[hpsdr] Odyssey Siren Design

[Ahti Aintila]

Thanks Bob for the comment.

Dan's early statement would be interesting, too. Is your Laplace
analysis available without any extra trouble for you?

Before I decided to make the present circuit, I considered also
deBoo's integrator, but that would have consumed more components:
<http://www.elecdesign.com/Articles/Print.cfm?AD=1&ArticleID=1633>
I also studied B Vinnakota's et al. article:
<http://delivery.acm.org/10.1145/220000/217569/p450-vinnakota.pdf?key1=217569&key2=0044778511&coll=&dl=ACM&CFID=15151515&CFTOKEN=6184618>.
Maybe, something useful may be found in that article.
After all, the fully differential opamps seem to be the ideal solution
in this case. There are a lot of application notes how to use them.
Here are a couple of examples:
<http://focus.ti.com/lit/an/sloa072/sloa072.pdf>
<http://focus.ti.com/lit/an/sloa099/sloa099.pdf>

73, Ahti OH2RZ


On 20/09/06, Bob McGwier <n4hy at idaccr.org> wrote:
> Ahti:
>
> The final piece of the puzzle that fit this together for Phil C, you,
> etc.  and led to my laplace transform analysis of your and Phil C's
> original proposals was Dan Tayloe suggesting that the QSD should be
> viewed as an integrator and that the capacitors in his unbalanced design
> and in Gerald's balanced QSD design were only rough approximations to
> it.   The dominant terms in the Laplace transform analysis (the perfect
> tool for both transient and longer term response) turned out to be
> ........  AN INTEGRATOR with a twist.  Your circuit has the integrator
> with the twist.    Dan's comment was the first time I went "AHA!" and
> was the last piece of the mental puzzle for me personally.   It was the
> first time I had a Gestalt of the actual underlying theory of operation
> instead of just plugging things into some simulator and fiddling around
> until things looked better.    If necessary,  I can dig out the very old
> note to the softrock group where Dan makes this statement.
>
> I am certain in my own mind that you and Phil have gotten this to the
> point where this can proceed to alpha test this and get circuit boards
> out for full scale analysis.   Horton, Phoenix, whatever,  needs to have
> this circuit closely coupled, gain/impedance matched to the follow on
> A/D for noise immunity and to get the promise this circuit holds for
> dynamic receiver performance.  I suggest that this is the next step.
>
> Congrats,
> Bob
> N4HY
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