发明名称 |
METHOD FOR DETECTING QUADRATURE MODULATOR CARRIER LEAK ADJUSTING POINT BY GEOMETRICAL ANALYSIS/CALCULATION METHOD, CARRIER LEAK ADJUSTING METHOD, AND QUADRATURE MODULATION APPARATUS |
摘要 |
<p>The first, second, and third pairs of DC voltages which set a modulated signal to a predetermined reference level while the levels of I and Q signals supplied to a quadrature modulator are set at "0" are sequentially obtained. On the basis of the first, second, and third pairs of DC voltages, at least three measurement points based on a combination of pairs of DC voltages which set the level of the modulated signal to the predetermined reference level are decided. The coordinates of the center of a virtual circle having the three measurement points positioned on its circumference are automatically calculated by a geometric analytical computation. Adjustment voltages to be added to the I and Q signals so as to cancel out a carrier leak contained in the modulated signal are obtained from the coordinates of the center. <IMAGE></p> |
申请公布号 |
EP1478145(A1) |
申请公布日期 |
2004.11.17 |
申请号 |
EP20030706969 |
申请日期 |
2003.02.19 |
申请人 |
ANRITSU CORPORATION |
发明人 |
KANAZAWA, NORIO;TSUCHIYA, MASAHIRO |
分类号 |
H03C1/52;H03C3/40;H04L27/00;H04L27/20;H04L27/36;(IPC1-7):H04L27/00 |
主分类号 |
H03C1/52 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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