Concepts and Features
R&S
®
ZNB/ZNBT
207
User Manual 1173.9163.02 ─ 38
–
LO signals (1 or 2, from below): Signal source (analyzer port or external gener-
ator), fixed power or power sweep range, CW frequency, frequency conversion
settings.
–
IF signal (right side): Analyzer port number (e.g. Port 2), fixed frequency = (RF
+ LO) or |RF – LO|, expected power range.
●
The following mixer signal diagram corresponds to a
Time or CW mode sweep
:
–
RF signal (left side): Analyzer port number (e.g. Port 1), fixed power, CW fre-
quency, frequency conversion settings (1 / 1 denotes no conversion).
–
LO signals (1 or 2, from below): Signal source (analyzer port or external gener-
ator), fixed power, CW frequency, frequency conversion settings.
–
IF signal (right side): Analyzer port number (e.g. Port 2), fixed frequency = (RF
+ LO) or |RF – LO|, expected fixed power.
The ports in the mixer signal diagrams are physical ports. To measure mixers with dif-
ferential inputs, define a logical port configuration and enter one of the physical ports
that belong to the logical port. The analyzer will implicitly account for the logical port
settings.
4.7.3.3
Intermodulation Measurements
R&S
ZNB/ZNBT-K14
The intermodulation measurement requires options R&S
ZNB/ZNBT-K14 and, as a
prerequisite, the
Mixer and Frequency Conversion Measurements
option R&S
ZNB/
ZNBT-K4. The "Intermodulation Wizard" facilitates the measurement configuration and
selection of results (see
Chapter 5.5.4, "Intermod. Tab"
An intermodulation measurement is performed with two RF signals of equal power but
different frequencies termed the upper and lower tone. The purpose of the measure-
ment is to test the properties of a DUT that is supplied with a signal that covers a fre-
quency band, typically a modulated RF channel. To simulate this scenario, the fre-
quency difference ("tone distance") between the upper and lower signal is chosen to
be small compared to the frequencies of the two tones:
f
L
≈
f
U
or
Δ
f = f
U
- f
L
≪
f
L
A nonlinear behavior of the DUT causes emissions at frequencies which correspond to
sums and differences of the upper and lower tone frequencies and their integer multi-
ples. These intermodulation products can be in the vicinity of the upper and lower tone
frequencies, provided that their order is odd.
Optional Extensions and Accessories
