Am 24.10.2015 um 22:21 schrieb Bruce Griffiths:
On Saturday, October 24, 2015 09:03:21 AM Charles Steinmetz wrote:
The spec sheet says both TimePod inputs accept -5 to +20dBm into 50
ohms. -5dBm is less than 0.4Vp-p, which requires less than +/-4mA
from the source, so a 0-5v comparator output feeding a
capacitor and a 560 ohm series resistor should work fine as long as
the comparator can source and sink at least 4mA.
The fly in the ointment is that with such low level inputs (the LTC6957-4
evaluation board will deliver +4dBm into 50 ohm) the Timepod phase noise
floor is uncomfortably close to the phase noise floor of the LTC6957.
Alternatively, a 0-5v comparator output could be buffered with three
'AC04 inverters in parallel, or an 'AC line driver -- but that adds s
the PN of the gates.
Not if one uses a pair of drivers one to drive the Timepod Ch0 input and
one to drive the Timepod CH2 input.
...
It would perhaps be useful to measure the PN characteristics of several
comparators and other sine to square converter circuits using a Timepod
or equivalent.
For the sake of repeatability, could we agree on a common setup?
Timepod would be ok for me. Levels, sources, filters, splitters...
regards, Gerhard
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