Patent ID: 6856199

Claim:
A distributed active transformer comprises: a primary winding further comprising: four sections, wherein each section terminates in one of the pairs of amplifiers; a first switch connected to one of the amplifiers from a first section and to one of the amplifiers from a second section, where the switch can be used to bypass the two push/pull amplifiers so connected; a second switch connected to another of the amplifiers from the second section and to one of the amplifiers from a third section, where the switch can be used to bypass the two amplifiers so connected; a third switch connected to another of the amplifiers from the third section and to one of the amplifiers from a fourth section, where the switch can be used to bypass the two amplifiers so connected; a fourth switch connected to another of the amplifiers from the fourth section and to another of the amplifiers from the first section, where the switch can be used to bypass the two amplifiers so connected; and a secondary winding disposed adjacent to the primary winding; and wherein the primary winding and the secondary winding are disposed on a semiconductor substrate and wherein the distributed active transformer operates in a high power mode when all four switches are open, in a medium high power mode when three switches are open, in a medium low power mode when two switches are open, and in a low power mode when a single switch is open.