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 8th August 2012, 01:47 PM #31 diyAudio Member     Join Date: Apr 2006 Location: Zagreb Those are correct data: ULGF = 1MHz RL = 4ohm, Pout=330W THD1k = 7ppb THD20k = 1.33ppm (1.08ppm, RL = 8ohm) THD50k = 15.72ppm THD100k =0.009624% THD200k =0.061653% RL = 4k, THD20k = 0.77ppm PM = 92 degree GM = 15dB
 8th August 2012, 01:48 PM #32 diyAudio Member   Join Date: Nov 2010 Hi Dado Nice work. I am a bit surprised by the loop gain plot. After heated debate in earlier threads I think that finally there was consensus that TMC is a second order system and that the similarity to (1st order) Miller comp in the outer loop is deceptive. The loop gain plot that sets the stability limit should show second order behaviour and I don't see that. Is there some explanation? Best wishes David
diyAudio Member

Join Date: Apr 2006
Location: Zagreb
Quote:
 Originally Posted by Dave Zan Hi Dado Nice work. I am a bit surprised by the loop gain plot. After heated debate in earlier threads I think that finally there was consensus that TMC is a second order system and that the similarity to (1st order) Miller comp in the outer loop is deceptive. The loop gain plot that sets the stability limit should show second order behaviour and I don't see that. Is there some explanation? Best wishes David
It is similar to Miller comp if TMC resistor was connected outside(directly to output) the probe. Here is screen shot with the resistor inside the probe.
Attached Images

diyAudio Member

Join Date: Apr 2006
Location: Zagreb
Here is low power version.

ULGF = 1MHz
RL = 8ohm, Pout=95W
THD1k = 1.09ppm
THD20k = 1.74ppm
THD50k = 16.15ppm
THD100k =0.014506%
THD200k =0.114467%
RL = 4k, THD20k = 0.77ppm
PM = 90 degree
GM = 15dB

It is quite simple, specialy if capacitance multipliers for OPS were removed and powered with +-45 V instead.
Attached Files

 8th August 2012, 02:19 PM #35 Banned   Join Date: Aug 2012 what is a C multiplier?
 8th August 2012, 02:35 PM #36 diyAudio Member   Join Date: Nov 2010 Thank you - that plot is much more informative. The outer loop plot always looks like Miller compensation so it is deceptive without an explanation. Best wishes David
diyAudio Member

Join Date: Nov 2010
Quote:
 Originally Posted by liching1952 what is a C multiplier?
Capacitance multiplier - Transistor connected to a capacitor to "multiply" the effective capacitance.

Best wishes
David

Banned

Join Date: Aug 2012
Quote:
 Originally Posted by Dave Zan Capacitance multiplier - Transistor connected to a capacitor to "multiply" the effective capacitance. Best wishes David
It what kind of application is that used? You get the the nonlinearity and limitations of the transistor for free as bonus.

 8th August 2012, 02:54 PM #39 Banned   Join Date: Aug 2012 and why not just use a bigger C instead of a C multiplier?
diyAudio Member

Join Date: Apr 2006
Location: Zagreb
Quote:
 Originally Posted by liching1952 and why not just use a bigger C instead of a C multiplier?
You can search this forum, it was written quite a lot about capacitance multiplier here.

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