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CC2533 2nd harmonic (4.8Ghz) Fail

Chanho No
Intellectual 790 points
Other Parts Discussed in Thread: CC2533

Hello,

Our customer is using the CC2533 and is failing(5dB) emmission at 2nd harmonic(4.8Ghz).

They improved emmision level by adding cap in parrell with Rbias(Pin30. 56K).

I found the below content.

https://e2e.ti.com/support/wireless_connectivity/f/158/t/353371   

'I would like to avoid a cap to the Rbias bin since this lowers the phase margin of an internal opamp.'

Is it impossible to add cap at Rbias pin? If possilbe, what value cap is possilbe?

If there is other method to improve 2nd harmonic, please let me know.

Thanks.