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[DPRG] Re: Need help debugging a XTAL colpitts oscillator

Subject: [DPRG] Re: Need help debugging a XTAL colpitts oscillator
From: Ray Xu rayxu123 at gmail.com
Date: Fri Jun 25 16:49:29 CDT 2010

Thanks Jeff!

Ray Xu

On Wed, Jun 23, 2010 at 11:46 PM, Jeff Koenig <koenig.jeff at gmail.com> wrote:

> Hey Ray -
>
> Haha!  You haven't wasted anyone's time.  Kip's suggestion was a very good
> one.  Matter of fact, you didn't even waste much of your own, although it
> probably feels like it right now.
>
> You've learned a great lesson that some people take decades to learn, if
> ever.  ALWAYS be suspicious of your instruments!  Digital o'scopes, in
> particular, are great at aliasing under certain conditions.  They don't
> really "lie", but they're only telling you what they see to the best of
> their ability.  Get to know Nyquist, aliasing and other o'scope limitations
> early on, and you'll do just fine.
>
> Congratulations to you for not giving up!
>
> -Jeff
>
>
> On Wed, Jun 23, 2010 at 8:28 PM, Ray Xu <rayxu123 at gmail.com> wrote:
>
>> Hey Kip,
>>
>> Thanks for the info.
>>
>> I found out that this signal of mine is indeed a "ghost signal".  In a
>> short wrap, my scope was aliasing the signal at higher time scales...
>>
>> So, basically, I've been trying to solve a problem that doesn't exist for
>> the past week...Wow, I feel stupid of myself that I got myself into this
>> kind of situation...
>>
>> Sorry for wasting your time
>>
>> Thanks,
>>
>> Ray Xu
>>
>> On Wed, Jun 23, 2010 at 7:47 AM, Kipton Moravec <kip at kdream.com> wrote:
>>
>>> I think you are on the right path with the decoupling capacitors.
>>>
>>
>
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