Highly accurate true RMS power detector for cellular applications

摘要

New devices and methods capable of detecting a true Root-Mean-Square (RMS) power level of an analog input signal are disclosed. For example, an electronic circuit can include a squaring circuit that receives the analog input signal and processes the analog input signal so as to produce a squared-output of the analog input signal using an analog transfer function of the squaring circuit, and a square-root circuit that receives the squared-output and processes the squared-output using an analog transfer function of the square-root circuit so as to produce an analog RMS output signal representing the true RMS power level of the analog input signal.

主权项

1. An electronic circuit capable of detecting a true Root-Mean-Square (RMS) power level of an analog input signal, comprising
a squaring circuit that receives the analog input signal and processes the analog input signal so as to produce a squared-output of the analog input signal using an analog transfer function of the squaring circuit; and a square-root circuit that receives the squared-output and includes a first amplifier having an analog feedback component to produce a first voltage, a second amplifier having an analog feedback component to produce a second voltage, and a differential amplifier that produces the analog output based on the first voltage and the second voltage so as to produce an analog RMS output signal representing the true RMS power level of the analog input signal.