基于多乘法器的频谱线性变换实验

Experiment of Spectrum Linear Conversion Based on Multiple Multiplier

设计一种基于多乘法器的频谱线性变换实验系统,以实现对信号进行线性频谱搬移的功能。利用AD9834、AD9854芯片分别作为载波信号源和本振信号源输入,通过输入一个8 kHz基带调制信号,利用乘法器AD835对调制信号进行第一次AM调制,将其搬运至30 MHz高频频段;利用乘法器AD834对已调信号进行上变频,将其搬运至甚140 MHz甚高频频段;利用混频器AD831对已调信号进行下变频,将其搬运至高中频10 MHz频段,实现一个完整的频谱线性搬移通信电子系统的设计与应用。系统适用于通信电子线路综合实验教学,学生通过实验可全面理解、掌握频谱线性变换工作原理及设计方法。

This paper designs an experimental system based on linear multiple multiplier spectrum conversion to achieve the function of linear spectrum shift of the signal.The AD9834 and AD9854 are used as the carrier signal source and the local oscillator signal source input,respectively.By inputting an 8KHz baseband modulation signal,the multiplier AD835 performs the first AM modulation on the modulation signal and transports it to the high-frequency 30 MHz band.Then it uses the multiplier AD834 to up-convert the modulated signal and transfer it to the VHF 140 MHz band.Finally,the AD831 is used to down-convert the modulated signal and transfer it to the high intermediate frequency 10 MHz frequency band,so as to work out the design and application of a complete spectrum linear conversion communication electronic system.This is very suitable for comprehensive experimental teaching of communication electronic circuits.Students can fully understand and master the working principle and design method of spectrum linear conversion through experiments,and it lays a good foundation for the design of communication electronic circuits.