I/Q Timeskew RF

(Option 001, 002, 601, or 602 Only)

This adjustment requires firmware revision C.03.10 or later.

The purpose of this calibration is to determine the I/Q timing skew adjustments required to minimize the I/Q timing skew of internally generated signals on the RF output. This adjustment will be required for a number of the unique I/Q baseband paths that exist from the baseband generator, through the instrument to the I/Q Modulator and ultimately to the RF output. The calibration is accomplished by applying identical multitone baseband signals to the I channel, the Q channel and then the I and Q channels simultaneously. The amplitudes are related in such a manner as to make it possible to calculate the quadrature error for each tone. The linear slope of the quadrature error versus modulation rate in radians/Hz is the timing skew error in seconds for the specific baseband setup condition.

Required Test Equipment

Test Equipment

Recommended Models

Alternate Models

Spectrum Analyzer

N9030B Opt 5xx1

N9030A Opt 5xx1
E444xA2

  1. Select any option of PXA spectrum analyzer (503, 508, 513, 526, 543, 544, 550) that has a maximum frequency greater than or equal to the maximum frequency of the unit under test.

  2. Select any model of PSA spectrum analyzer (E4440A, E4443A, E4445A, E4446A, E4447A, E4448A) that has a maximum frequency greater than or equal to the maximum frequency of the unit under test.

Connections and Setup Procedures
  • All test equipment requires a 30 minute warmup period to ensure accurate performance.
  • In the following adjustment setup, cables are designated as solid lines and direct connections are designated as dashed lines.
  1. Connect all test equipment as shown.
  2. Connect GPIB cables to all GPIB-controlled test equipment.
  3. While performing this adjustment, follow all instructions on the controller display.

 

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. If this adjustment fails with the equipment set up properly, refer to the troubleshooting section of the signal generator's 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 you cannot correct the problem using the troubleshooting procedures in the Service Guide, obtain service from Keysight Technologies. Refer to Contacting Keysight Technologies.