Maybe some electronics guru here please claify this ? Is adding the S matrices of two devices the same as adding the Z matrices, given that the S matrix of a device can be obtained from the Z matrix and vice versa.
For example, I want to destabilize a RF BJT, I can add positive feedback to its base with a series inductor. The Z matrix of the combination is the sum of the Z matrices of the BJT and the inductor. Is this operation the same as adding the S matrices of the two and then obtining the Z matrix of the combination ?
Thanks for your thoughts and ideas on this.