AWR6843: Requirement for crystal ESR

Hello Kei,

Based on the negative resistance we can generate in our osc design , the max ESR spec is decided. 

Regards,
Vivek

Hello Vivek,

Thank you for your answer. I understand.
Also I guess if ESR is larger, phase noise is larger. Do you have any ideas if this affects radar characteristics?

Regards,
Kei

Hello Kei,

I dont think it will impact the phase noise. It just impact the oscillator circuit.

Regards,
Vivek

Hi Vivek,

I suppose if ESR is larger, Q of resonant circuit is smaller, so it affects phase noise. Is my understanding correct?

Regards,

Kei

Hello Kei,

The internal negative resistance of of oscillator will cancel out the Xtal ESR to provide a high Q and build oscillations. So as long as we are able to generate the negative resistance required to build the oscillations  the ESR does not matter, ie the max ESR should be within 50ohms.

Regards,
Vivek

Hello, Vivek,

Thank you for your reply.

Therefore you don't have knowledges that how phase noise affects radar characteristics?

Regards,
Kei

Hello Kei,

I understand how phase noise impacts radar characteristics. What I am trying to say is that the xtal ESR does not impact the RF synthesizer phase noise. I hope you understand the difference. 

regards,
Vivek 

Hi, Vivek,

Thank you for your reply. I understand.

I would like to know how phase noise impacts radar characteristics.
Could you let me know that?

Regards,
Kei

Hi, Vivek,

Thank you for your answer. I understand.

Regards,
Kei