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Paper -
Conclusion
Paper -
So post #7 (below snippet) is not sufficient (which for most of us we learned the below inaccurate criteria in school),
eg that we now know Barkhausen is not complete, not sufficient design criteria.
Knight
Attached, page 15. Prior post uploaded, did not display in saved post. Huh....
https://web.archive.org/web/20160304040330/http://www.qucosa.de/fileadmin/data/qucosa/documents/3913/ProceedingsNDES2010.pdf
And then we have this, another attempt at attach. Analog "true" (whatever that means)...
A good starting point on FM, google "basic fm modulation pdf"
Speech is a very broad topic. But here is a simple way of getting to speech
one can adapt w/o having to reinvent decades of work :
https://www.edaboard.com/threads/gui-codeless-processor-design.397358/#post-1708529
Regards, Dana.
Barkhausen, last time on the homework, page 15 on....attached
And I repeat :
Your answer is ?
As pointed out earlier in references Tunnel Diode oscillator comes to mind.
Knight
1715855435
@OP, if you choose a digital approach you need to be concerned with wave table size
versus harmonic...
Examples here : https://en.wikipedia.org/wiki/Barkhausen_stability_criterion # 5 foot note
Your right, so much emotion in that earlier post (see the following) :
While you are at it can you tell me what a "true" VCO is, never learned that....., what
differentiates it from a non true VCO ...
Huh, and I thought that if I apply a V to a pin and get a changing freq sine with stable
amplitude out on another pin it was a "true" VCO. So now I have to call it a "false" VCO
solution......
So Vin = Freq out, and if I dont tell you whats in between then can it be a "true" VCO ?
Could have...
Single chip design, many other resources available onchip if you need them,
see right hand window for resources used/left.
If you need stuff like phase modulation use 24 Bit DDS which has that capability. You can also do stuff
like this also all onchip ...
What is freq range desired, and Vcontrol for that range, what V range is that.
Any concern about latency from a step change in Vcontrol to freq out ?
Distortion ? Harmonic distortion needed ? Any special T and V requirements ?
Accuracy of Fout = K x Vin ?
Analog Devices make some pretty good...
Do a google image search of just the package top see what you get.
https://www.howtogeek.com/352687/how-to-reverse-picture-search-with-google-images/
Regards, Dana.
https://www.analog.com/media/en/training-seminars/tutorials/MT-088.pdf
I would agree output side in general, but actual application considerations should be
looked at, distortion, noise, chg injection effects....
Regards, Dana.
As a prior production EE and later a test EE and FAE we characterized parts to set datasheet
limits and then cranked in, typically, not always, additional margin in test programs.
But ultimate authority of "what if" belongs in designer lap. That being said due to
poor simulators and incomplete...
I used your 3.5 Mhz as pulse period. Which is fundamental sine, then there
are 3 x 5 x 7 x......harmonics in it....
I used your 100 nS as Tr and Tf.
Regards, Dana.
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