nRF9160 COEX0 assertion to LNA powerup

[gwagner_emf]

We're using the nRF9160 in our application with an external GPS antenna that contains an LNA.

Looking to use a load switch to apply power for the LNA when COEX0 is asserted (as per the 9160 reference documents).

In looking at the various load switches available there is quite a variance in the startup time (from almost instantaneous to 1000us).  Is there any requirement for COEX0 to LNA powerup timing?  I'm assuming that if it's a bit slow it won't matter since the GPS algorithms will still be trying to acquire signal.

Thanks,

-- Glenn

[JONATHAN LL]

Hi Glenn, 

For good condition hot fix the TTFF is 1.3 seconds, so having a load switch that has a 1 millisecond delay does not have any significate impact on the acquisition time. 

Regards,
Jonathan