Circuit as the picture shows,with the independent current source generate current 2V1.
Need to find the admittance matrix Y.
{I1=Y11*V1+Y12*V2
I2=Y21*V1+Y22*V2

 

Circuit as the picture shows,with the independent current source generate current 2V1.
Need to find the admittance matrix Y.
{I1=Y11*V1+Y12*V2
I2=Y21*V1+Y22*V2

You need to read the sticky for this forum: http://forum.allaboutcircuits.com/t...ng-questions-in-the-homework-help-forum.3002/

You must first show your own attempt to solve the problem, then somebody will help you.

MOD NOTE: Link to forum sticky corrected.

 

In a) case,set V1=0,
I2=-I1,V2=5*I2 ====>Y12=-1/5 and Y22=1/5
But in case b) V2=0,
I dont know if the indepen current generator still effect to the circuit,or it just be opened.
Please anyone help.

 

Circuit as the picture shows,with the independent current source generate current 2V1.

How do you figure that it is an independent current source? It seems like the current is dependent of V1, does it not?

 

In a) case,set V1=0,
I2=-I1,V2=5*I2 ====>Y12=-1/5 and Y22=1/5
But in case b) V2=0,
I dont know if the indepen current generator still effect to the circuit,or it just be opened.
Please anyone help.

It is NOT an independent current generator. You should have been through analyzing circuits that have dependent sources LONG before you got to two-port networks.

You simply have a circuit that has a voltage-controlled dependent current source. So set up the mesh and/or node equations that govern it.

 

It is NOT an independent current generator. You should have been through analyzing circuits that have dependent sources LONG before you got to two-port networks.

You simply have a circuit that has a voltage-controlled dependent current source. So set up the mesh and/or node equations that govern it.

My fault,its a voltage-controlled dependent current source.
But what I meas is I don't know if the 2V1 source provides the current to the node or it's opened.

Let me clear my question:

I1+I2=0
or
I1+I2+2V1=0
?

 

You have three currents coming into the top node.

Your first equation requires that the current coming out of the dependent current source be zero.

If that is the case, what does that require that V1 be?

If V1 is not zero, then (2 A/V)·V1 is not zero, right? If that's the case, then how can your first equation be valid?

 

You have three currents coming into the top node.

Your first equation requires that the current coming out of the dependent current source be zero.

If that is the case, what does that require that V1 be?

If V1 is not zero, then (2 A/V)·V1 is not zero, right? If that's the case, then how can your first equation be valid?

Thanks,I got it.
I confused with the wire rightside.