[time-nuts] HP10514B Mixers

[Bob Camp]

Hi

I suspect that DC balance might well be important to a phase detector. 

Bob


On Mar 30, 2010, at 9:35 PM, Mike Feher wrote:

> Bob -
> 
> At the time I was more interested in DC balance and not noise. The op-amp in
> our application provided adequate isolation. For our application at the time
> they worked great. Regards - Mike
> 
> Mike B. Feher, N4FS
> 89 Arnold Blvd.
> Howell, NJ, 07731
> 732-886-5960
> 
> 
> 
> 
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Bob Camp
> Sent: Tuesday, March 30, 2010 9:25 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] HP10514B Mixers
> 
> Hi
> 
> The obvious question is weather you need a real good mixer to make a low
> noise phase detector. 
> 
> Sorting the diodes as you did resulted in a mixer that performed at a
> specific level. Better matching would have made it have more isolation as a
> mixer, it might have helped the conversion loss by a fraction of a db. Would
> it have also done something good for the phase detector characteristics?
> 
> If the answer is "not really", then one could pick diodes for low 1/f noise
> and do a simple match up on them. You might get some pretty good phase
> detectors real cheap. 
> 
> Bob
> 
> 
> On Mar 30, 2010, at 8:52 PM, Mike Feher wrote:
> 
>> I do not believe that I am familiar with the 10514B. I probably have about
> 6
>> or so 10514As with BNC connectors (most in a metal case and a few in
> epoxy),
>> and, I recall from about 40 years ago a 10514A that was a small little
> black
>> cube with leads for mounting on a PC board. Naturally, I had to take one
>> apart back then as that was the fun part. In the late 60's I designed a
>> thick-film phase detector that was used in an ASW system, where I simply
>> matched the hot carrier HP diodes for a fixed voltage drop at a given
>> current. We also wound the toroids, and had an op-amp on the output. Wow,
>> that was ages ago. Regards - Mike
>> 
>> Mike B. Feher, N4FS
>> 89 Arnold Blvd.
>> Howell, NJ, 07731
>> 732-886-5960
>> 
>> 
>> 
>> 
>> 
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