US 11,888,504 B2
Electronic devices with output load independent detection capabilities
Lucas Calderin, Berkeley, CA (US); and Mehmet T Ozgun, Austin, TX (US)
Assigned to Apple Inc., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on Feb. 18, 2022, as Appl. No. 17/675,983.
Prior Publication US 2023/0268941 A1, Aug. 24, 2023
Int. Cl. H04B 1/04 (2006.01); H03F 3/24 (2006.01)
CPC H04B 1/0475 (2013.01) [H03F 3/245 (2013.01); H03F 2200/451 (2013.01); H04B 2001/0416 (2013.01)] 16 Claims
OG exemplary drawing
 
1. An electronic device comprising:
a signal source;
an output load coupled to the signal source over a signal path, the signal source being configured to transmit a signal to the output load over the signal path and the output load having a first reflection coefficient;
a signal coupler disposed on the signal path, the signal coupler having a first node communicably coupled to the signal source, a second node communicably coupled to the output load, a third node, and a fourth node, and the signal coupler being characterized by scattering parameters S21, S32, S22, and S31;
a power detector communicably coupled to the third node and configured to measure a voltage at the third node; and
a termination communicably coupled to the fourth node, the termination having circuit components that configure the termination to exhibit a second reflection coefficient that is directly proportional to S21*S32−S22*S31.