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Old 16th December 2010, 03:10 PM   #1001
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Hi JPV

Quote:
If you google J.K. Roberge you will come to a place where you can download parts of the book. If you cannot find the book, you can download what is already provided on Roberge/MIT site. I can try to scan the missing chapters and send it to you. There should be no copyright problems because it seems that the book is public domain now.

JPV
Well, maybe my Google-power is weak today but I didn't find anything. Can you give me a link? Would be very grateful if you can send scans. If you need my email address it is on the home page of my website at:

douglas-self.com
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Old 16th December 2010, 03:19 PM   #1002
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Quote:
Originally Posted by DouglasSelf View Post
Hi JPV
Well, maybe my Google-power is weak today but I didn't find anything. Can you give me a link? Would be very grateful if you can send scans. If you need my email address it is on the home page of my website at:

douglas-self.com
Have a look here;

OP2E

Haven't tried to download it myself, so can't comment on status of the link on the page.

Sandy
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Old 16th December 2010, 03:55 PM   #1003
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Originally Posted by mnemneth View Post
Have a look here;
OP2E
Sandy
That works nicely, thank you very much indeed.

For those downloading, be aware that only Chapter 1 and Chapter 13 of the Roberge book are in the PDF. But Ch 13 is all about compensation; I have just skimmed it and it looks like excellent stuff, going deeper than most texts I have seen.

Thanks again
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Old 16th December 2010, 04:33 PM   #1004
JPV is offline JPV  Belgium
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Quote:
Originally Posted by DouglasSelf View Post
That works nicely, thank you very much indeed.

For those downloading, be aware that only Chapter 1 and Chapter 13 of the Roberge book are in the PDF. But Ch 13 is all about compensation; I have just skimmed it and it looks like excellent stuff, going deeper than most texts I have seen.

Thanks again
I sent you an email.

This book is the best I have read. Chapter four is about compensation and chapter 13 is compensation revisited.
There is a chapter called an illustrative design that goes through a full discrete ( bjt/fet) opamp design with in depth compensation analysis, a gem.

At the same level but very recent, broader and more advanced, the book of W.Sansen 'Analog design essential' is unmatched.

JPV
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Old 16th December 2010, 06:28 PM   #1005
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Originally Posted by Bob Cordell View Post
Hi Doug,

I agree. The output stage is the main nemesis and is usually the most expensive one to improve (in terms of dollars, heat and size). Making an IPS-VAS that is superb is much less expensive by comparison. That is why I'm inclined to favor TMC over TPC. However, implicit in my leaning is the sense that TMC does more to improve the output stage than TPC for equal margin in the amplifier against any sort of instability. Whether my sense of that is correct in light of a rigorous exploration is unclear.

Cheers,
Bob
Actually TMC gives almost exactly the same net loop gain about the output stage as the equivalent TPC while delivering a single-pole loop gain response for the input stage. This makes TMC pointless relative to TPC.
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Old 16th December 2010, 06:54 PM   #1006
wahab is offline wahab  Algeria
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Originally Posted by michaelkiwanuka View Post
Actually TMC gives almost exactly the same net loop gain about the output stage as the equivalent TPC while delivering a single-pole loop gain response for the input stage. This makes TMC pointless relative to TPC.
Not at all...
Things are a little more subtile..
Actually, TMC has intrinsically more total available NFB than TPC....

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Old 16th December 2010, 07:07 PM   #1007
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Quote:
Originally Posted by michaelkiwanuka View Post
Actually TMC gives almost exactly the same net loop gain about the output stage as the equivalent TPC while delivering a single-pole loop gain response for the input stage. This makes TMC pointless relative to TPC.
Hi Mike,

Where is Edmond when we need him to defend TMC? :-)

Anyway, it probably depends on your definition of what consitutes TMC that is equivalent to TPC. Maybe you can tell us and also show some simulation that supports your assertion. My inclination is that it is wrong to say that TMC is pointless relative to TPC.

Cheers,
Bob
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Old 16th December 2010, 07:18 PM   #1008
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Originally Posted by wahab View Post
Not at all...
Things are a little more subtile..
Actually, TMC has intrinsically more total available NFB than TPC....

Bob Cordell's Power amplifier book

Wrong.
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Old 16th December 2010, 07:29 PM   #1009
wahab is offline wahab  Algeria
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Originally Posted by michaelkiwanuka View Post
Wrong.
I did provide a valuable explanation to back my sayings.

One more time, the VAS has inherently more gain in a
TMC configuration than in an equivalent TPC one,
due to heavier VAS loading of the latter..

You don t agree with that?...Surprising...
Seems that you didn t catch the curves meaning..

Edit : I repost the sims.

The red curve is the OLG of an uncompensated amp.
Green is OLG of the amp with influence of TMC vas loading.
Blue is the same amp OLG with influence of TPC VAS loading..

These curves talk by themselves, so please, no more "wrong"
as you re only making fool of yourself with such unsubstancied claims...
Attached Files
File Type: zip OL GAIN VS VAS LOADING COMP.zip (6.8 KB, 60 views)

Last edited by wahab; 16th December 2010 at 07:42 PM.
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Old 16th December 2010, 07:38 PM   #1010
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Default wrong?

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Originally Posted by Bob Cordell View Post
Hi Mike,

Where is Edmond when we need him to defend TMC? :-)
[snip]

Cheers,
Bob
Hi Bob,

Why should I respond to someones mono syllabic barking anyhow?
Besides, that person is on my ignore list.

Cheers,
Edmond.
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