Title:
CALIBRATION CIRCUIT, COMMUNICATION APPARATUS, CALIBRATION METHOD, AND PROGRAM
Document Type and Number:
Japanese Patent JP2015154435
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a calibration circuit capable of continuing communication processing even while adjusting an I signal and a Q signal in order to reduce a carrier leak, and to provide a communication apparatus, a calibration method, and a program.SOLUTION: A calibration circuit 1 includes: a leak detection section 10 which inputs a modulated signal on which quadrature modulation has been performed, from a quadrature modulator that performs the quadrature modulation on the basis of a baseband signal including an I signal and a Q signal, and detects output intensity of a carrier leak included in the modulated signal; a baseband output intensity adjustment section 121 capable of adjusting the output intensity of the baseband signal; and a DC offset voltage adjustment section 122 capable of individually adjusting a DC offset voltage of the I signal or the Q signal so that the output intensity of the DC offset voltage detected by the leak detection section 10 becomes equal to or lower than a determination threshold value. When the leak detection section 10 detects the output intensity of the carrier leak, the baseband output intensity adjustment section 121 reduces the output intensity of the baseband signal within such a range that the quadrature modulator can maintain communication.
Inventors:
IIZUKA HIROTO
Application Number:
JP2014029116A
Publication Date:
August 24, 2015
Filing Date:
February 19, 2014
Export Citation:
Assignee:
NEC CORP
International Classes:
H04L27/36; H04L27/20
Attorney, Agent or Firm:
Sumio Tanai
Ryuichiro Mori
Naoki Matsuo
Ryuichiro Mori
Naoki Matsuo
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