Rohde & Schwarz 1332.4500.22, Руководство пользователя

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GUI Reference
R&S
®
ZNA
294 User Manual 1178.6462.02 ─ 12
The frequency-converting device is considered to be part of the mixer system under
test (MUT). In the default configuration where the RF signal is swept and the LO sig-
nals are at fixed frequency, the conversion factors do not modify the analyzer's source
signals (RF, LO 1, LO 2). They are used for the calculation of the IF frequency only.
Remote command:
[SENSe<Ch>:]FREQuency:CONVersion:MIXer:RFMultiplier
[SENSe<Ch>:]FREQuency:CONVersion:MIXer:LOMultiplier<Stg>
RF, IF and Mixer Stages
The table in the "Frequency" tab contains the following columns:
●
The frequency selectors specify how the frequency for each signal is defined. One
of the mixer input and output signals is at the analyzer's channel base frequency
("Base Freq"; the signal is swept if a frequency sweep is active; it is at fixed fre-
quency (CW) for the other sweep types). One or two signals are at "Fixed" frequen-
cies. The last frequency or frequency range is calculated automatically ("Auto"),
depending on the other dialog settings.
●
The power selectors specify how the power for each signal is defined. Each of the
mixer input signals RF, LO 1, and LO 2 (if present, for ) can be either at the analyz-
er's channel base power ("Base Pwr"; the signal is swept if a power sweep is
active; it is at fixed power (CW) for the other sweep types) or at the "Fixed" power.
The same applies to the IF signal.
●
The conversion selectors of the two mixer stages determine the frequency of the IF
signal.
The output signal (IF signal) of each mixer can be at the sum or at the difference of
the RF and LO input frequencies.
–
IF = RF – LO means that the RF signal is down-converted (upper sideband).
The analyzer automatically switches to IF = LO – RF if the LO frequency is
above the RF input frequency.
– IF = LO – RF means that the LO signal is down-converted (lower sideband).
The analyzer automatically switches to IF = RF – LO if the RF input frequency
is above the LO frequency.
– IF = LO + RF means that the RF input signal is up-converted.
Use the "Port Settings" dialog to perform measurements at different mixer output
frequencies (e.g. to analyze the isolation for IF = RF or higher-order mixing prod-
ucts), see
Chapter 6.12.2.2, "Port Settings Dialog" , on page 516.
●
"Mixer 2" allows you to define a test setup including two mixers (instead of a single
one); see
Two-Stage Mixer Measurements . The signal diagram and the other con-
trol elements in the dialog are adjusted accordingly.
Remote command:
[SENSe<Ch>:]FREQuency:CONVersion:MIXer:FUNDamental
[SENSe<Ch>:]FREQuency:CONVersion:MIXer:MFFixed
SOURce<Ch>:FREQuency:CONVersion:MIXer:PMODe
Meas Softtool