VSWR measurement circuit, wireless communication device, VSWR measurement method and VSWR measurement program

摘要

Based on the digital signal to the main signal portion extracted and converted by A / D CONV (10) in PA first CPL of the main signal amplified by (4) (5), a distortion compensation of the main signal In VSWR measurement circuit including a distortion compensation circuit (13) to perform the power level of the reflected signal included in the feedback signal extracted at the second CPL which is disposed in a position to connect via a cable to the antenna terminal (7) To measured by the power measuring unit (16), the main signal taken out from the previous stage of the distortion compensation circuit (13) and said feedback signal extracted by the second CPL (7) to the A / D CONV (10) Te as an input a signal which is converted into a digital signal, the feedback main signal component included is removed to the signal, the reflected signal alone is taken out and outputs to the power measuring unit (16) the main signal component removing circuit (11 It comprises a). This small size, enables cost reduction, and it is possible to provide a VSWR measurement circuit for accurate VSWR measurement function.