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CC1125: PA Power Ramping Control

Edward Harris
Prodigy 10 points
Part Number: CC1125


Tool/software:

Hello,

I have a system using the CC1125 at two different symbol rates, one about 20x faster than the other.

I have noticed that the SmartRF Studio defaults for the PA Power Ramping Control are the same for all settings of carrier frequency and symbol rate (0 to 1/8 to 11/16 to full power over 3 symbol times).

This means the ramp time for the slow data rate is about 20x slower than for the higher data rate.

As I am using the CC1125 in a battery powered application I would like to reduce the amount of time the RF is on for.

Given I have no EMC issues with the faster data is there any reason why I shouldn't make the slower data rate ramp time faster by dropping the ramp time to 3/8 symbol time and then the slow data rate ramp time will only be 2.5 times slower than the faster data rate?

Thanks,

Ed.

  • 0
    TI__Mastermind 33810 points

    Hi,

    It is always recommended to follow the values in SmartRF studio since these were derived from the characterization of the chip. When the chip is characterized we always try to have as much design margin as possible for the complete temperate and voltage region for all chip batches. So it is possible to reduce standard switch times but this has to be done at you own risk. 

    Recommend to test with the faster ramp settings over temperate and voltage as well just to gain more re-assurance.