Wireless circuitry with reconfigurable signal coupler

A signal coupler disposed on a substrate and comprising:

• a signal path that includes a first winding in a first metallization layer of the substrate, the first winding being coupled between input and output nodes of the signal coupler;
• a coupled path that is electromagnetically coupled to the signal path and that includes
• a second winding in a second metallization layer of the substrate and overlapping the first winding,
• a third winding in the first metallization layer, the first winding laterally extending around the third winding, and
• a fourth winding in a third metallization layer of the substrate and overlapping the first and second windings;
• and
• a switch that couples a coupled node of the signal coupler to a first terminal on the second winding and a second terminal on the fourth winding.

A method of operating wireless circuitry comprising:

• transmitting a signal along a signal path of a signal coupler, the signal coupler including first and second conductors coextensive with the signal path;
• placing the signal coupler in a first state by adjusting first and second switches to configure the first and second conductors to form a coupled path of the signal coupler, the first switch coupling the first conductor to the second conductor, and the second switch coupling the first and second conductors to a coupled node of the signal coupler;
• passing, using the first and second conductors, a first portion of the signal to a power detector while the signal coupler is in the first state;
• placing the signal coupler in a second state by adjusting the first and second switches to remove the first conductor from the coupled path;
• passing, using the second conductor, a second portion of the signal to the power detector while the signal coupler is in the second state;
• and
• measuring, using the power detector, power levels of the first and second portions of the signal.