Hi Carsten
I'm indeed using a similar setup where a TCXO is used as HE clock.
The PPS triggers a 32 bit capture and the SW PLL controls the Vtune of
the TCXO
The PPS is generated using another timer which gives me the possibility
to either output a PPS or 10MHz
I'm using a TCXO because of cost, power consumption and size reasons
and the performance is good enough for my application.
An OCXO would for sure perform better.
Erik.
On 14-4-2022 23:44, Carsten Andrich wrote:
Hello Erik,
could you elaborate on your setup? Which oscillator (OCXO?) are you
using to drive the STM32's PLL?
I'm currently toying around with a (presumarly?) similar
configuration. An RCB-F9T's 1PPS fed into an STM32G4's 32-bit timer
capture to reference the 1PPS to a local oscillator with ~6 ns
resolution, subsequently generating a stabilized 1PPS using another
output channel of the same timer. The STM32's PLL is still using a
cheap chrystal, but I'm currently working on replacing that with an OCXO.
Best regards,
Carsten
On 01.04.22 18:19, erik at kaashoek.com (Erik Kaashoek) wrote:
Nice, I'm trying to do something similar. But without the PICdiv or the
TIC measurement. Only the GPS PPS into the STM32 and the stabilized PPS
is generated by a timer in the STM32
First step was to measure against the running average of the GPS PPS.
As can be seen in attached Timeplot measurement the phase error is (when
temperatures stabilized) in the order of 10ns.
Erik.
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