Product specifications

35
Swept-power measurement
examples
The setup and calibration processes described in the previous sections can be
used for swept-power with either wideband or narrowband pulse measurements.
Figure 26 compares the results between open loop and receiver leveling modes
in swept-power measurements with the same sample 5 GHz amplifier using
wideband detection technique. The following setup is used in this example.
CW Frequency: 5 GHz
Power sweep range: -25 to +5 dBm
Number of points: 201
IF bandwidth: 5 MHz
PRI: 100 us
Pulse width: 5 us
Pulse delay: 0 s
Measurement delay: 400 ns
Pulse trigger: Internal
Traces: Tr1 S11, Tr2 S21, Tr3 R1,1, Tr4 B,1
The input and output power measurements show the differences between the
open loop and receiver leveling modes, which are similar to the swept-frequency
measurements. However, the gain traces are close with both modes while the
amplifier is in linear operation and exhibit differences as the amplifier com-
presses. This is because the input powers are slightly different between two
leveling modes with the same stimulus power settings, resulting in a different
gain compression point.
Figure 26. Wideband pulse swept-power measurement comparisons between
open loop and receiver leveling modes (calibrated)