# 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 -1.13 -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 -0.92 -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 -0.9 -1.11 -1.165 -1.136 -1.571 -1.875 -2.313 92576(04:54:46.278) Pass -0.814 -0.889 -0.9 -1.112 -1.16 -1.137 -1.57 -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?