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 |
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.
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申请公布号 |
US2004162038(A1) |
申请公布日期 |
2004.08.19 |
申请号 |
US20030474391 |
申请日期 |
2003.10.09 |
申请人 |
KANAZAWA NORIO;TSUCHIYA MASAHIRO |
发明人 |
KANAZAWA NORIO;TSUCHIYA MASAHIRO |
分类号 |
H03C1/52;H03C3/40;H04L27/00;H04L27/20;H04L27/36;(IPC1-7):H01Q11/12;H04B1/02;H04B1/04 |
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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