Telecommunications – Transmitter – Including tuning
Reexamination Certificate
2006-06-27
2006-06-27
Le, Lana (Department: 2685)
Telecommunications
Transmitter
Including tuning
C455S114100, C455S102000, C375S296000
Reexamination Certificate
active
07068983
ABSTRACT:
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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Kanazawa Norio
Tsuchiya Masahiro
Anritsu Corporation
Frishauf Holtz Goodman & Chick P.C.
Le Lana
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