My customer is struggling to improve the 14.4GHz/28.8GHz spur on the AWR1843 prototype board.(Customer board)
https://www.ti.com/lit/an/spracp3c/spracp3c.pdf
Refered to P16 of spracp3c.pdf, the suppression method by changing the following register.
Customer tried to find this method, but reading RTRIM Modification Guide, cannot find the API in question.
Are there implementation guidelines?
5.3.2.2 Software Measures
APLL VCO RTRIM setting in BSS firmware:
- Emissions for 14.4 GHz and its harmonics can be reduced by changing the setting of the APLL VCO on
applicable mmWave devices. Appropriate APLL VCO RTRIM settings can decrease the magnitude of the
spurious emissions at 14.4 GHz and 28.8 GHz
- For detailed instructions on how to modify application software to change the APLL VCO RTRIM setting and
allowed values, refer to the following guide within the mmWave Industrial Toolbox:
<MMWAVE_INDUSTRIAL_TOOLBOX_INSTALL_PATH>/certification/RTRIM Modification Guide
Example Path: Industrial Toolbox or Navigate to Industrial Toolbox from mmWave Sensors
