Power and impedance measurement circuits for a wireless communication device

摘要

Exemplary embodiments disclosed are directed to power and impedance measurement circuits that may be used to measure power and/or impedance are described. A measurement circuit may include a sensor and a computation unit. The sensor may sense (i) a first voltage signal across a series circuit coupled to a load to obtain a first sensed signal and (ii) a second voltage signal at a designated end of the series circuit to obtain a second sensed signal. The sensor may mix (i) a first version of the first sensed signal with a first version of the second sensed signal to obtain a first sensor output and (ii) a second version of the first sensed signal with a second version of the second sensed signal to obtain a second sensor output. The computation unit may determine the impedance and/or delivered power at the designated end of the series circuit based on the sensor outputs.

主权项

1. An apparatus comprising:
a sensor coupled to each of first and second ends of a circuit coupled to a load and configured to measure a voltage drop across the circuit to obtain a first sensed signal, to sense a second voltage signal at the second end of the circuit to obtain a second sensed signal, and to provide a sensor output generated based at least in part on multiplying the first and second sensed signals; and a computation unit coupled to the sensor and to compute power observed at the load based on the sensor output.