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'Another PIC based DSO project'
1998\08\07@113427 by Martin Green

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    Yesterday I got my August 1998 issue of Circuit Cellar INK in the
    mail, and it has an article and construction project that fits right
    in with the recent discussions here about a PIC based DSO project.

    This project is an entry into the Circuit Cellar/Microchip Design 98
    contest, and is interesting in that it is a mixed signal analyser, not
    just a DSO. It combines a 50MS/s logic analyzer, and 50MS/s DSO with
    100 MHz vertical amplifiers (allows subsampling 100MHz signals at
    50MS/s), with a common trigger, allowing a digital pattern match to
    trigger an analog trace, and vice-versa. Communication with the host
    is via RS-232, and the host can be any of a number of platforms. The
    control software is generic and can be ported to almost any OS and
    hardware and the hardware is designed to allow 3rd party expansion.

    All schematics are provided, and no esoteric devices are used. Even
    the PIC is just a lowly 16F84.

    If nothing else, this project could provide the design for stable
    100MHz input amplifiers.


    CIAO - Martin.

1998\08\07@114428 by Don

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This project sounds very interesting and I would dive in if I werent
covered up right now with other projects. I know this is way off topic,
so maybe martin or someone could respond to my question by email. Is
this typical of the circuit cellar magazine? I'm not familiar with it,
but maybe I should subscribe if it has this caliber of articles. What is
the scope of the publication (digital, analog, rf, general)? I saw a
reference to it somewhere before, but I assumed it was like popular
electronics or some such. If it doesnt have 25% fluff and 70% adds, and
doesnt cost an arm and a leg, maybe its for me.

Thanks
Don
email...  spam_OUTbjmcpherTakeThisOuTspamusit.net



Martin Green wrote:
{Quote hidden}

1998\08\07@132827 by Martin Darwin

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You can check it out at

http://www.circellar.com (the article is online)

or

http://www.bitscope.com

MD

On Fri, 7 Aug 1998, Martin Green wrote:

{Quote hidden}

1998\08\08@115826 by Claudio Rachiele IW0DZG

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                  Status Distribution August 07, 1998 15:31:26

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1998\08\08@134325 by Claudio Rachiele IW0DZG

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                  Status Distribution August 07, 1998 17:23:56

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1998\08\11@074219 by Tom Handley

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  Martin, I looked at that article and found it very interesting. For DSO
applications, he provides a nice front-end. All I've done in that area is
run simulations under Electronics Workbench v5.1 using vendor supplied SPICE
models from Analog Devices, Maxim, and Linear Technology. I'm leaning
towards a resistive divider to scale the input instead of a PGA. I've been
`playing' with a modified FET-input front-end from a Linear Tech app note.
in their 1993 "Linear Applications Handbook Volume II". This is AN47; "High
Speed Amplifier Techniques. A designer's Companion for Wideband Circuitry".
This covers a wealth of information including the "ABC's of Probes"
contributed by Tektronix. One application is a 100Mhz servo controlled FET
input amp with a 10M/3pf input and 100pa bias current. In addition to the
bandwidth, it seems to have a good DC response.

  - Tom

At 10:20 AM 8/7/98 -0400, Martin wrote:
{Quote hidden}

Tom Handley
New Age Communications
Since '75 before "New Age" and no one around here is waiting for UFOs...

1998\08\12@101722 by Octavio Nogueira

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Would you mint to share your front end with me? I'm developing a Gameboy
DSO.

With best regards,

Octavio
======================================================
Octavio Nogueira  - e-mail:   nogueiraspamspam_OUTmandic.com.br
http://www.geocities.com/~oct_nogueira
"ProPic" Production PIC Programmer Windows under US$20
======================================================
-----Mensagem original-----
De: Tom Handley <@spam@thandleyKILLspamspamTELEPORT.COM>
Para: KILLspamPICLISTKILLspamspamMITVMA.MIT.EDU <RemoveMEPICLISTTakeThisOuTspamMITVMA.MIT.EDU>
Data: Terça-feira, Agosto 11, 1998 08:39
Assunto: Re: Another PIC based DSO project


>   Martin, I looked at that article and found it very interesting. For DSO
>applications, he provides a nice front-end. All I've done in that area is
>run simulations under Electronics Workbench v5.1 using vendor supplied
SPICE
{Quote hidden}

not
{Quote hidden}

1998\08\14@102628 by Tom Handley

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  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

At 11:15 AM 8/12/98 -0300, Octavio Nogueira wrote:
{Quote hidden}

Tom Handley
New Age Communications
Since '75 before "New Age" and no one around here is waiting for UFOs...

1998\08\14@115306 by Octavio Nogueira

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>   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:   EraseMEnogueiraspammandic.com.br
http://www.geocities.com/~oct_nogueira
"ProPic" Production PIC Programmer Windows under US$20
======================================================

1998\08\14@135920 by Sean Breheny

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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:

{Quote hidden}

1998\08\14@173604 by Octavio Nogueira

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>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

This is great Sean but I need something controlled by a PIC and not with
mechanical switches.

Regards,

Octavio
======================================================
Octavio Nogueira  - e-mail:   RemoveMEnogueiraspam_OUTspamKILLspammandic.com.br
http://www.geocities.com/~oct_nogueira
"ProPic" Production PIC Programmer Windows under US$20
======================================================

1998\08\17@090201 by Sean Breheny

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Hi again Octavio et al,

Well, to convert it to something controlled by a PIC would simply require
a few analog switches. I'll see if I can come up with a modification to
include these.

BTW, a couple of small corrections to the schematic, the caapacitor on
the "x5" part of the network should be .25*C, not 4*C. These values are
simply a guide as to what the middle of the trimmer's range should be.
Also, instead of having the resistors marked "R" in series with the
protection diodes, there should be a medium value resistor (a few k) in
series with the signal path between the switch and the diodes.

Sean


On Fri, 14 Aug 1998, Octavio Nogueira wrote:

{Quote hidden}

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