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Michael Steffes

Measuring & Modeling Wideband Baluns for Application to ADC Input Stages

Michael Steffes
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Brad Albing
Brad Albing
3/24/2013 9:41:25 PM
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Re: Transformer history
Of course, these transformers are rather more sophisticated that the ones that George Westinghouse and Charles Steinmetz were working with. Somewhat wider bandwidth and more predictable response with regard to common- and differential-mode behavior.

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Bill_Jaffa
Bill_Jaffa
2/27/2013 6:24:28 PM
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Re: Transformer history
Sorry,I forgot to include the link to an interesting resource on their history:

http://edisontechcenter.org/Transformers.html

and there are many more you can find.

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Bill_Jaffa
Bill_Jaffa
2/27/2013 6:16:49 PM
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Transformer history
Interesting that the transformer--among the oldest electrical components--still finds so may roles. The induction principle was discovered in the 1830s, and the first commnercial transformers were used in the 1880s--but they were for power, not signal.

A properly designed and used transformer can be an extremely reliable device and a solution to a lot of problems in signal isolation, baluns (as this blog shows), power transfer, voltage/current step-up/down, impedance matching, and many others. Not bad for a "dumb", passive part!

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More Blogs from Michael Steffes
Modern Rail-to-rail (R-R) output stage op amps, or fully differential amplifiers (FDAs), can sometimes get into a low phase margin condition for relatively simple circuits. Using the phase margin simulation test of Reference 1, a few simple external phase margin improvement methods will be shown. These tests and fixes are best done in simulation prior to board layout. Where the device model for a R-R output device is perhaps not including the higher frequency reactance, places for these tuning elements might be put into the board layout as a hedge against future stability problems.
Modern high-speed op amps and Fully Differential Amplifiers (FDAs) push the limits in every direction to deliver the best harmonic distortion at the lowest quiescent power. This often leads to relatively low phase margin designs in what would normally appear to be benign application circuits.
The differential outputs provided by fully differential amplifiers (FDA) can be used in a positive feedback scheme to generate a partially active output impedance
A recent >30MHz active filter design will be described here and updated to more accurately fit the desired response shape.
Include the op amp gain bandwidth product in the Rauch low-pass active filter performance equations
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