IQ Skew Calibration (Adjustment)

(N5166B / N5171B / N5172B / N5181B / N5182B / N5182N)

The following calibrations must be performed prior to running this adjustment:

  • all synthesizer calibrations

  • all power calibrations

The main goal of this calibration is to generate the asymmetric IQ magnitude and phase correction data requried flatten frequency response of the system from the output of the IQ DACs, through the analog IQ baseband system to the IQ Modulator inputs. A secondary goal is to match the I and Q magnitude and phase response versus baseband frequency to improve image performance.

Required Test Equipment

Test Equipment

Recommended Model

Alternate Model(s)

Spectrum Analyzer

PXA N9030B Option Pxx1

 

PXA N9030A Option Pxx1

PSA models Option [1DS or 110]1:
E4440A
E4443A
E4445A
E4446A
E4447A
E4448A

  1. Preamp option (Pxx for PXA, 1DS or 110 for PSA) is recommended but not required.

 

Connections and Setup Procedures
  • All test equipment requires a 30 minute warmup period to ensure accurate performance.
  • In the following setup, cables are designated as solid lines and direct connections are designated as dashed lines.

Initialize Test Equipment

  1. Connect all test equipment as shown.
  2. Preset all test equipment and the signal generator.

 

Setup for IQ Skew Calibration

In Case of Difficulty

If this adjustment fails, perform the following steps in order:

  1. Check the equipment setup (see above). If the setup is incorrect, make the necessary corrections and rerun the adjustment.

  2. Refer to the troubleshooting section of the service guide. If you do not have a printed copy of the service guide (Option OBW), one is available either on the CD-ROM that came with your signal generator shipment or on the Keysight website.

  3. If necessary, obtain service from Keysight Technologies. Refer to Contacting Keysight Technologies.