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General question about PA load/source impedance, i.e. MW7IC2725N

Question asked by Fei Wang on Mar 29, 2017
Latest reply on Apr 3, 2017 by LPP

Generally, a PA datasheet defines the source and load impedance for max gain or max efficiency. Since the PA pins and soldering pads are relatively big, where is the reference plane in term of the impedances? Is it at the far or near edge of the pin to the chip body? Taking MW7IC2725N as one example, in the schematics in page 5 in the datasheet, is the load impedance seen before Z5, Z6 or Z7? Thank you.