What Im maintaining is that those caps could be formed by the use of mosfets depending on the process used by the manufacturer.
The CC cap is for frequency compensation the other entails a clever distortion cancellation.
No I wont get specific, I have already told you that my expertise is not about IC fabrication processes and that I have no interest as such.
Your questions now however is about circuit design and not on fabrication processes, so you want to change the subject now.
The CC cap is for frequency compensation the other entails a clever distortion cancellation.
No I wont get specific, I have already told you that my expertise is not about IC fabrication processes and that I have no interest as such.
Your questions now however is about circuit design and not on fabrication processes, so you want to change the subject now.
Congratulations, you now just learned what my 10 year old daughter knows. Look some more.
Congratulations, you now just learned what my 10 year old daughter knows. Look some more.
Let's keep things to technical discussion. If you're unable to make a technical argument, that's fine, but personal attacks are not allowed on this forum.
compensation/decompensation (pin 8) with ad797 is not relevant to this conversation. usually, as with the 797 such choices are made to enable the person applying the chip to ADJUST the value to suit the feedback network/gain bandwidth/load, which kinda requires it be external. also perhaps back in 2006 (or was it before?) they did not have quite as good processes for caps.
so funny, changing from making a solid, but false statement designed to sound like you knew what you were talking about, to throwing childish insults around in place of actual examples, to back-pedalling about what you said, more childish insults, persistent lack of meaningful content, more childish insults and erm..chest beating (perhaps an appendage) in place of information, more backpedalling
funny
so funny, changing from making a solid, but false statement designed to sound like you knew what you were talking about, to throwing childish insults around in place of actual examples, to back-pedalling about what you said, more childish insults, persistent lack of meaningful content, more childish insults and erm..chest beating (perhaps an appendage) in place of information, more backpedalling
funny
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This is not a personal attack, my 10 year old daughter has a keen interest in electronics and and mechanics, so Ive indulged her curiosity since the age of 6. She spends hours around my books during weekdays. She can explain to you how a 741 operates and she knows that 90 % of all op amp ICs are internally compensated.
The poster claims he designed IC opamps but doesnt know something so basic such as this, shouldnt be continuously arguing a fact he clearly knows very little about it seems. One only needs to know how to read, get a couple of datasheet to find such information never mind spending 4 years buried in books at a higher education institution.
haha, lovely story, nice to see that a basic lack of reading comprehension qualifies you for something...
all we've seen from you is personal gripes and allusions to old second hand knowledge and you keep on harping on, digging the thread up after a few days to carry it on. throwing in an anecdote/sideways insult about how youve educated your daughter to be more knowledgeable than others, yet have not demonstrated any such real knowledge yourself.
all we've seen from you is personal gripes and allusions to old second hand knowledge and you keep on harping on, digging the thread up after a few days to carry it on. throwing in an anecdote/sideways insult about how youve educated your daughter to be more knowledgeable than others, yet have not demonstrated any such real knowledge yourself.
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Actually this is really funny, finally it is said, "the processes for the caps arent quite as good". Now we back on topic.
Clearly no false statement and I do know what Im talking about. I dont need to google these things like some. There are no plate capacitors inside IC opamps., Except for thin films, caps are formed through the working of active parts such as mosfets and Jfets and Bjts. These parts are not quite as high performing as plate capacitors.
The only chest beating I do, I do just before I jump in bed in the evenings with my loving wife.
Great. I posted a link to a specific schematic for a commonly used audio IC opamp. Please point out what the "hiccups" are for the capacitors shown, whether or not they're made from "reverse biased MOSFETs," and your predicted circuit consequences of those "hiccups." We can compare your predictions of performance to the measured data (that's how we do things in the technical world) and ask the designer of that chip to check your work.
There is much more to life than sitting glued 24 hours a day to a PC like a geeks, forum junkies and druggies. Do you honestly think I stay here glued to my seat just waiting for some post than immediatly start answering it. Get a life man.
Do you twist everything you read, I explicit said that fabrication processes is not my expertise but this is what I do know about them. Can you understand this sentence or do I have to say it in a way I do with my 2 year old son.
If I had to take a 10 year olds´abillity being beyond my own sometimes as an insult than I would already have thrown my daughter years ago out of the house. Some people are born gifted but probably you ve never heard of that either.
guys, can we keep the discussions on a purely technical level please? i can close this thread if the personal attacks continue...Sorry, I dont have the time to spend hours doing monte carlo analysis of the this circuit to which would be required to answer your question thoroughly of how capacitor performance will affect it. I am assuming you all know what monte carlo analysis is. I have my own work to do, unfortuneatly Im not retired on welfare or have millionare parents.
From a simple spice simulation you could easily observe the effects on phase margin and stability and distortion. For that youd need the full schematics and not just the simplified version on the datasheet.
I never claimed mosfets are used in the AD797 so please dont insinuate that I did.
You have a great idea though, please ask Scot Wurcer exactly how the cap is formed inside this IC or do you want me to ask him.
It will have to wait for monday though as Im off to spend the weekend in the mountains with my family.
Manso is just defensive. He has a pet theory about ICs and the performance of the capacitors that are sometimes fabricated on them. His theory runs deep: from this theory (where that it were true), the supposed inferior "sound of Op Amps" becomes readily explained. Explaining a fiction with a deeper fiction. Its a good theory too, for doing that. Yet... it needs teeth.
GoatGuy
GoatGuy
The "numbers" from the 3 tests in LA4 were derived in almost the same manner as those WJ wrote up in 1995 -- and as we now know they don't relate well to the subjective experience. I applied the Didymus test! (This is how Reinhart-Rogoff got debunked if you're up on your recent economics). But just because the correlation coefficients aren't high doesn't mean that Walt's design isn't the best sounding.
It's been pointed out to me (via Jan) that there may be another test which would relate to the ordinal scores. I did some simulation and it looks promising indeed!
In the interim, here's a description of the DUT:
An externally hosted image should be here but it was not working when we last tested it.
are the lumped elements critical for performance? (the capacitor ESR) or just a means of making the model more accurate for the parts on hand? I say this because most of my 100uf caps are lower ESR than that; they are not all ultralow ESR (though most are) but I doubt i've got anything much higher than ~100mΩ. I realize too low can be a no-no for wide bandwidth regs and wasnt usually recommended for the superregs
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Changing the ESR has a significant effect. I would like to get to bench results before bloviating -- and don't want to speak without any actual data -- but I have to go to attend family biz 400 miles away for a week.
That conclusion that I emphasised here is like the “90% break point” conclusion in Reinhart-Rogoff study.
Funny, arrow of direction in casuality is the main issue of the analysis here as is with R-R debanked analysis. (I hope the analogy breaks when it comes to their questionable and selective data handling
)George
Should have said it "has" an effect, but it's not that significant. My bad. I Rogoffed the data.
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