[time-nuts] DMTD Mixer Terminations

[Bob Camp]

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
>> 
>> 
>> 
>> 
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>>   
> 
> 
> 
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