuator at port 1 (option
R&S ZNAxx-B31)
Optional extensions and accessories
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