1. 1.北京印刷学院信息与机电工程学院,北京,102600
2. 北京理工大学电子与信息学院,北京,100081
纸质出版:2010
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FONT face, Verdana, 曹 鹏, 等. 直接正交上变频调制器的镜频抑制与本振泄漏对消技术研究[J]. 电子学报, 2010,38(2A):6-9.
FONT face, Verdana, CAO Peng, et al. The Research on the Image Frequency Rejection and LO-leakage Cancellation of Direct Quadrature up-Converters[J]. Acta Electronica Sinica, 2010, 38(2A): 6-9.
<FONT face=Verdana>镜频干扰和本振泄漏是制约直接正交变频技术在无线通信收发信机中应用的主要技术瓶颈之一.通过分析直接正交上变频调制器中引起镜频干扰和本振泄漏的原因
利用逆向校正方法
给出了一种闭环反馈式正交基带信号预失真数字幅相平衡补偿电路
提出了一种通过调节基带信号的直流偏置实现本振泄漏对消的措施
提高了直接正交上变频器的镜频抑制和本振泄漏对消能力
并给出了在小型化CDMA发射机中的应用实例.
<FONT face=Verdana>The image frequency interference and LO-leakage are the technical bottlenecks
which restrict the performance of the direct quadrature converter in wireless communication transceivers.Analyzed the reasons causing the image frequency interference and LO-leakage in the modulator
and provided a closed-loop feedback baseband qudrature signal pre-distortion circuit
based on the digital amplitude and phase balance compensation by using a reverse-correction method
and gave a circuit to achieve the LO-leakage cancellation through adjusting the DC bias of the baseband signals.Those increased the abilities of the image frequency rejection and LO-leakage cancellation in the modulator
and applied in the design of a CDMA transmitter.
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