Some useful articles on Right-Half Plane Zero

In doing some additional research on Bode plots, phase lead/lag, etc. I found the following articles and thought they were good enough to share for anyone else who is interested.

http://cbasso.pagesperso-orange.fr/Downloads/Papers/RHPZ,%20a%20two%20way%20control%20path.pdf

http://www.accessengineeringlibrary.com/mghpdf/0071776311_ar058.pdf

http://www.innovatia.com/Design_Center/Frequency_Response.htm

Problem 8.3a

For 8.3a, is the low frequency asymptote just zero or is a constant times s? I am scratching my head on this one. The gain goes to zero as the frequency goes to zero so I can argue that zero is the asymptote (the value at zero) but the gain does not flatten out as is approaches zero. There is an asymptote at +20 dB/decade which is jsut a constant times s.

What are others thinking?

Problem 6.6

For problem 6.6 do you need an input port equation, or just equations for v1 and vd3?

efficiency calculations

In some examples efficiency is calculated by

Pout / Pin

and in other places it has been calculated as

Pout / (Pout + Ploss)

How do we know which one we should use?

sample midterms

What is the password for the sample midterms?

HW 6 6.6 CCM

Is it safe to assume we are solving the problem in CCM or do we need to do a more general case?

HW 6 Problem 6.8

Was anyone able to figure out how to solve this without knowing Vg? It seems that everything (primary winding voltage, zener voltage, output voltage, etc.) need to be referenced to the input voltage.

HW #5 PFM Problem

Can someone shed some light on how they went about solving this problem? I have been staring at this for a while now and am stuck after doing the normal equations that were taught during the lectures. Any pointers would be greatly appreciated. Thanks.

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