Patent ID: 11916580
Assignee: QUALCOMM INCORPORATED
Field: Telecommunications (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 17:
18. A method of measuring impedance presented to a port of an integrated circuit, the integrated circuit including a directional coupler, the method comprising:
measuring a voltage level at a second port of the directional coupler in response to a first input received at a first port of the directional coupler;
measuring a voltage level at a third port of the directional coupler in response to the first input received at the first port of the directional coupler;
coupling a second input to the second port of the directional coupler;
measuring a voltage level at the second port of the directional coupler while adjusting a phase difference between the first input and the second input;
measuring a voltage level at the third port of the directional coupler while adjusting the phase difference between the first input and the second input; and
determining an impedance looking into the first port of the directional coupler based on the measured voltage levels and the adjusted phase differences.