Rx1_L Calbration

#1

I wonder how the signal at the RX1_L is calibrated.
From the schematic there is not connection between the RX1_L input and the SPDT switches which perform calibration.

#2

Calibrations are done using chip’s internal loopback.

#3

Can we deduce when RX1_L (or RX2_L) is used, the external SPDT switches are completely unnecessary and can be removed? (It has been reported that the bypass caps can cause spurs at the multiples of 100 MHz).

#4

For calibrations it is not necessary, but I’m not sure if anything else might need it.