IWR6843: Effect of Xtal replacement on Tx output level

Hello T Murakami,

Your query has been forwarded to the concerned team member. They will assist you shortly with  your query. 

Thanks,

-Shareef

Hello Murakami-san,

It's not reasonable result. As long as electrical Crystal Electrical Characteristics meets the TABLE 8-5 requirements then mmWave IC performance should be similar. Could you please share your crystal par number used? Also it is possible if the the crystal doesn't get soldered properly then this kind of problem could be seen. Is this tried on single board or multiple boards? 

Thanks and regards,

CHETHAN KUMAR Y.B.

Hello CHETHAN-san,

Thank you for your reply.

Xtal per numer is XRCGB40M000F1S2GR0 of Murata.

>Is this tried on single board or multiple boards? 

single board.

I'll check soldering again.

Best Regards,

T.Murakami.

Murakami-san,

   Thank you for sharing the crystal details, load cap of the crystal is lower 6pf instead of 8pf and max ESR of the crystal is 60ohm, desired value is 50Ohm. However these values should not cause 10dB decrease in the Tx output power level. There must be some other issue other than the crystal part number. 

Thanks and regards,

CHETHAN KUMAR Y.B.

Specification of Murata's Xtal is below.

XRCGB40M000F1S2GR0|Ceramic Resonators/Crystal Units/MEMS Resonators|Timing Devices|Murata Manufacturing Co., Ltd.

I think this Xtal meets the TABLE 8-5 requirements.

Am I wrong?

And I re-evaluate when change the Xtal.

As a result, we found that the level of TX did not change.

Sorry for confusing you.

Best Regards,

T.Murakami.

Hello Murakami-san,

    Thank you for sharing the crystal specification. Yes it meets the TABLE 8-5 requirements.  

Sorry, just to reconfirm, Is the Tx power level is as expected or still you are seeing 10dB lower level with this crystal change? 

Thanks and regards,

CHETHAN KUMAR Y.B.

Hello CHETHAN-san,

>Sorry, just to reconfirm, Is the Tx power level is as expected or still you are seeing 10dB lower level with this crystal change? 

Tx power level is as expected.

Best Regards,

T.Murakami.