On Fri, Feb 25, 2022 at 10:22 AM Marcus D. Leech <patchvonbr...@gmail.com> wrote:
> On 2022-02-25 10:17, David Raeman wrote: > > Hi all, I’d like to provide an external 10MHz sinusoidal clock to an > N320. The clock signal level is below the 10dBm max spec for this radio, > however it’s a bipolar sinewave (1.8Vpp, centered at 0V). I think this is > somewhat common for sinewave oscillators. The N320 documentation isn’t > clear on whether this is acceptable, or whether the external clock must > have a DC bias even if its sinewave. Looking at the schematic, the clock > feeds into a TI CDC3RL02, which seems to indicate the sinusoid must have DC > offset applied to keep it above ~0.3V. Can somebody please confirm? > > > > Thanks! > > > > It seems likely that you'll need that DC offset to keep the TI chip happy. > C2000 in the schematic ( https://kb.ettus.com/images/f/f4/USRP_N3XX_MB_Schematic.pdf) AC couples your signal so it's biased by the N320. I think you should be fine. Brian
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