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LMR14030-Q1: Influence of spread spectrum for noise of FM radio(70MHz-100MHz)

Kuramochi Tadahiko
Guru 28715 points
Part Number: LMR14030-Q1
Other Parts Discussed in Thread: LMR14030

Hi,

Is SS also valid for reduction of noise of FM radio (70MHz-100MHz) ?

I'm understanding that spread spectrum(SS) can reduce average radiation energy and it should be valid for reduction of EMI.

However radio noise is audible even if the noise is moment, so I think that it should be discussed not average energy but peak energy.

I guess that SS is not valid for radio noise because spurious of Instantaneous peak value is not reduced.

What do you think about this?

Best Regards,

Kuramochi

  • 0
    TI__Mastermind 34745 points
    Hi,

    We talked this in email, you sent me a LMR14030 EMI result without SS on Oct 7. SS version can reduce the noise peak while the average or noise floor is slightly increased.

    The radio noise is audible maybe caused by PFM mode operation. ctm need to check switching regulator and load condition to make sure it work in CCM mode.