skrf.network.Network.se2gmm¶

Network.se2gmm(p, z0_mm=None)[source]¶

Transform network from single ended parameters to generalized mixed mode parameters 1

Warning

This is not fully tested, and should be considered as experimental

Parameters

p (int) – number of differential ports
z0_mm (Numpy array) – f x n x n matrix of mixed mode impedances, optional if input is None, 2 * z_o Ohms differential and z_0 / 2 Ohms common mode reference impedance is used

Return type

None

Note Odd Number of Ports

In the case where there are an odd number of ports (such as a 3-port network with ports 0, 1, and 2), se2gmm() assumes that the last port (port 2) remains single-ended and ports 0 and 1 are converted to differential mode and common mode, respectively. For networks in which the port ordering is not suitable, port renumbering can be used.

Examples

For example, a 3-port single-ended network is converted to mixed-mode parameters:

| Port 0 (single-ended, 50 ohms) --> Port 0 (single-ended, 50 ohms)
| Port 1 (single-ended, 50 ohms) --> Port 1 (differential mode, 100 ohms)
| Port 2 (single-ended, 50 ohms) --> Port 2 (common mode, 25 ohms)

>>> ntwk.renumber([0,1,2], [2,1,0])
>>> ntwk.se2gmm(p=1)
>>> ntwk.renumber([2,1,0], [0,1,2])

In the resulting network, port 0 is single-ended, port 1 is differential mode, and port 2 is common mode.

References

1: Ferrero and Pirola; Generalized Mixed-Mode S-Parameters; IEEE Transactions on Microwave Theory and Techniques; Vol. 54; No. 1; Jan 2006