VSWR measurement circuit, radio communication apparatus, VSWR measurement method, and recording medium having VSWR measurement program stored thereon

摘要

In this VSWR measurement circuit, a power measurement unit measures the power level of a reflected signal which is included in a feedback signal which has been extracted at a second CPL which has been deployed at a position connecting to an antenna end via a cable. To this end, the VSWR measurement circuit is provided with a main signal component removal circuit, wherein the main signal which has been extracted from the prestage of a digital pre-distortion circuit, and a signal in which the feedback signal that had been extracted at the second CPL has been converted to a digital signal at an A/D CONV, are provided as inputs, the main signal component included in the feedback signal is removed, and only the reflected signal is extracted so as to be output to the power measurement unit.

主权项

1. A VSWR measurement circuit comprising:
a first directional coupler that extracts a partial main signal of main signals amplified by a power amplifier in order to transmit from an antenna; an analog/digital converter that converts the main signal extracted by the first directional coupler; a distortion compensation circuit that performs distortion compensation by using the signal converted by the analog/digital converter; a second directional coupler that is connected to an antenna terminal through a cable, and extracts a reflection signal included in feedback signals; a power measurement unit that performs power measurement of the main signal extracted by the first directional coupler and the reflection signal extracted by the second directional coupler, respectively, and measures a VSWR (Voltage Standing Wave Ratio); and a main signal component removing circuit that removes a main signal component included in the feedback signals to output to the power measurement unit, with a main signal taken out from a preceding stage of the distortion compensation circuit and signals in which the feedback signals are converted into digital signals by the analog/digital converter being set as inputs.