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Old 8th August 2012, 01:47 PM   #31
dadod is offline dadod  Croatia
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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
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Old 8th August 2012, 01:48 PM   #32
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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
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Old 8th August 2012, 01:58 PM   #33
dadod is offline dadod  Croatia
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Quote:
Originally Posted by Dave Zan View Post
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.
Thanks for your comment.
dado
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Old 8th August 2012, 02:15 PM   #34
dadod is offline dadod  Croatia
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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.
dado
Attached Files
File Type: pdf DADO-TT-370w-VAScascad-lowpower.pdf (75.4 KB, 113 views)
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Old 8th August 2012, 02:19 PM   #35
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what is a C multiplier?
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Old 8th August 2012, 02:35 PM   #36
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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
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Old 8th August 2012, 02:40 PM   #37
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Quote:
Originally Posted by liching1952 View Post
what is a C multiplier?
Capacitance multiplier - Transistor connected to a capacitor to "multiply" the effective capacitance.

Best wishes
David
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Old 8th August 2012, 02:47 PM   #38
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Quote:
Originally Posted by Dave Zan View Post
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.
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Old 8th August 2012, 02:54 PM   #39
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and why not just use a bigger C instead of a C multiplier?
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Old 8th August 2012, 03:52 PM   #40
dadod is offline dadod  Croatia
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Quote:
Originally Posted by liching1952 View Post
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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