[GPS_Standard] EFC voltage "cleanliness"

[Dimitri.p]

If you built the controller on a breadboard, I'll 
say all bets are off as far as power supply issue go.

Depending on my power supply arrangement, I get -3.90e-09 by the 4th sample.

Try powering up the controller circuit from a separate power supply.
For testing you could even use a 9V battery 
feeding the 7805 regulator for a short time.
See what kind of difference it makes.
The general idea is to keep the power supplies 
separate so you can figure out which circuit is having the problem.

Dimitri



At 04:56 PM 10/11/2015, Dogma wrote:
>I should add, that this was just made on a 
>breadboard, chips are bypassed with .1uf caps 
>and power rail too, but it is noisy.Â
>
>
>Jim
>
>On Sun, Oct 11, 2015 at 4:54 PM, Dogma 
><<mailto:dogma2u at gmail.com>dogma2u at gmail.com> wrote:
>I am using a HP10811 and a sample size of 100, 
>it does better if i just ground the EFC line.
>
>
>Jim
>
>On Sun, Oct 11, 2015 at 4:52 PM, Dimitri.p 
><<mailto:dimitri at dotp.com>dimitri at dotp.com> wrote:
>Which oscillator are you using and what's the 
>largest sample size (S) you've tried ?
>
>Dimitri
>
>
>
>At 09:14 PM 10/10/2015, Dogma wrote:
>You are so right about the noise on the EFC 
>line, it's so bad. I am looking at making a 
>window comparator and isolator to solve this 
>problem, as mine never gets better that like 3.x-8
>
>
>