[time-nuts] DMTD Mixer Terminations
Bob Camp
lists at rtty.us
Fri Mar 5 01:12:07 UTC 2010
HI
In other words the hard part of the task still remains to be done.
Bob
On Mar 4, 2010, at 4:45 PM, Bruce Griffiths wrote:
> 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:
>> time-nuts-bounces at febo.com wrote on 03/03/2010 10:56:46 PM:
>>
>>
>>> From:
>>>
>>> Bruce Griffiths<bruce.griffiths at xtra.co.nz>
>>>
>>> To:
>>>
>>> Discussion of precise time and frequency measurement
>>>
>> <time-nuts at febo.com>
>>
>>> Date:
>>>
>>> 03/03/2010 11:03 PM
>>>
>>> Subject:
>>>
>>> Re: [time-nuts] DMTD Mixer Terminations
>>>
>>> Sent by:
>>>
>>> time-nuts-bounces at febo.com
>>>
>>> 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
>>
>>
>>
>>
>> _______________________________________________
>> time-nuts mailing list -- time-nuts at febo.com
>> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> and follow the instructions there.
>>
>>
>
>
>
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>
More information about the Time-nuts_lists.febo.com
mailing list