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Old 25th September 2012, 03:24 AM   #7241
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Quote:
Originally Posted by Wavebourn View Post
Let's discuss now who first started using Ohm's law in audio amplifiers.
Wavebourn

Sorry despite the smiley I don't get it, please elaborate.

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-Antonio
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Old 25th September 2012, 11:35 AM   #7242
DF96 is offline DF96  England
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I think Wavebourn's point is that 'tail pole reduction' is just circuit theory.
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Old 25th September 2012, 02:18 PM   #7243
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I guess I'm starting to like the term tail pole.
At first this was discussed with regard to slew rate effects which I still dont see the significance for typical discrete audio amplifiers.
But as some are really pushing the overall bandwidth of these amps, this additional pole will start to reduce phase margin.

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-Antonio
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Old 25th September 2012, 05:53 PM   #7244
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Quote:
Originally Posted by DF96 View Post
I think Wavebourn's point is that 'tail pole reduction' is just circuit theory.
My point was, we did not give yet names and did not review yet who first used each of obvious solutions based on elementary laws of physics.
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Old 25th September 2012, 07:05 PM   #7245
DF96 is offline DF96  England
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Does anyone here use the quasi-static conservative field approximation method? Very useful for analysing circuits, and it is based on fundamental physics. Of course, I have been using it successfully for many years yet some of you have probably never even heard of it.
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Old 25th September 2012, 07:33 PM   #7246
bcarso is offline bcarso  United States
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Quote:
Originally Posted by magnoman View Post
I guess I'm starting to like the term tail pole.
At first this was discussed with regard to slew rate effects which I still dont see the significance for typical discrete audio amplifiers.
But as some are really pushing the overall bandwidth of these amps, this additional pole will start to reduce phase margin.

Thanks
-Antonio
Where you will see the effects as well from a less-than-ideal current source is in common-mode distortion, including effects due to loading the signal source.
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Old 25th September 2012, 07:58 PM   #7247
SY is offline SY  United States
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Quote:
Originally Posted by DF96 View Post
Does anyone here use the quasi-static conservative field approximation method? Very useful for analysing circuits, and it is based on fundamental physics. Of course, I have been using it successfully for many years yet some of you have probably never even heard of it.
I prefer using Hartree-Fock methods with configuration interaction terms; that way, we really know where the electrons distribute themselves. That's far beyond most amateurs but it's what I use to win listening contests.
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Old 25th September 2012, 08:47 PM   #7248
tvrgeek is offline tvrgeek  United States
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OK, I read through Solomon's paper. More of it makes sense than when I started. So I plugged in this extra resistor in my sample CCS SPICE models. In my 2mA circuits, I found a slight improvement in the source impedance, but I was expecting it to effect the consistency of the source over frequency, and it did not seem so. I saw no change in distortion. Model too simplistic? I did see that there seems to be a good range for this part, in my circuit, about 500 Ohms. Not enough to substantially reduce the drop across the CCS transistor(s) to allow lower voltage faster transistors like the 10K used in my Hafler. One part, many aspects.
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Old 25th September 2012, 08:53 PM   #7249
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Quote:
Originally Posted by DF96 View Post
Does anyone here use the quasi-static conservative field approximation method? Very useful for analysing circuits, and it is based on fundamental physics. Of course, I have been using it successfully for many years yet some of you have probably never even heard of it.
I never heard of it.
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Old 25th September 2012, 08:56 PM   #7250
tvrgeek is offline tvrgeek  United States
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Quote:
Originally Posted by Wavebourn View Post
My point was, we did not give yet names and did not review yet who first used each of obvious solutions based on elementary laws of physics.
Now, you are going against the entire basis for patent trolls! I am surprised some idiot has not filed for a patent for using Ohm's law. Either of them. Our stupid patent office would probably give them one.

Apple got a patent on "sleek design" for crying out loud!
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