Concepts and Features
R&S
®
ZNB/ZNBT
206
User Manual 1173.9163.02 ─ 38
●
The Local Oscillator (LO) signal is an additional RF signal that is either generated
by the network analyzer (at one of the ports that are not used for the RF and IF
signals) or by an external generator. A test setup with two mixers involves two
independent LO signals at both mixers.
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The IF signal is the mixer output signal (mixing product), which is at one of the fol-
lowing conversion frequencies: IF = LO + RF or IF = |LO – RF|, i.e. LO – RF (for
LO > RF) or IF = RF – LO (for RF > LO). The IF frequency is selected in the "Fre-
quencies" dialog. A test setup with two mixers involves two independent conver-
sion settings.
The signal description above with the swept RF signal and the LO signal at a fixed fre-
quency corresponds to the default configuration. In the "Frequencies" dialog, you can
select any of the signals as a "Sweep/CW" signal. You can set the frequency range for
this signal via "Start/Stop" or "CW Frequency". A second signal is at a "Fixed" fre-
quency, and the third at the calculated sum or difference frequency ("Auto").
The labeling of the complete diagrams depends on the sweep type.
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The following mixer signal diagram corresponds to a
frequency sweep
:
–
RF signal (left side): Analyzer port number (e.g. Port 1), frequency sweep
range (or fixed frequency, if the LO signal is swept), CW power, frequency con-
version settings (1 / 1 denotes no conversion).
–
LO signals (1 or 2, from below): Signal source (analyzer port or external gener-
ator), fixed power and frequency (or frequency sweep range, if the RF signal is
at fixed frequency), frequency conversion settings.
–
IF signal (right side): Analyzer port number (e.g. Port 2), frequency range =
(sweep range + LO) or |sweep range – LO|, expected fixed power.
●
The following mixer signal diagram corresponds to a
power sweep
:
–
RF signal (left side): Analyzer port number (e.g. Port 1), power sweep range or
fixed power, CW frequency, frequency conversion settings (1 / 1 denotes no
conversion).
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