[hpsdr] ISD Theory References?

[Rob Frohne]

Thanks Cecilio,

That is neat.  I just fired it up and what do you know, it just works! 

Again, thanks,

Rob

Cecilio Bayona wrote:
> Rob Frohne wrote:
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>>
>>
>> ------------------------------------------------------------------------
>>
>> Hi,
>>
>> Pardon my ignorance; I haven't been party to all the discussion going 
>> on with the ISD, and I'd like to be brought up to speed.  A Google 
>> search for "Integrating Sampling Detector" reveals only one hit, the 
>> Pheonix wiki page.  It seems that a number of people here on the list 
>> are convinced that it is better than a QSD or commutating mixer.  It 
>> appears that Ahti isn't completely happy with his experimental 
>> results.   Phil has some simulation results on his blog page, but 
>> examining the simulation requires Windows and I'm a Linux guy.  
>> Gerald has a description of the QSD in his first article:
>> http://www.flex-radio.com/articles_files/SDRFMP1.pdf
>>
>> Referring to Figures 10 and 11 of that article.  Are we replacing the 
>> leaky integrators (RC low pass filter )with an ideal integrator and 
>> varying the time it is connected?   I'd like to see a block diagram.  
>> Ahti's circuit sure looks a lot like the block diagram and simple 
>> circuit described in Gerald's article (Figure's 10 and 11) to me.  So 
>> what exactly are the differences between a QSD and an ISD?
>>
>> What are the theoretical advantages/disadvantages of an ISD over a 
>> commutating mixer, or a QSD?
>> Maybe if I understood all the above, I could make some progress on 
>> understanding why Ahti's circuit isn't as good as expected, which is 
>> needed to advance the Pheonix project, and I'm interested in that.  :-)
>>
>> 73 and thanks for bearing with me,
>>
>> Rob, KL7NA
>>
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>
> LTSpice can be installed under Wine and runs fine, that way you can 
> try the circuits out, and experiment with changes.
>
>

-- 
Rob Frohne, Ph.D., P.E.
E.F. Cross School of Engineering
Walla Walla College
100 SW 4th Street
College Place, WA 99324
(509) 527-2075			 http://www.wwc.edu/~frohro

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