R
RichD
Guest
Some time back, I attended a seminar of a mathematician
at SLAC. Â He discussed the information contained in phase,
and the impossibility of measuring this at optical frequencies.
To illustrate, he presented some phase diagrams. He
played around with those, to show the information contained -
and missing.
It was misleading, as those were derived from 2-D magnitude
images; i.e. sample the magnitudes, run the digital filters,
extract the phase domain. Those phase diagrams weren\'t
real sampled data.
Phase is proportional to time delay. So let\'s talk time
domain circuitry and sampling. If you\'re satisfied with
90* resolution, what\'s the highest frequency one can
sample, state of the art, using interleaved techniques and
whatever cleverness?
--
Rich
--
Rich
at SLAC. Â He discussed the information contained in phase,
and the impossibility of measuring this at optical frequencies.
To illustrate, he presented some phase diagrams. He
played around with those, to show the information contained -
and missing.
It was misleading, as those were derived from 2-D magnitude
images; i.e. sample the magnitudes, run the digital filters,
extract the phase domain. Those phase diagrams weren\'t
real sampled data.
Phase is proportional to time delay. So let\'s talk time
domain circuitry and sampling. If you\'re satisfied with
90* resolution, what\'s the highest frequency one can
sample, state of the art, using interleaved techniques and
whatever cleverness?
--
Rich
--
Rich