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LMQ66430-Q1: DRSS over PRSS

Part Number: LMQ66430-Q1

Hello expert,

I'm wondering how much performance DRSS outperforms PRSS in the high frequency band(30MHz - 108MHz)

Could you please let me know?

Thank you.

  • Hello

    Here is what our EMI expert says:

    "Near 30MHz the DRSS will have slightly better attenuation because it has wider spread of the fundamental due to the triangular modulation.

    Near 100MHz the attenuation will be the same because the narrower spread of the PRSS will have gone through enough harmonics to have completely spread the energy

     At the 100MHz frequency both DRSS and PRSS are relying on the quick cycle by cycle frequency changes of the of the PSRR to spread the frequency seen by the 100KHz pk detector circuit in the EMI receiver.  (remember DRSS is triangular + Pseudo Random + triangular modulation frequency modulation)"