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OITPC - Output inclusive TPC (not TMC)
OITPC - Output inclusive TPC (not TMC)
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Old 17th September 2018, 03:31 PM   #81
dadod is offline dadod  Croatia
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Originally Posted by bimo View Post
This is the loop gain of my amplifier.
It looks very good, with good PM and GM.
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Old 18th September 2018, 02:16 AM   #82
bimo is offline bimo  Indonesia
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Originally Posted by dadod View Post
It looks very good, with good PM and GM.
Yes, it is. It proved this compensation is stable.

But, I have some problem if I use BJT output. The value of R29 become too high for loop gain look like as mosfet output.

Btw, the high frequency of my amplifier is very good. I think it is better than my Blameless amplifier with TMC compensation which used better components quality. But it is still in mono, so I wait until my friend build other one.
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Old 18th September 2018, 03:02 AM   #83
Krisfr is offline Krisfr  United States
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Bimo this looks very good. If I missed it please forgive, but I don't see any place where the values of the components is listed or stated. Thanks
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Old 18th September 2018, 03:30 AM   #84
bimo is offline bimo  Indonesia
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Bimo this looks very good. If I missed it please forgive, but I don't see any place where the values of the components is listed or stated. Thanks
Because, it is new kind of compensation, I have no confident to share the design. The first prototype have many problem, and some value of components different than the simulation.

Example: The forward voltage of RED LED is different than the model of sim. Un-matching components is too high, I modify the value of DC Servo components to get DC Offset below 1mV. But the compensations never changed.

It is better, you try Dadod's design.
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Old Today, 11:46 AM   #85
bimo is offline bimo  Indonesia
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I sim symmetry topology using OITPC compensation. This is the loop gain. Are PM dan GM enough?
Attached Images
File Type: png simetri.png (170.9 KB, 41 views)
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Old Today, 12:21 PM   #86
bimo is offline bimo  Indonesia
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Originally Posted by bimo View Post
I sim symmetry topology using OITPC compensation. This is the loop gain. Are PM dan GM enough?
Using Miller compensation and lead compensation (Input Inclusive aka Douglas Self):

PM 71 GM 18
THD: 32W/8Ohm, 20kHz -> 0.001720%
THD: 8W/8Ohm, 20kHz -> 0.001887%
THD: 1W/8Ohm, 20kHz -> 0.003326%
SR 40

Using OITPC:
PM 71 GM 14
THD: 32W/8Ohm, 20kHz -> 0.002150%
THD: 8W/8Ohm, 20kHz -> 0.000783%
THD: 1W/8Ohm, 20kHz -> 0.000340%
SR 54
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Old Today, 01:44 PM   #87
dadod is offline dadod  Croatia
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Quote:
Originally Posted by bimo View Post
I sim symmetry topology using OITPC compensation. This is the loop gain. Are PM dan GM enough?
Yes.
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