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提出一种高效二次变频结构,分两步将中频信号搬移至基带。首先,通过一种将混频器置于滤波器之后的多相滤波宽带数字下变频结构将中频信号搬移至基带附近。然后通过传统的正交混频将信号搬移至基带,能节省滤波器资源,有效地降低采样率和数据处理速率,解决超宽带数字中频处理的难题。最后通过仿真和实验验证结构的正确性。
Proposed an efficient secondary frequency conversion structure, in two steps to move the IF signal to the baseband. First of all, the IF signal is moved to near the baseband by a polyphase filter wideband digital down-conversion structure after the mixer is placed in the filter. Then, the signal is moved to the baseband by the traditional orthogonal mixing, thereby saving the filter resource, effectively reducing the sampling rate and the data processing rate, and solving the problem of ultra-wideband digital intermediate frequency processing. Finally, the correctness of the structure is verified through simulation and experiment.