Operating Manual R&S SMIQ - Volume 1 - Rohde & Schwarz

SMIQTest Procedures5.3.14.2 Analog Outputs with Digital ModulationTest equipment AC voltmeter (Table 5-1, item 2), feed-through termination (Table 5-1,item 28).Test setupConnect AC voltmeter with feed-through termination to the I or Qsocket of the SMIQ.Measurement Settings on SMIQ as above,FREQ 1 GHz• A sinewave signal with a frequency equal to symbol rate/4 with0.5 V (peak) +-5% amplitude into 50 Ω should be measured at theI and Q output.5.3.14.3 Modulation Depth with ASKTest equipment Demodulator for digital modulation (Table 5-1, item 23)Measurement Settings on SMIQ:- Level 0 dBm, RF 1 GHz– Switch on digital modulation ASK– ASK DEPTH 50 %- SYMBOL RATE 30 kHz- FILTER SPLIT PHASE/2.00- Data source PRBS, length 23 bits On the demodulator selectCENTER FREQUENCY 1 GHzREFERENCE LEVEL 5 dBm and inMODE VECTOR ANALYZER/ANALOG DEMODMEAS RESULT/AM SIGNALDEMOD BANDWIDTH 500kHzSWEEP TIME 200usMODULATION SUMMARY Read the AM modulation depth +-Pk/2 on the demodulator. It should be 50 +/-7%.5.3.14.4 Deviation Error with FSKTest equipment Demodulator for digital modulation (Table 5-1, item 23)Measurement Settings on SMIQ:- Level 0 dBm, RF 1 GHz- Switch on digital modulation 2FSK- Symbol rate 1 kHz, deviation 200 Hz- Filter GAUSS 0.2- Data source PRBS, length 23 bits Make the corresponding settings on the demodulator inMODE VECTOR ANALYZER/DIGITAL DEMOD,evaluation over 150 symbols, 10 averaging procedures Measure the FSK deviation error (rms) on the demodulator. Repeat the measurement with 4FSK, filter parameter 0.7.1125.5555.03 5.39E-9