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AM3358 Harmonic Issue at DDR Interface

Josh Conn
Prodigy 285 points

Other Parts Discussed in Thread: AM3358

I have a customer using the AM3358 with GPS and are seeing some unusual harmonics at 1572, 1578, and 1574 MHz. These frequencies are divisible by 6. Their RF engineer has sniffed the board and finds interference near the DDR interface. Are there any frequencies that are present in the DDR interface?

Thanks,
Josh Conn

  • 0
    TI__Guru**** 393215 points
    Hi John,

    What type of DDR memory do they use and at what DDR clock rate? Of course, there are "frequencies" across the DDR interface. DDR is dynamic memory, clocked by the processor, and there is continuous exchange of data over the interface, as Linux runs from DDR.