AFE7422EVM: RX data is not good in Mode4,at 2.6GHz at 3.5GHz

Li Yang

Prodigy 100 points

Part Number: AFE7422EVM

1 spectrum of RX at 3.5 GHz，there is a very high spur on the right. the left of spectrum is not good.

2 spectrum of RX at 2.6 GHz， there is a very high spectrum in the red circle in the picture

over 1 year ago

0 jim s over 1 year ago

TI__Guru* 91947 points

Li,

We are looking into this.

Regards,

Jim

0 Li Yang over 1 year ago in reply to jim s

Prodigy 100 points

Jim,

do you have any progress recently？

Regards,

0 Vijayendra Varma Siddamsetty over 1 year ago in reply to Li Yang

TI__Genius 10505 points

Li,

Sorry for the delay. We were out of office last week.

The spur on the right of the spectrum in 3.5GHz band is a 3686.4MHz which is 5*fs/4. The level of this spur is not expected to be this high though.

Regarding the other two multiplicative spurs (looks like a band similar to the input signal), can you test with a single tone input? This will help identify the spur easily. We will test with a single tone in our lab and get back to you.

Regards,

Vijay

RF & microwave

RF & microwave forum

AFE7422EVM: RX data is not good in Mode4,at 2.6GHz at 3.5GHz