CC3100: Spurious emission test code for FCC and CE, how to enable the continuous transmit mode and select the b/g/n

Hi Jan,

We are testing our product with CC3100 chipset, we are getting 260Mhz and 470Mhz radiated emissions.

I like to know what is the operating frequency of wireless MCU? which document I can find the operating frequency of Wifi MCU.

Rgds

Chandra

Hi Chandra,

I am not able provide information what can cause radiated emissions at 260 and 470MHz. Please wait for response from TI side.

Meantime provide here results of tests from spectral analyser.

Jan

Hi Jan,

attached the graph.

Rgds

Chandra

Chandra,

How are you performing these tests? Are you using Radio Tool? looking at our test reports, I do not see spurs at those frequencies. I would suggest reviewing our design guide and making sure you followed everything, especially around the DCDC area.

Let me know if you see any problems with your layout and need clarification.

Also, Can you describe the testing setup? Are you accurately accounting for gains and losses of cables and antennas? Are you using the EMUBOOST and a PC to run the experiment? Is PC in a shielded box?

Regards,
Vince Rodriguez

Hi Vincent,

Sorry for late reply, it seems in my layout SPI clock is routed very close to DC-DC regulator and Software team configured the SPI clock to 45Mhz.

I think we need to change SPI clock to below 24Mhz as specified in cc3100 datasheet. We yet to get to final round of testing, will update shortly.

Rgds

Chandra