[time-nuts] Divider circuit for Rubidium Standard

[Bob Camp]

Hi

The simple answer is that a biased fast CMOS gate will do a better job
ADEV wise than your signal sources will. If you want that to also hold
for phase noise, run the gate on 5.5V and get the input signal as close to that
(5.5V p-p) as you can. 

Bob

> On May 22, 2015, at 6:29 PM, xaos <xaos at darksmile.net> wrote:
> 
> Bob,
> 
> This are all great questions.
> 
> 1. Let's assume that it varies from a HP Signal generator
> to a home built device. However, If I was to build it I
> would expect to pay more and get better specs.
> I have a few HP 3325B's and a few 8660C.
> I would probably use those as inputs but not always.
> 
> 2. Let's stick with the basics: 5-10Mhz.
> 
> 3. Again, basics: 1-7V peak to Peak.
> 
> 4. Ok, this is the real important question.
> The answer is, an amplifier of some sort.
> And that amp will probably feed something
> like a Test Instrument or some circuit I
> am building. What are my options?
> 
> For now, I'd like to simulate some of my simple
> designs as well as some designs suggested here.
> Then, see where it goes.
> 
> George
> 
> 
> On 05/22/2015 05:31 PM, Bob Camp wrote:
>> Hi
>> 
>> What is your objective? Put another way:
>> 
>> 1)  How clean is your sine wave source? 
>> 2) What frequency (or range) are you trying to convert?
>> 3) What level range are you trying to work with?
>> 4) What is it going into (how clean is the next stage)?
>> 
>> If you have an optical fountain that is good to 1x10^-15 at 1 second, and
>> you are trying to map Pluto with a radar in your back yard, the answer will
>> be a bit different than if you are starting with a surplus OCXO and trying 
>> to drive a 5334 :)
>> 
>> Bob
>> 
>>> On May 22, 2015, at 4:27 PM, xaos <xaos at darksmile.net> wrote:
>>> 
>>> After reading the posts on this subject I have a question.
>>> First, in my experience I used a rather simple circuit made from
>>> diodes used as limiters and a transistor feeding
>>> a logic inverter. No AGC.
>>> 
>>> So here is my question. What is the proper circuit to use?
>>> I'd like to do a PSPICE and check things out followed by
>>> a prototype.
>>> 
>>> I got that a comparator is out, etc.
>>> 
>>> Cheers,
>>> George H. N2FGX
>>> 
>>> On 04/26/2015 06:51 AM, Bryan _ wrote:
>>>> All:
>>>> 
>>>> Picked up a FE 5680B from Ebay awhile back. Appears to work fine, but is limited to a 1pps output. However there is a point on the PCB that's documented that has a 20Mhz output. There is actually a clean 60Mhz output as well.
>>>> 
>>>> http://www.ebay.com/itm/FEI-fe-5680b-rubidium-oscillator-With-1pps-20mhz-output-ONLY-10mhz-NEED-to-MOD-/291419889143?pt=LH_DefaultDomain_0&hash=item43d9fa9df7
>>>> 
>>>> I would like to tap this 20mhz output and feed it to a divider/buffer circuit for a 10Mhz output at 50ohm. Can anyone recommend a good schematic for such a purpose. I was looking at the project from David partridges web site http://www.perdrix.co.uk/FrequencyDivider/index.html
>>>> 
>>>> Cheers and thanks in advance.
>>>> 
>>>> -=Bryan=- 		 	   		  
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