Atec Rohde-Schwarz-SMA100A - Manual (Page 7)

Scalar network analysis: characterization of a
bandpass filter.
The R&S®SMA-K28 power analysis option makes it pos-
sible to use the R&S®NRP-Zxx power sensors to measure
and display power versus frequency, power and time. The
user does not need any additional equipment to quickly
and simply carry out sophisticated power analysis.
Power analysis applications
Measurement of level versus Application
Frequency ❙ Scalar network analysis
❙ VSWR measurement
(with directional coupler)
Power ❙ Measurement of amplifier charac-
teristics/compression points
Time ❙ Automatic analysis of pulse
parameters
❙ Gated power measurements
The RF signal can be internally modulated by means of the
built-in LF generator or the optional multifunction genera-
tor (R&S®SMA-K24). The multi function generator supplies
various waveforms including sine wave, square wave,
user-programmable trapezoidal waveforms or noise with
selectable bandwidth. Modulation signals can be added
together, with different weighting applied to the individual
signals. The modulation signals for AM/FM/φM and for the
LF output can be set independently of one another. Based
on this concept, the new signal generator offers a level of
modulation flexibility previously unknown in analog signal
generators. For example, all types of two-tone modulation
can be implemented; the user can add together two in-
ternal modulation signals or one external and one internal
signal.
Using noise as a modulation signal, the R&S®SMA100A
generates defined and adjustable phase or FM noise to
simulate, for example, a VCO or an interference signal of
variable spectral purity for receiver tests.
Moreover, the R&S®SMA-B20 and R&S®SMA-B22 FM/φM
modulator options can be used to implement extremely
fast frequency changes (across a limited frequency range).
Direct access to the DDS-based synthesizer yields fre-
quency setting times of nominally 10 µs across a range of
max. 80 MHz. This allows fast frequency- hopping trans-
mitters to be simulated, for example.
Rohde & Schwarz R&S®SMA100A Signal Generator 7