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一种脉冲同步消噪电路的设计与实现

更新时间:2020-10-27 20:56:39 大小:2M 上传用户:zhengdai查看TA发布的资源 标签:消噪电路 下载积分:1分 评价赚积分 (如何评价?) 打赏 收藏 评论(0) 举报

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针对脉冲信号经过传输和信号变换后,在电路终端常常出现的不同步或干扰等问题,设计实现了一种基于可重触发单稳态触发器74LS122、集成运放F741的同步消噪电路。通过单稳态触发器74LS122的可重触发性和暂稳态时间的可调节性,实现了对脉冲信号变化规律的跟踪和信号的选取;利用F741的工作特性,在电子开关的配合下,对脉冲间隔期间的噪声进行了完全消除,对有效脉冲信号进行倍数放大,提高了信号的对比度。该电路信号跟踪能力强、信号对比度高、设计简单、调整方便、实用性强,可用于多普勒接收机中方位脉冲的同步提取和消噪处理。

In order to solve the problems of non-synchronization or interference which often occur in the circuit terminal after the pulse signal is transmitted and transformed,a synchronous de-noising circuit based on retriggered Monostable flip-flop 74LS122 and integrated operational amplifier F741 is designed and implemented. Through the retrigger property of 74LS122 and the adjustable time of transient state, the change rule of pulse signal and the selection of signal are realized. By using the working characteristic of F741 and the cooperation of electronic switch,the noise during the pulse interval is completely eliminated,and the effective pulse signal is magnified by multiple amplification,and the contrast of the signal is improved. The circuit has the advantages of high signal tracking ability,high signal contrast, simple design,convenient adjustment and strong practicability. It can be used for synchronous extraction and de-noising of azimuth pulse in Doppler receiver.

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