RF Calibration#

This section describes the RF calibration steps to adjust the XO CTUNE, gain offset, and EVM offset in the SiWG917 device.

Note:

• Refer to the section Manufacturing Utility Commands – Parameters for the description of the parameters used in the following sections of commands.

• The --skipload parameter is used to skip loading the manufacturing firmware. This will save manufacturing time during mass production.

• The first command given to the device when powered ON, should not have --skipload, since the manufacturing firmware needs to be loaded.

Steps for CTUNE Adjustments#

The following table shows the steps for adjusting the CTUNE and storing it in flash or eFuse.

Example: SiWG917M111MGTBA – CTUNE Adjustment Steps#

1. Setup the radio and start transmission

   commander manufacturing radio --channel 1 --power 10 --phy 1MBPS –start -d SiWG917M111MGTBA

2. Measure the frequency

3. Adjust the CTUNE value (Offset = measured frequency (in kHz) – 2412000)

   commander manufacturing xocal --offset <Offset> --skipload -d SiWG917M111MGTBA

4. Store the CTUNE value

   • Store in Flash

     commander manufacturing xocal --store --skipload -d SiWG917M111MGTBA

   • Store in eFuse

     commander manufacturing xocal --store --storeinefuse --skipload -d SiWG917M111MGTBA

Steps for Gain Offset Adjustments#

The following table lists the steps for adjusting the gain offset and storing it in flash or eFuse.

Example: SiWG917M111MGTBA – Gain Offset adjustment steps#

1. Setup the radio and start transmission

   commander manufacturing radio --channel 1 --power 16 --phy 1MBPS –start -d SiWG917M111MGTBA

2. Measure the output power

3. Calculate the offset to meet the expected output power

   Offset = ceil ((output power measure (dBm) + cable loss -- 16) * 2)

4. Store the gain offset value

   • Store in Flash

     commander manufacturing gain --ch1 <gain ch.1> --ch6 <gain ch.6> --ch11 <gain ch.11> --ch14 <gain ch.14> --store –skipload -d SiWG917M111MGTBA

   • Store in eFuse

     commander manufacturing gain --ch1 <gain ch.1> --ch6 <gain ch.6> --ch11 <gain ch.11> --ch14 <gain ch.14> --store --storeinefuse --skipload -d SiWG917M111MGTBA

5. Stop radio transmission

   commander manufacturing radio --stop --skipload -d SiWG917M111MGTBA

Notes:

• The gain offset updated in flash with the preceding command in step 4. To force the usage of this gain offset in flash even though the whole calibration data is in eFuse, You need to give the EVM offset command mentioned section EVM Offset.

• This serves as an enable for gain offset to pick from flash when the remaining calibration data is in eFuse.

• There can be a variation of up to +/- 2dB in power across parts at Typical/Room temperature.

• It is recommended that the user makes the "Customer Gain-offset" correction on customer-end products to correct for IC part-to-part variation and insertion-loss variations in the RF front-end on customer boards. This calibration process would ensure accurate Transmit power control for Regulatory compliance @ volume production.

EVM Offset#

Following is the syntax of the command to set the EVM offset. You can apply the offset for the rates where EVM is passed. Any of the offsets mentioned further for the respective data rates will have the offset applied.

Syntax:

commander manufacturing evmoffset --off0 <offset 11B> --off1 <offset 11G,24Mbps 11N,MCS0-2> - -off2 <offset 11G,54Mbps 11N,MCS3-7> --off3 <offset 11N,MCS0> --off4 <offset 11N,MCS7> --store – storeinefuse --serialinterface -d <OPN Number>

Example:

commander manufacturing evmoffset --off0 0 --off1 0 --off2 0 --off3 0 --off4 0 –store -d SiWG917M111MGTBA

• This command updates the flash with all the evm offsets with 0 along with a magic byte.

Note: This magic byte when used in flash acts as a enabler for picking gain offset from flash even the whole calibration data is in the eFuse.