Abstract:

A high precision power detection method for wideband power amplifier is proposed base on theoretical analysis.The relation between the power under test and the detected voltage in the circuit is obtained by simple measurement to solve the uncertainty of the variation of circuit component parameters with frequency,thus improving the detection precision.The difference between detected and measured results of power amplifier at 40~56 dBm is less than 0.8 dB.

Key words: directional coupler, power detection, log detector