Waldhauer and frequency doublets

Dave Zan

Member
2010-11-21 7:12 am
Self makes a reference to frequency doublets in his power amp book.
The foundation paper on the subject seems to have been by Waldhauer in an IEEE convention back in 1963.
Bob Cordell compliments his work when they were both at Bell Labs, so I would like to read this.
But it's so far back that even the IEEE only has a summary, does anyone have a copy?
IEEE Xplore Abstract - Analog integrated circuits of large bandwidth

David
 
Waldhauer

I am an IEEE member (and full-time analog IC designer) and have access to the complete IEEE library. The link dimitri posted is for a pdf of a one paragraph summary of Waldhauer's presentation from 1963, it doesn't actually contain the content. Here's the paragraph:

"The use of integrated circuit packages in feedback amplifiers permits substantial reduction of parasitic elements and shortens the propagation time around the loop. Such an amplifier can be designed for accurate time domain performance under closed-loop conditions. An example is an amplifier with accurately controlled unit slope passing through unity loop gain at a frequency above 150 Mc. The open-loop amplifier or integrator may be used as a fundamental building block with various linear and nonlinear feedback elements to synthesize desired circuit functions."

I don't know anyone who actually has the direct presentation material. However, a more modern paper (perhaps containing some overlapping content) is available here ("Anti-causal analysis", Waldhauer's unique view of analyzing feedback amplifiers and probably what Bob Cordell was most referring too, but I'm speculating):
https://archive.org/details/bstj56-8-1337

Also, Waldhauer wrote a book about amplifier design with the simple title: "Feedback" from 1982 and it's basically an expanded version of the paper from the link above. I own the book, haven't read it in detail, maybe it would be useful but would require some serious time / background. Nowhere near as accessible as Self's books.

Here's a link:
https://www.amazon.com/Feedback-Fred-F-Waldhauer/dp/0471053198

Also, I consider this the classic reference on pole-zero doublets to be this paper (see also the classic Analog Design book by Gray/Meyer):

http://www.ece.iisc.ernet.in/~banerjee/course_E3238/Upload_files/kamath_pole_zero.pdf

Here is a link to another forum discussing design techniques using doublets (or dealing with them, since they are known for causing settling time issues in fast amplifiers):
The Designer's Guide Community Forum - Stability Vs pole-zero doublet
 

Dave Zan

Member
2010-11-21 7:12 am
..I don't know anyone who actually has the direct presentation material. However, a more modern paper (perhaps containing some overlapping content) is available here...
Also, Waldhauer wrote a book...

I consider this the classic reference on pole-zero doublets to be this paper
http://www.ece.iisc.ernet.in/~banerjee/course_E3238/Upload_files/kamath_pole_zero.pdf

Here is a link to another forum...

Thank you very much for an unusually comprehensive reply.
My local university library has the Waldhauer book and I read it rather quickly when I first wanted to broaden my education after I started on Self.
I probably should reread it more carefully, if I have any questions I will know with whom to discuss them ;).
The other Waldhauer link is new to me and I will read it immediately, it's always instructional to see the evolution of author's take on a subject. Hence my question in the first place.
The Kamath paper is one I had also found, and found it useful, nice to have that confirmed.
The forum discussion I will read now, see if what I have worked out for myself is also the result others have arrived at.

Best wishes
David
 
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Hi David,
My detailed response doesn't imply any especially deep understanding of the topic, just an immense interest. Essentially, I think I will be a life-long student of analog/feedback techniques (and audio!) and happy to discuss any time.

Good luck and fee free to PM me if something comes up.

-Chris

P.S. Two other resources I've found helpful:

Bode's original book:
https://archive.org/details/NetworkAnalysisFeedbackAmplifierDesign

Cherry and Hooper:
https://archive.org/details/CherryHooperAmplifyingDevicesAndLowPassAmplifierDesign1968RR
 

Dave Zan

Member
2010-11-21 7:12 am

Hi Chris

The Cherry book I read in the library to improve my expertise after I read Self and Cordell. So thanks for that, it's nice to have a PDF.

The Bode is one I already have in PDF. It's pretty much my scripture.
But I am thankful you nominated it, I have recommended it so many times that I hesitate to continue, lest people think I am a fanatic.

So it seems we have a similar appreciation of the literature.
Recently I have found Huisjing useful, if you haven't already seen it try here >. https://archive.org/details/Operational_Amplifiers

Best wishes
David
 
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