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  ADL5380-EVALZ test

Question asked by green512 on Apr 2, 2018
Latest reply on Apr 24, 2018 by dmailloux

On the website analog.com I found CN0374where 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

 

 

Input
 Phase RF
 to LO 
Average I 
Channel 
Output Code 
Average Q 
Channel Output
 Code 
Channel 
Voltage 
Channel 
Voltage 
Measured 
Phase 
Measured 
Receiver 
Subsystem Phase 
Shift 
-180°-5851.294+4524.038-0.893 V +0.690 V +142.29° -37.71° 
-90°-4471.731-5842.293 -0.682 V -0.891 V  -127.43° -37.43° 
+5909.982 -4396.769 +0.902 V -0.671 V -36.65° -36.65° 
+90°+4470.072+5858.444 +0.682 V +0.894 V +52.66° -37.34° 
+180°-5924.423+4429.286 -0.904 V  +0.676 V +143.22° -36.78° 

 

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

Figure 8. Receiver Subsystem Calibration GUI

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