R&S ZNB Series User Manual page 601

®
R&S ZNB/ZNBT
2nd Mixer
Selects the measurement for a test setup including two mixers (instead of a single
one); see
elements in the dialog are adjusted accordingly.
Remote command:
[SENSe<Ch>:]FREQuency:CONVersion:MIXer:STAGes
Conversion
Selects 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.
To measure at different mixer output frequencies (e.g. to analyze the isolation for IF =
RF or higher-order mixing products), use the "Define Port Settings" dialog (see
ter 5.12.2.2, "Port Settings
The basic formulas described above are adjusted to the mixer measurement settings:
●
If the RF or one of the LO signals is in Auto mode (instead of IF), the formulas
above are automatically converted. Example: LO 1 in Auto mode, down-conversion
(lower sideband) --> LO 1 = IF + RF.
●
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 two mixer stages are present, the conversion formulas are applied twice; see
Two-stage mixer
Remote command:
[SENSe<Ch>:]FREQuency:CONVersion:MIXer:TFRequency<Stg>
Generators...
Opens the configuration dialog for external generators; see
Generators
lists for the LO signals.
OK
Activates the scalar mixer mode and closes the dialog. A "Mix" label in the channel list
indicates that a mixer measurement is active.
Reset Freq Conv
Remote command:
[SENSe<Ch>:]FREQuency:CONVersion
User Manual 1173.9163.02 ─ 62
Two-stage mixer measurements. The signal diagram and the other control
dialog",
measurements.
dialog", on page 785. Configured generators appear in the port selection
disables the mixer measurement.
on page 562).
GUI reference
Channel Config softtool
Chap-
Chapter 5.18.4.4, "External
601