🚀 go-pugleaf

blackhead wrote:
> On 20 July, 10:06, Ray <s...@spamalot.com> wrote:
>> blackhead <larryhar...@softhome.net> wrote
>> innews:0268880f-5658-44fe-8908-579f2f1031ba@s31g2000yqs.googlegroups.com:
>>
>>
>>
>>
>>
>>> On 19 July, 23:02, "David L. Jones" <altz...@gmail.com> wrote:
>>>> John Larkin wrote:
>>
>>>>> Do the scopes work?
>>
>>>> Yep, they work. So Rigol are obviously getting away with it by hook
>>>> or by crook.
>>>> If AD are deliberately under-speccing their normal chips, then
>>>> it's a clever ploy by Rigol to exploit it.
>>
>>>> Dave.
>>>> --
>>>> ---------------------------------------------
>>>> Check out my Electronics Engineering Video Blog &
>>>> Podcast:http://www.alternatezone.com/eevblog/
>>
>>> So give it a 1 Ghz signal and see if it it looks right then.
>>
>> Umm, no. Ever heard of Nyquist?
>>
>> Plus to see anything like a signal for your eye's benefit, you're
>> better
>> off with x10 sampling.
>>
>> So 100MHz is more on the mark. Does it allow you to simply plot the
>> points
>> without the "join the dots"?
>>
>> BTW if you had exactly 1GHz going in, and it manged to sneak pass
>> the front
>> end, you'd end up with a straight line at some DC level.
>>
>> Ray- Hide quoted text -
>>
>> - Show quoted text -
>
> I have heard of Nyquist, just forgot to apply him in this case :)

and you forgot about the analog bandwidth too, that's kinda important!

> There will be an anti aliasing filter in the front end so you wont see
> much if you put in anything close to half the sampling rate = 500Mhz.

Err, the front end bandwidth is only 50MHz!
Kinda hard for any signals higher than that to sneak past, as Ray said.

Dave.

-- 
---------------------------------------------
Check out my Electronics Engineering Video Blog & Podcast:
http://www.alternatezone.com/eevblog/