Hi Poul-Henning,
On 01/06/2016 12:28 AM, Poul-Henning Kamp wrote:
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In message <[email protected]>, Magnus Danielson writes:
The white noise will be particularly annoying as it then converts to
jitter through the slew-rate limitation as you go into the
trigger-circuit.
Digitize the LPF output and do a curve-fit to find the zero-crossings ?
That would work. You could least-square fit it with very cheap
processing. The LPF would mainly need to reject the sum frequencies to
act as anti-aliasing filter, and the noise would be filtered out by the
least-square processing.
Estimating the phase and slew-rate, and then use those to calculate the
actual through-zero phase would not be too hard. As a consequence you
get a slew-rate monitor, which act as an observation of signal level.
Cheers,
Magnus
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