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Power consumption tradeoffs of internal/external bias and single/differential antenna

Marty Shank
Intellectual 2100 points
Other Parts Discussed in Thread: CC2650

The following document explains the different tradeoffs with the various front end options:

processors.wiki.ti.com/.../CC26xx_HW_training_RF_Frontends_and_Antennas.pdf

The application is most concerned about actual power consumption vs. link budget/size.   

The CC2650 datasheet specs a current consumption Rx mode of 6.1mA (CC2650EM-5XD differential) and 5.9mA (CC2650EM-4XS - single ended).

Also specs Tx mode at  9.1mA but at 5dbm (CC2650EM-5XD differential) and 6.1mA at 0dbm (CC2650EM-4XS - single ended).

Trying to compare power consumption (Rx/Tx) like this but all at same Tx output dbm level for the 4 different options.

Do we have this data?

Also have same question for CC13xx but assume it would be very similar tradeoff.

  • 0
    TI__Mastermind 36395 points
    Marty,

    There will be small power consumption differences between each of the matching topologies due to the PA and LNA is loaded differently for each design. There will be differences between single ended mode and differential mode, in single ended mode you get a 3dB reduction in power due to the design not being push-pull configuration.

    Thomas