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Mixed mode S parameters......special case!

Question asked by Trevor.Bartram on Apr 28, 2011
Latest reply on Apr 29, 2011 by Trevor.Bartram
Can someone point me to literature that derives the differential gain and match of a four port mixed mode network based on standard four port S parameters where, in the final circuit the common mode excitation at ports 1 and 3 is zero, the load at ports 2 and 4 are well matched, and the network has full symmetry?
Thanks, Trevor.
P.S. A typical example might be a balanced amplifier using 180 degree full hybrids.