摘要
介绍了一种L波段双通道解调器中频单元的设计方案,主要分析了2个关键问题:频率配置和电平配置。对于频率配置:首先通过比较,证明了二次变频方案比直接变频方案更有优势;然后对二次变频方案中的难点—频率配置进行了详细分析。最后介绍滤波器的选择,分析了各种滤波器的作用并给出了具体型号的选择。对于电平配置,主要分析了增益配置和衰减器的配置。
An U-band double-channel IF unit is described in this paper. Two key issues are discussed： frequency configuration and level configuration. For frequency configuration, first, through the comparison between the direct conversion mechanism and the dual conversion mechanism, it is proven that the dual conversion mechanism is more adaptable for implementing lower spurious outputs of signal. Secondly, the key point - frequency configuration is analyzed. At last, the selection of filters is described, including the analysis of function of each filter and the type selection. For level configuration, gain configuration and attenuator configuration are mainly analyzed.
出处
《无线电通信技术》
2009年第5期62-64,共3页
Radio Communications Technology
关键词
L波段
双通道解调器
中频
频率配置
电平配置
L-band
double-channel demodulator
IF unit
frequency configuration
level configuration
