# Derivation of state equations and calculations of transfer impedance.

#### lemon

Joined Jan 28, 2010
125
Hi:
I have this question to complete but don't know what is meant by State Equations. Also it asks for Driving Point. What is that?

Question: In the circuit in Figure Q5-1 write the state equations. Obtain from the state equations the transfer
impedance relating V3 to is and the driving point impedance at the source terminals.

Thank you. Any guidance appreciated.

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#### Vahe

Joined Mar 3, 2011
75

In the circuit that you show, there will be three state equations one for each of the capacitor voltages. You derive the state equation by writing a KCL equation at the top node of each capacitor noting that the capacitor current is C dv/dt where the current is directed in the direction of capacitor voltage drop.

Driving point impedance is the impedance "seen" by the driving source. In this case, I think it refers to the impedance seen from the point of view of the current source.