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  • TI Thinks Resolved

CC1200: Noise vs Gain

Intellectual 2660 points

Replies: 7

Views: 86

Part Number: CC1200

Hi E2E,

Good day!

Do we have the noise vs gain graph of CC1200?

Best regards,

Franz

  • Could you please elaborate some on what you would use a graph like this for?

    Gain - Do you mean front end gain? 

     

  • In reply to TER:

    Hi TER,

    Yes. The Rx gain.

    Best regards,

    Franz

  • In reply to Franz Figueroa32:

    I don't believe we have a graph that shows noise (which noise?) vs front end gain.

    Typically the AGC is on meaning that the gain is set according to the input signal. To get the best possible sensitivity the AGC always starts with max gain. 

    Could you please elaborate some on what you would use a graph like this for? I assume the customer has requested this graph for some reason and knowing that reason would help covering what the customer needs to know. 

     

  • In reply to TER:

    Hi TER,

    Sorry for the late response.

    The customer wants to add an LNA upfront the CC1200 to improved the sensitivity. To make a good analysis the need the noise figure VS the gain of the CC1200.

    Best regards,

    Franz

  • In reply to Franz Figueroa32:

    They will gain about 3 dB of sensitivity using an external LNA. I have measured this both using CC1190 in RX and various Skyworks FEMs. I would assume it's possible to get somewhat better result but then the LNA has to have a very low noise figure meaning that both cost and current consumption will be very high. 

     

  • In reply to TER:

    Hi TER,

    Thank you for your help.

    My customer asked if RX AGC gain in function of the RX level? Also, is the measurement above done it actual boards?

    Best regards,

    Franz

  • In reply to Franz Figueroa32:

    Yes, the AGC gain is a function of input level. AGC_REF sets the level where the AGC start to reduce gain. 

    Yes, these are measurements done on multiple actual boards. 

     

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