The early concept for how the RF die is packaged or built into a module: package type, substrate, interconnect, integrated passives, shielding and antenna placement.
Architecture Work product in the RF and mmWave product lifecycle
It fixes the main packaging choices early, because at RF and millimetre-wave frequencies the package is part of the circuit. A die designed before the concept is agreed at architecture freeze may rest on interconnect and loss assumptions the final package cannot meet.
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