Keysight EXG and MXG X-Series Signal Generators User’s Guide 213Basic Digital Operation for N5172B/82B with Options 653/655/656/657Using I/Q ModulationConfiguring the Front Panel I and Q Input ConnectorsThe signal generator accepts externally supplied analog I and Q signals through the front panel IInput and Q Input. You can use the external signals as the modulating source, or sum the externalsignals with the internal baseband generator signals.1. Connect I and Q signals to the front panel connectors.a. Connect an analog I signal to the signal generator’s front panel I Input.b. Connect an analog Q signal to the signal generator’s front panel Q Input.2. Set the signal generator to recognize the front panel input signals:— To Modulate onto the CarrierPress I/Q > I/Q Source > External.— To Sum and Modulate onto the CarrierPress I/Q > I/Q Source > Sum.To select and play a waveform for the BB GEN path, see page 156.Notice that only the internal BBG (BB GEN) routes I and Q signals to the rear panel I and Qoutputs.3. If you are using only the external I and Q signals (no summing), turn on the I/Q modulator:Press I/Q Off On to On.4. Configure the RF output:a. Set the carrier frequency.b. Set the carrier amplitude.c. Turn the RF output on.Signal generator display: both paths are calibratedwhen the I/Q Correction Optimized Path is set toExt I/Q Output (see page 212)Note: when the optimized path is set to RF, only theRF Out path is calibrated.Signal generator display: both RF paths are calibratedwhen the I/Q Correction Optimized Path is set toRF Output (see page 212)
