On 2022-02-25 10:23, Brian Padalino wrote:
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
Thanks, Brian. I missed that in my perusal of the schematic. I don't
have an N32x/N320 myself to test this.
That series cap will *remove* any DC bias, I would think. So, somewhat
intriguing.
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