Separate impedance transformation from balanced excitationName the ports. Then choose the transition.Functional diagram ยท no component values or approved schematicUnbalanced porte.g. a coax interfaceBalun / transitionDefined band and loadMatching as requiredTwo armsCheck 1: impedance and insertion lossCheck 2: balance and common-mode behavior over the bandA differential chip port needs its own load, bias and matching reference.