Back to the future - [comms power]

Cellular operators are turning green. They are demanding that basestation and core network equipment consume less power. This is not just to satisfy a fashionable sustainability agenda but to deal with the waves of data they are now pushing out to the latest generations of smartphones. In some cases, they have been going back through the annals of RF circuit design to the 1930s to come up with new (old) ways to eke out their power budgets.