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Old 25th July 2009, 09:13 AM   #1
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Default The most linear stage for large voltage swings - Lender's Circuit

The most linear stage for large voltage swings - Lender's Circuit

In my (already older) book from the magazine "Audio Amateur", title "Power Amp Projects" I have found the project from ERNO BORBELY "The 60W MOSFET POWER AMPLIFIER" On page 76 (column 2), I read - quotation -

================================================== ===============
The most linear stage for large voltage swings is the grounded base or common base amplifier. Unfortunately interfacing his stage with others is not easy because of biasing problems.
Lender (ref2) presents the most elegant solution to this problem. I have come across. His circuit has a differential input stage and a current mirror transfers the bal. output back to the single-ended output.
================================================== ================

so as an ref advice (ref 2) to very interest Motorola article from Mr. R. Lender
"Power Amplifier with darlingon output stage"
Motorola Inc., Geneva, Switzerland,
7.9.1974 internal report (July 9. or Sep. 7 - I don't know)

This article I want to have. No PDF file about this I find online (on the web).
Who knows, where I can download this original article from Motorola ?
Also of interest for me are books and additional articles of Mr. R. Lender

This voltage gain stage topology you can find in several designs, e. g.
http://www.davidsaudio.com/assets/im...pzilla_sch.jpg (ampzilla)
or JBL stage power amplifier 6290
http://www.jblpro.com/catalog/genera...CatID=20&Run=1
and many other
This topology is a transitional form between folded cascode version (one stage voltage gain amp) and normal version (two gain stage voltage amp). I think, in the orig. article there are to read more about the calculation basics because it was written for development departments

Thank you very much for your advices

P.S. Online about this I have found only the follow:
http://www.tubecad.com/march2001/page25.html (I think, Linder is faulty name and Lender the right one)
http://www.tubecad.com/2004/blog0001.htm
www.tubecad.com/march2001/2001_03.pdf (page 25)
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Old 25th July 2009, 09:26 AM   #2
AndrewT is offline AndrewT  Scotland
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there are 18 other "Lender" results in the search function.
Here is one example:
http://www.diyaudio.com/forums/showt...726#post410726
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Old 25th July 2009, 02:37 PM   #3
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Default Re: The most linear stage for large voltage swings - Lender's Circuit

Quote:
Originally posted by tiefbassuebertr
The most linear stage for large voltage swings - Lender's Circuit

In my (already older) book from the magazine "Audio Amateur", title "Power Amp Projects" I have found the project from ERNO BORBELY "The 60W MOSFET POWER AMPLIFIER" On page 76 (column 2), I read - quotation -

================================================== ===============
The most linear stage for large voltage swings is the grounded base or common base amplifier. Unfortunately interfacing his stage with others is not easy because of biasing problems.
Lender (ref2) presents the most elegant solution to this problem. I have come across. His circuit has a differential input stage and a current mirror transfers the bal. output back to the single-ended output.
================================================== ================

so as an ref advice (ref 2) to very interest Motorola article from Mr. R. Lender
"Power Amplifier with darlingon output stage"
Motorola Inc., Geneva, Switzerland,
7.9.1974 internal report (July 9. or Sep. 7 - I don't know)

This article I want to have. No PDF file about this I find online (on the web).
Who knows, where I can download this original article from Motorola ?
Also of interest for me are books and additional articles of Mr. R. Lender

This voltage gain stage topology you can find in several designs, e. g.
http://www.davidsaudio.com/assets/im...pzilla_sch.jpg (ampzilla)
or JBL stage power amplifier 6290
http://www.jblpro.com/catalog/genera...CatID=20&Run=1
and many other
This topology is a transitional form between folded cascode version (one stage voltage gain amp) and normal version (two gain stage voltage amp). I think, in the orig. article there are to read more about the calculation basics because it was written for development departments

Thank you very much for your advices

P.S. Online about this I have found only the follow:
http://www.tubecad.com/march2001/page25.html (I think, Linder is faulty name and Lender the right one)
http://www.tubecad.com/2004/blog0001.htm
www.tubecad.com/march2001/2001_03.pdf (page 25)

Have you asked Erno? He may have a copy and/or willing to scan.

jd
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Old 25th July 2009, 06:08 PM   #4
Bigun is offline Bigun  Canada
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This is indeed an approach with potential. I also came across the tube.cad article [http://www.diyaudio.com/forums/showt...44#post1847644] but I found it does suffer from producing imbalance in the LTP when not used as part of a symmetrical design such as Roender's folded cascode. You end up using a lot more parts than the simple Self single ended VAS.
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Old 25th July 2009, 08:27 PM   #5
KSTR is offline KSTR  Germany
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Pavel (PMA) is using it, too, in the DisPre II. Albeit unbuffered and complementary.
New DISPRE preamp, successor to previous popular version

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Old 25th July 2009, 09:43 PM   #6
Bigun is offline Bigun  Canada
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This looks a little different than common base, more like a differential with input into the base and into the emitter ?

http://www.tpub.com/content/neets/14...s/14180_92.htm
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Old 26th July 2009, 01:14 PM   #7
mlloyd1 is offline mlloyd1  United States
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just to throw it out there - there has been some discussion on "pseudo" folded cascode in a few places over the years. here's a couple of places i know about:
number 1 and number 2

warning: number 2 wandered off-topic quite a bit, as is usual around here.

mlloyd1
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Old 31st July 2009, 01:28 PM   #8
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Default Re: Re: The most linear stage for large voltage swings - Lender's Circuit

Thank you very much for the additional circuit advices with Lender's topology.

Quote:
Originally posted by janneman



Have you asked Erno? He may have a copy and/or willing to scan.

jd
yes, already some years ago. Unfortunately he don't have the orig article

"Power Amplifier with darlingon output stage"
Motorola Inc., Geneva, Switzerland, 7.9.1974.

Erno says. which this article is mainly concerned the application instructions of newly introduced darlingon technology. Lender's circuit was there one of some more topics.
This article only the old, former Motorola employees can look out. Since then the field of power devices transits in the company "ON SEMI", it can also be that this article now by ON-SEMI is archived. This article was only available for large customers and otherwise in those days for internal use only. in any one days by this forum come up this article - so I hope.
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Old 2nd August 2009, 01:47 AM   #9
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tiefbassuebertr,
Quote:
The most linear stage for large voltage swings is the grounded base or common base amplifier.
Right.
Quote:
Lender (ref2) presents the most elegant solution to this problem. I have come across.
It`s a mildly flattering solution resulting in something else.
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Old 2nd August 2009, 05:15 AM   #10
Bonsai is offline Bonsai  Taiwan
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for large voltage swings and great linearity, you might want to try Hawksfords VAS stage. I hav e not built it, but in sims its about 20 times better than a standard cascode on distortion.
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