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3. 发明公开

EP0318444A1 An arrangement for compensating errors in a quadrature modulator 失效
标题翻译： Vorrichtung zur Fehlerkompensierung in einem Quadraturmodulator。
公开(公告)号：EP0318444A1
公开(公告)日：1989-05-31
申请号：EP88850351.3
申请日：1988-10-19
申请人： TELEFONAKTIEBOLAGET L M ERICSSON
发明人： Hedberg, Bo Gösta
IPC分类号： H03C3/00
CPC分类号： H03C3/40 , H03B2202/08 , H03C1/00 , H03C1/50 , H03C2200/0058 , H03D7/161
摘要： An arrangement for compensating errors occurent in a quadrature modulator. The modulator includes means (1) for generating quadrature signals (cos a(t), sin a(t)) in the baseband, each of which signals is delivered to a respective branch in the modulator; means (2) for generating two high frequency signals (cos wt, sin wt) with a mutual phase difference of 90 degrees; mixers (3, 4) for mixing the quadrature signals (cos a(t), sin a(t)) with the high frequency signals (cos wt, sin wt) and an adder (5) for producing the sum of the output signals of the mixers (3, 4). Amplitude errors and phase errors are compensated with the aid of a separate compensating network (11, 12, 14, 16, 17, 19, 21) which is incorporated in the low frequency part of the modulator and which includes adjustable signal generating means (14, 16, 19). Local oscillator leakage is compensated with the aid of a second compensating network (13, 15, 18, 20) which is also incorporated in the low frequency part of the modulator and which also includes adjustable signal generating means (15, 18). The signals (k4, k5) from the latter means (15, 18) are subtracted from the signals occuring in the two branches of the modulator.
摘要翻译：在正交调制器中发生用于补偿误差的装置。调制器包括用于产生基带中的正交信号（cos a（t），sin a（t））的装置（1），每个信号被传送到调制器中的相应分支; 用于产生相互相差为90度的两个高频信号（cos wt，sin wt）的装置（2）; 用于将正交信号（cos a（t），sin a（t））与高频信号（cosww，sinθw）和加法器（5）混合的混频器（3,4），用于产生输出信号的混合器（3,4）。借助于并入调制器的低频部分中的单独的补偿网络（11,12,14,16,17,19,21）来补偿幅度误差和相位误差，该补偿网络包括可调信号发生装置（14 ，16,19）。借助于也被并入调制器的低频部分并且还包括可调信号发生装置（15,18）的第二补偿网络（13,15,18,20）来补偿本地振荡器泄漏。从调制器的两个分支中发生的信号中减去来自后一装置（15,18）的信号（k4，k5）。

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