Wednesday, February 8, 2012

HW 2 Prob 19.3b - sketch bode?

I'm a bit confused on the wording of the problem. 19.3b: "Sketch a Bode diagram of the parallel LC parallel tank resonant."

Isn't this the same as H(s)?

But H(s) = (sL||1/sC||Re)/(sL||1/sC||Re) = 1 given that Zo(s)=Zin(s).

If that's the case, what's the point of plotting H(s)? Or is the problem asking to plot the bode for sL||1/sC? Thanks.

2 comments:

Keith said...

Hi Khoa,
You are right that H(s) = 1 for this resonant tank. However, H(s) is not the same as the tank impedance. The problem is asking to plot the parallel combination of L and C. See the textbook for algebra-on-the-graph technique.

Khoa said...

Thank you. That was helpful.