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Old 26th April 2013, 01:52 AM   #1
jxdking is offline jxdking  China
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Default Super TMC

-12dB less THD@100KHz than normal TMC.

My question is, how many poles in there?
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Old 26th April 2013, 06:08 AM   #2
lineup is offline lineup  Sweden
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Great job!
I did not know we can get such much lower THD using several poles.
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Old 26th April 2013, 09:25 AM   #3
AndrewT is online now AndrewT  Scotland
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The slew rate looks like it is around 20V/s.
The phase margin is almost 90.
Could the 330pF be reduced slightly, to give some performance benefit?
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Old 26th April 2013, 09:28 AM   #4
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This is very unlikely to be stable.
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Old 26th April 2013, 12:22 PM   #5
jxdking is offline jxdking  China
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Quote:
Originally Posted by AndrewT View Post
The slew rate looks like it is around 20V/s.
The phase margin is almost 90.
Could the 330pF be reduced slightly, to give some performance benefit?
There is only 1/3 of the output voltage between each 330pF. The slew rate is about the same if you remove all the resistors around the capacitors. In my case, if you remove all the resistor, the equivalent miller cap is about 100pF.
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Old 26th April 2013, 12:37 PM   #6
jxdking is offline jxdking  China
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Originally Posted by michaelkiwanuka View Post
This is very unlikely to be stable.
I haven't investigated the stability yet.
I am afraid I am not able to do that with my crappy math.
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Old 26th April 2013, 03:13 PM   #7
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Use LTSpice and not Multisim to investigate loop gain.
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Old 26th April 2013, 07:34 PM   #8
jxdking is offline jxdking  China
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Quote:
Originally Posted by michaelkiwanuka View Post
Use LTSpice and not Multisim to investigate loop gain.
I will take some time to try LTSpice. Never tried LTSpice before.
I will appreciate that if some one simulate this extreme TMC version before I get the results.
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