The specifications for the maximum output given on the datasheet are so
wide that the 20% higher than typical beat frequency amplitude may well
be within spec.
The RPD-1's were being over driven by about 2.5dBm or so, which would
also tend to increase the output.
A test made with 500 ohms to ground as shown in a Minicircuits
application note had about the same output as when terminating the IF
port in 50 ohms + 47nF.
The remaining questions are:
1)What effect does the IF port termination have on the phase detector
phase noise spectrum?
2) What effect does the IF port termination have on the noise to phase
detector gain ratio?
Bruce
Joseph M Gwinn wrote:
[email protected] wrote on 03/03/2010 10:56:46 PM:
From:
Bruce Griffiths<[email protected]>
To:
Discussion of precise time and frequency measurement
<[email protected]>
Date:
03/03/2010 11:03 PM
Subject:
Re: [time-nuts] DMTD Mixer Terminations
Sent by:
[email protected]
Whilst your corrected measurements for the 10534 and 10514 are now
within about 10% of those found by NIST for one of their mixers, the
discrepancy with Minicircuits estimates for the RPD-1s is somewhat
larger but their phase detector gain specs seem incompatible with their
max output specs.
The diode ring mixers MiniCircuits offers as phase detectors are usually
designed for and characterized at 500 ohms load, not 50 ohms. Does this
resolve the discrepancy?
Joe
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