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Homework Statement
Find the transfer function, [itex]G(s) = \frac{V_{0}(s)}{V_{i}(s)}[/itex] for each network shown in figure P2.3. [Section 2.4]
http://imagizer.imageshack.us/v2/800x600q90/20/1ocq.png
Homework Equations
The Attempt at a Solution
When I try and solve this problem I Kirchhoff's Current Law and get
[itex]\frac{V_{O}(t) - V_{i}(t)}{R} + \frac{1}{L}∫_{0}^{t}V_{0}(\tau)d\tau + \frac{V_{0}(t)}{R} = 0[/itex]
This doesn't really seem to help.
The solutions manual writes the node equation as
[itex]\frac{V_{0} - V_{i}}{s} + \frac{V_{0}}{s} + V_{0} = 0[/itex]
and then solves this for
[itex]\frac{V_{0}}{V_{i}} = \frac{1}{s + 2}[/itex]
I don't exactly see how they get the node equation they do. I know that the impedance of a resistor is just the resistance and that the impedance of the inductor is Ls. So to me it looks like it should be
[itex]\frac{V_{0} - V_{i}}{R} + \frac{V_{0}}{Ls} + \frac{V_{0}}{R} = 0[/itex]
[itex]\frac{V_{0} - V_{i}}{1} + \frac{V_{0}}{1s} + \frac{V_{0}}{1} = 0[/itex]
[itex]V_{0} - V_{i} + \frac{V_{0}}{s} + V_{0} = 0[/itex]
I don't see were the [itex]\frac{V_{0} - V_{i}}{s}[/itex] term comes from.
Thanks for any help.
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