On the website analog.com I found CN0374, where it is used ADL5380-EVALZ to measure magmitude and phase. I have a test system like CN0374, as shown in figure .
Figure 1. Simplified Test System for Magnitude and Phase Measurements
As shown in Figure 2, the test system is implemented using the ADF5355 RF Generator,ADL5380-EVALZ, EVALAD7903SDZ, and EVAL-SDP-CB1Z evaluation kits. Tow 11.6 dBm, 2.5GHz signal with phase shifts of +180°are provided the RF and LO input signals of ADL5380-EVALZ.
Figure 2. Test System for Magnitude and Phase Measurements
The measurment result is shown in figure 3. It's not same as table 2 in the CN0374. I don't kown what's the problem?
Figure 3. Test Result
Table 2. Measured Phase Shift for 0 dBm RF Input
When I chane the phase shift in another system as shown in figure 4, the result isn't changed.
Figure 4 Another test system for change the phase
Figure 5 Test Result of another system
Another question is why the AD7903 Evalution Software don't have calibration GUI as figure 8 shown in CN0374?
Figure 8. Receiver Subsystem Calibration GUI
We just recently updated the CN0374 software with the calibration routine as shown on figure8. For the guaranteed performance we recommend to use ADA4940-2. You can set the gain value as shown in figure1 of the CN0374.