直交変調器の調整装置及び調整方法並びに通信装置とプログラム

Title:

直交変調器の調整装置及び調整方法並びに通信装置とプログラム

Document Type and Number:

Japanese Patent JP4341418

Kind Code:

B2

Abstract:

Disclosed are an apparatus and a method for the adjustment time for IQ offset of a quadrature modulator of a transmission circuit. In adjusting the I-offset and the Q-offset of a quadrature modulator 10, supplied with an I-signal and a Q-signal from an analog baseband unit 11 to modulate a carrier, set-up values of the I-offset and the Q-offset, associated with at least three different points on an IQ offset correction plane having an I-component and a Q-component as X- and Y-coordinates, are set for the analog baseband unit 11 at respective different set-up timings. The values of the carrier leak level, associated with three-point offset set-up values of the output signal of the quadrature modulator 10, are acquired by a sole measurement operation. From the measured values of the three-point carrier leak levels, the values of the carrier suppression ratio for the three points are found from the measured values of the three points of the carrier leak level to find the optimum set-up values of the I-offset and the Q-offset.

Inventors:

Satoshi Niwa
Kazuo Okoro

Application Number:

JP2004024034A

Publication Date:

October 07, 2009

Filing Date:

January 30, 2004

Export Citation:

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