[time-nuts] GPS: ADEV or MDEV?

[Dr Bruce Griffiths]

Tom Van Baak wrote:
> Also an idea - is there an easy way to artificially increase Vref
> noise, by say 10x, so one could see if that change made any
> measurable change in OCXO output ADEV or phase noise?
>
> /tvb
>   
Tom

1) Increase the cutoff frequency of any low pass filter used.

2) With a discrete zener reference is to use a very low zener current.

3) Use a reverse biased base emitter junction of a small signal 
transistor as a zener at low current (don't reuse the transistor for 
small signal applications afterwards).

4) Inject noise from say a pseudorandom noise generator via a resistive 
network in the EC line.

If you havent got a pseudorandom noise generator (or one of the 
pseudorandom noise generator chips that chips National Semiconductor 
used to sell) you could try the method suggested in:
http://www.edn.com/article/CA200385.html



Bruce