Rohde & Schwarz ESRP Series, Руководство пользователя

Страница: 447 / 1094

I/Q Analyzer
R&S
®
ESRP
444 User Manual 1175.7445.02 ─ 08
Repetition Interval
Opens an edit dialog box to define a repetition interval in which the measurement is
triggered. The shortest interval is 2 ms. This softkey is only available if the trigger
source "Time" is selected (see
"Time" on page 348).
Remote command:
TRIGger<n>[:SEQuence]:TIME:RINTerval
on page 808
Trigger Hysteresis
Defines the value for the trigger hysteresis for "IF power" or "RF Power" trigger sour-
ces. The hysteresis in dB is the value the input signal must stay below the power trig-
ger level in order to allow a trigger to start the measurement. The range of the value is
between 3 dB and 50 dB with a step width of 1 dB.
Remote command:
TRIGger<n>[:SEQuence]:IFPower:HYSTeresis
on page 805
Trigger Holdoff
Defines the value for the trigger holdoff. The holdoff value in s is the time which must
pass before triggering, in case another trigger event happens.
This softkey is only available if "IFPower", "RF Power" or "BBPower" is the selected
trigger source.
Remote command:
TRIGger<n>[:SEQuence]:IFPower:HOLDoff
on page 805
7.5 Working with I/Q Data
This section describes I/Q data processing of RF input, e.g. in the I/Q Analyzer.
The block diagram in Figure 7-1 shows the analyzer hardware for active RF input from
the IF section to the processor.
The A/D converter samples the IF signal at a rate of 128 MHz. The digital signal is
down-converted to the complex baseband, lowpass-filtered, and the sample rate is
reduced. The continuously adjustable sample rates are realized using an optimal deci-
mation filter and subsequent resampling on the set sample rate.
The I/Q data is written to a single memory, the data acquisition is hardware-triggered.
Working with I/Q Data