ADRF5019 Insertion loss is reduced When I repeat switching test

Hi, 

I wonder if there is something wrong with the chip, ADRF5019.

I used this chip to implement SPDT Switch.

Now, It is under the test which is related to loss reliability to secure constant Insertion loss value after repeatedly switched.

Problem is this:

While Switching Repeat test, Insertion loss gradually decreases.

Count No. Switch
Result
0.5GHz 0.85GHz 0.9GHz 1.8GHz 1.9GHz 2.1GHz 3.5GHz 5GHz 6GHz
Min   -0.860 -0.941 -0.955 -1.185 -1.234 -1.204 -1.616 -1.932 -2.374
Max   -0.804 -0.878 -0.890 -1.093 -1.152 -1.116 -1.558 -1.862 -2.290
Average 0 -0.830 -0.906 -0.919 -1.129 -1.179 -1.148 -1.579 -1.888 -2.324
Max-Min   0.056 0.063 0.065 0.092 0.082 0.088 0.058 0.070 0.084
Stdev   0.013 0.015 0.015 0.020 0.017 0.016 0.009 0.013 0.014
1(17:07:56.865) Pass -0.851 -0.932 -0.948 -1.178 -1.226 -1.197 -1.595 -1.917 -2.343
2(17:07:59.058) Pass -0.852 -0.930 -0.948 -1.176 -1.230 -1.193 -1.597 -1.921 -2.355
3(17:08:01.304) Pass -0.856 -0.936 -0.946 -1.177 -1.228 -1.192 -1.592 -1.917 -2.353

39135(18:00:48.916) Pass -0.839 -0.922 -0.929 -1.130 -1.181 -1.151 -1.585 -1.899 -2.339
39136(18:00:51.209) Pass -0.839 -0.917 -0.933 -1.136 -1.182 -1.144 -1.585 -1.899 -2.336
39137(18:00:53.482) Pass -0.836 -0.920 -0.929 -1.141 -1.179 -1.147 -1.586 -1.898 -2.333

92574(04:54:41.480) Pass -0.816 -0.885 -0.904 -1.109 -1.166 -1.144 -1.578 -1.871 -2.309
92575(04:54:43.876) Pass -0.817 -0.888 -0.900 -1.110 -1.165 -1.136 -1.571 -1.875 -2.313
92576(04:54:46.278) Pass -0.814 -0.889 -0.900 -1.112 -1.160 -1.137 -1.570 -1.873 -2.313

Count no. is the number of switching repeated.

All the insertion loss get decreases when switching over and over again.

The more switching It repeats, the less Insertion loss It has.

You can see this graph that indicates insertion loss of SPDT.

This Phenomenon appears at all frequencies.

This is a very bad characteristic to SPDT switch which has to give a constant insertion loss regardless of the number of repetition.

Can you help me find the problem? 

Parents
  • Hi,

    Did you monitor the temperature change around the ADRF5019 IC? I saw you measured from 5pm to 5am, therefore, it was 12hr duration and if the temperature changed, it would also affect the insertion loss.

    Moreover, did you check the system variation over 12hr period? Any possibility to replace ADRF5019 with a well known reference and rerun?

Reply
  • Hi,

    Did you monitor the temperature change around the ADRF5019 IC? I saw you measured from 5pm to 5am, therefore, it was 12hr duration and if the temperature changed, it would also affect the insertion loss.

    Moreover, did you check the system variation over 12hr period? Any possibility to replace ADRF5019 with a well known reference and rerun?

Children
No Data