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

Patent metadata

Field	Value
Publication number	US-9054759-B2
Application number	US-201214114499-A
Country	US
Kind code	B2
Filing date	May 29, 2012
Priority date	May 30, 2011
Publication date	Jun 9, 2015
Grant date	Jun 9, 2015

Abstract

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.

First claim

The invention claimed is:

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 coup…

Assignees

• Watanabe Junji
• Nec Corp

Inventors

• Watanabe Junji

Classifications

• H04B2001/0425

  Electricity · mapped topic

• H04B1/0475 Primary

  Electricity · mapped topic

• H03F2200/465

  Electricity · mapped topic

• H03F2200/204

  Electricity · mapped topic

• H03F3/195

  Electricity · mapped topic