【摘要】 基于I/Q调制的快速频率合成方法比目前采用的频率合成方法更易调试,而且使用灵活。其思路是将信号先通过单边带调制,将较低频率调制到需要的频率范围;然后采用对基带信号的数字预补偿方法来抑制镜像频率和载波泄漏,从而达到应用的目的。文章中还给出一种基于输出信号包络信息的补偿系数调整算法,其仿真结果说明该新补偿算法可以有效抑制镜像频率和载波泄漏。更多还原

【Abstract】 A frequency synthesizer technique based on I/Q adjustment makes it easier to debug and use comparing with the ongoing method.First,a low frequency tone is up-converted to the needed frequency range by means of SSB(single side band modulation).Then we perform digital pre-compensation method,which can be used in the processing of base band signal to reject image frequency and protect carrier leak to meet the application purpose.Furthermore,an algorithm according to the envelope of out signals for updating the compensator coefficients is proposed.Simulation results illustrate the excellent performance of the proposed pre-compensation structure can significantly reject image frequency and protect carrier leak.更多还原