Hi,
I am following the guidelines of firmware sc1894-fw410308-release-notes and trying to calibrate the PA on Rx/Tx mode of my modem.
PA is successfully calibrated with sc1894 on tx only mode and the rfpal is applying correction below are the screen shots for it.The rfin and rffb is in optimal conditoin as mentioned on datasheet and also can be seen in the screenshot. and spectrum of correction is also below.
It is written in the firware document for TDD considerations that
For systems with variable Rx/Tx duty cycle, the host controller can be used to scale the
measurement value by the duty cycle (D CYCLE ) and calibrate the PMU values with a 100% duty
cycle. Then the conversion of read PMU values into dBm values are as follow:
P RFIN =
P RFFB =
RFIN_PMU ∗ 3.01
+ OFFSET RFIN − 10 ∗ log10(D CYCLE )
1024
RFFB_PMU ∗ 3.01
+ OFFSET RFFB − 10 ∗ log10(D CYCLE )
but no procedure is mentioned how to do it, like how host controller is used to send spi commands to sc1894 for scaling the pmu values and what are the commands.
am i missing something that is mentioned?
Following is the screenshot of when modem is swtiched to rx/tx mode and sc1894 is stucked in CAL state whie in only TX mode it switches from CAL, FSA and then to TRACK state.
/resized-image/__size/1810x480/__key/communityserver-discussions-components-files/333/rx_5F00_tx.png
