ST25RU3993 eval low output level

[MPrzy.1]

Hello,

I've observed that output level on both antenna port is lower than is specified in datasheet. I've checked it on two eval boards. Below results:

For internal PA: (output level set/ measured level/ detector voltage

1. -12 / 4,5 dBm / 0 ,71V
2. -6 / 8,9 dBm / 0,81V
3. 0 / 12,2 dBm /0,89V

For external PA:

1. -12 / 14,4 dBm , / 0,92V
2. -6 / 19,5 dBm / 1,05V
3. - 3 / 20,8 dBm / 1,08V
4. 0 / 21,5 dBm / 1,1V

In both cases output level is lower by 7-8 dBm that expected. Any suggestion?

Best Regards, Michał

[MPrzy.1 · Accepted solution]

Problem probably solved and was in my spectrum analyzer malfunction.

Michal