[time-nuts] OCXO Voltage Input? (Bob Camp)

[Tom Van Baak (lab)]

Some OCXO schematics:
http://leapsecond.com/museum/10544/
http://leapsecond.com/museum/10811a/

/tvb (i5s)

> On Sep 5, 2014, at 5:50 AM, Dan Kemppainen <dan at irtelemetrics.com> wrote:
> 
> Hi Bob,
> 
> Being relatively new to this 'high end' time stuff, there's lots to
> learn...   So, how much bandwidth might a typical OCXO have on the EFC
> pin? My assumption is that it is very low, but I have nothing to back
> that up.
> 
> If I had 10Mhz or some other high frequency on the EFC line, would a
> typical OCXO respond to that?
> 
> The concern is that any HF noise on the power pins of the driving op-amp
> might make it onto the EFC line. Of course most amps have good PSRR at
> low frequencies. If the EFC pin only has low frequency response, there
> shouldn't be an issue.
> 
> Are there any OCXO schematics out on the web, that one could study?
> 
> Dan
> 
> 
> 
> 
>> On 9/5/2014 7:02 AM, time-nuts-request at febo.com wrote:
>> Hi
>> 
>> The EFC pin *might* have a bypass cap on it. If you drive it with an op-amp an isolating resistor might be needed. If so, a couple hundred ohms is likely enough to stabilize the op-amp.
>> 
>> In a closed loop / control loop setting, the noise on the EFC will be whatever the loop generates. As long as you stay with good quality op-amps and low impedances in your filters, things should be plenty quiet. 
>> 
>> Things like EFC range, output frequency, phase noise, and intended use  / circuit would be needed to come up with more specific information. 
>> 
>> Bob
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