Use OsmocomBB as OpenBTS / airprobe clock generator

Sylvain Munaut 246tnt at gmail.com
Wed Mar 14 15:14:53 UTC 2012


Hi,

> I'd like to build a test scenario for my thesis based on a Motorola C123 and
> a PLL such as this
> http://search.digikey.com/us/en/products/ICS501MLFT/800-1036-1-ND/1916104
>
> Like this, I'd feed the multiplied clock to a USRP1 to run OpenBTS reliably.
> Would you help me choose the correct PLL if you understand the topic? I have
> little experience with circuit design.

That PLL looks fine, should work AFAICT.

Maybe just check the clock levels at the C123 output. If it's 2.5v
logic you may need to manually bias the PLL clock input and AC feed
the clock.

Cheers,

    Sylvain




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