Electronic device with couplers for power wave detection in multiple reference planes
An electronic device may include signal transmission circuitry having a signal path and a signal source that transmits a signal on the signal path. First and second signal couplers may be coupled to the signal path. Control circuitry may use the first signal coupler to measure the signal at a first reference plane and may use the second signal coupler to concurrently measure the signal at a second reference plane. The signal measurements may include power wave, forward wave, reverse wave, impedance, and/or delivered power measurements. Terminations in the signal couplers may be adjusted to dynamically shift the reference planes. The first and second signal couplers may be formed from first and third metallization layers on a stacked dielectric substrate, where the signal path is formed from a second metallization layer. Additional signal couplers may be coupled to the signal path for concurrently measuring additional reference planes.
1 . A method of operating an electronic device, the method comprising:
with a signal source, transmitting a signal along a signal path;
with a first signal coupler coupled to the signal path, measuring a power wave of the signal at a first reference plane along the signal path; and
with a second signal coupler coupled to the signal path, measuring a power wave of the signal at a second reference plane along the signal path concurrent with measurement of the power wave at the first reference plane by the first signal coupler, the second reference plane being different from the first reference plane.
2 . The method of claim 1 , wherein measuring the power wave of the signal at the first reference plane comprises measuring a forward wave (FW) and a reverse wave (RW) of the signal at the first reference plane.
3 . The method of claim 2 , wherein measuring the power wave of the signal at the second reference plane comprises measuring a FW and a RW of the signal at the second reference plane.
4 . The method of claim 1 , further comprising:
adjusting a termination impedance of the first signal coupler to shift the first reference plane along the signal path.
5 . The method of claim 4 , further comprising:
adjusting a termination impedance of the second signal coupler to shift the second reference plane along the signal path.
6 . An electronic device comprising:
an antenna;
a power amplifier coupled to the antenna over a signal path and configured to transmit a radio-frequency signal on the signal path;
a first signal coupler coupled to the signal path;
a second signal coupler coupled to the signal path; and
one or more processors configured to
measure the radio-frequency signal at a first reference plane along the signal path using the first signal coupler, and
measure the radio-frequency signal at a second reference plane along the signal path using the second signal coupler concurrent with measurement of the radio-frequency signal at the first reference plane using the first signal coupler, the second reference plane being different from the first reference plane.
7 . The electronic device of claim 6 , wherein the first signal coupler has a first termination with a first impedance, the second signal coupler has a second termination with a second impedance different from the first impedance, and the one or more processors is configured to adjust the first impedance of the first termination to shift a location of the first reference plane along the signal path.