Hi Octavio and other DSO enthusiasts,

I just drew up a preliminary design for an attenuator matching Octavio's
specs. I think it would work well. Have a look and please comment:

http://www.people.cornell.edu/pages/shb7/atten.jpg

Sorry for the large size, haven't had time to shrink it yet.

Sean


On Fri, 14 Aug 1998, Octavio Nogueira wrote:

> >   Octavio, I've been looking at a variety of front-ends and the one
> >mentioned below is very similar to the Linear Tech app note. I've tried
> >different wide-band amps following the FET buffer. I've also looked at the
> >recent Circuit Cellar Ink article and one in Electronics Now (May 98) as
> >well as many other circuits. All my work is very preliminary at this time.
> >I need to finish the logic analyzer first.
> >
> >   I've been following the discussion on using the Gameboy. I had no idea
> >that it's architecture was open or had so many resources available. My
> first
> >question is how fast can you sample data with a Gameboy? It seems that you
> >can only do a 1-2Mhz DSO with it. If that's so, there are less
> sophisticated
> >analog front-ends that would work fine. For example; one of the many
> >FET-input op amps. You would still get a decent bandwidth and a very low
> >input bias current.
> >
> >   - Tom
>
> As a matter of fact I'm looking for a variable attenuator with 1-2-5 steps.
> There is a lot of resources available for GameBoy development like
> assembler, C Compiler and simulators.
> The GameBoy would do just 1-2MHz DSO, but I'm planning a different approach
> to do a 30-40MHz DSO. The GameBoy will just control it and show the result.
>
> Regards,
>
> Octavio
> ======================================================
> Octavio Nogueira  - e-mail:   nogueira@mandic.com.br
> http://www.geocities.com/~oct_nogueira
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> ======================================================
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