Performing Coupling in resonators using (OrCad) PSPice

[MuhammadSana]

I am working on inductive coupling b/w resonators (RLC) ,using orcad lite 16.6 tool. At this time I am unable to perform it properly, Is any one there to suggest me how to couple the resonators via inductors? I am using "K_linear" under analog library ,as coupling coefficient. The circuit layout and model is attached:
>>>We have,out of total, 5 main couplings
>>>The cicuit layout shows this.
>>>Analog R L C are used
Hoping for a positive response.

 

[CataM]

At this time I am unable to perform it properly

You defined wrongly the K_LINEAR instance.

This is how I would write it for "K1" for example:
k=0.41
L1=L1l
L2=L2r1

Is any one there to suggest me how to couple the resonators via inductors? I am using "K_linear" under analog library ,as coupling coefficient

I use that as well and works great.

- - - Updated - - -

Review coupling of K2,K5 and K6.

 

[MuhammadSana]

You defined wrongly the K_LINEAR instance.

This is how I would write it for "K1" for example:
k=0.41
L1=L1l
L2=L2r1


I use that as well and works great.

- - - Updated - - -

Review coupling of K2,K5 and K6.

Thank you for the reply..........
But I further need guidance, how to change the remaining couplings?
I have done this L1=L1l L2=L2r1 with the K1, (attachment), but how to change remaining K2-K6 with such expressions? Also check the property window pane of the schematic.. Is that correct??

- - - Updated - - -

You defined wrongly the K_LINEAR instance.

This is how I would write it for "K1" for example:
k=0.41
L1=L1l
L2=L2r1


I use that as well and works great.

- - - Updated - - -

Review coupling of K2,K5 and K6.

I think this problem is solved...
Now, this is creating trouble (attached) although alll coefficients are in range..

 

[FvM]

Spice parameter K isn't the same as mutual inductance M. Review the reference manual about there relation.

|K| > 1 is physically impossible.

 

[MuhammadSana]

I have worked with the K, and purposely make it <1, Now this new problem is there...

 

[mtwieg]

Keep in mind that with more than two windings, there constraints on the values of k aside from -1<k<1. For example, if you have three inductors L1 L2 L3, then if you define k12=1 then k13 and k23 must be equal to each other (k23=k13).

Rather than coupling coefficients, you may find it more intuitive to model your coupled inductors with an impedance matrix Z.

 

[CataM]

Now this new problem is there..

You need ground at every single circuit, unlike your post #1 schematic.

 

[MuhammadSana]

You need ground at every single circuit, unlike your post #1 schematic.

I don't know why the loop is to be broken, as mentioned in the err?

 

[CataM]

I don't know why the loop is to be broken

V1 is applied directly across L1s. Add a small series resistance.
Coupling of K5 is 0..5 ? Correct the double dots.

 

[MuhammadSana]

V1 is applied directly across L1s. Add a small series resistance.
Coupling of K5 is 0..5 ? Correct the double dots.

Thanks for the guidance.... its working..
Now, I want to done the couplings which are >1 in magnitude.. HOW can I make it possible??
Is the inductors supporting k>1 mag, are different than normally used??
I have used a discrete type inductor..

 

[niki]

|K| > 1 is physically impossible. You have to denormalize the values of the coupling matrix.

 

[FvM]

I still suspect the OP is confusing mutual inductance M and SPICE coupling factor k.

 

[niki]

Many CAD tools use both representations.
In my favorite tool it looks like this (Microwave Office / AWR):

With each new tool, the user has to take care of modeling.

 

[MuhammadSana]

|K| > 1 is physically impossible. You have to denormalize the values of the coupling matrix.

I have to implement this one
Now how can I make such coupling within range 0-1. Moreover, I am just unable to understand N- N+ non resonating nodes here in the matrix...

 

[niki]

I don't understand this coupling matrix either. Do you know the origin of this matrix?

 

[MuhammadSana]

I don't understand this coupling matrix either. Do you know the origin of this matrix?

Well I have just sited it in a paper....
Any information regarding the concept of Non Resonating nodes??