特定消谐PWM在抑制相敏检波器谐波响应中的应用  

Selective harmonic elimination PWM for the suppression of harmonic response of phase-sensitive detector

作　　者：廖磊[1] 张晓青[1] 李东[1] 

机构地区：[1]北京信息科技大学现代测控技术教育部重点实验室,北京100192

出　　处：《北京信息科技大学学报（自然科学版）》2010年第4期57-61,共5页Journal of Beijing Information Science and Technology University

基　　金：北京市教委2008年科技发展基金项目(KM200811232012);现代测控技术教育部重点实验室资助项目

摘　　要：为了提高相敏检波器的带宽,解决相敏检波器存在谐波响应的问题,通过分析各种不同频率信号输入时相敏检波器的输出情况,发现相敏检波器产生谐波响应的根本原因在于采用对称方波作为参考信号,提出了采用特定消谐PWM作为相敏检波器的参考信号来有效地抑制相敏检波器谐波响应的新方法。实验结果表明,相敏检波器的谐波响应被抑制了47dB以上,带宽上限提高了3倍。To broaden the band of the phase-sensitive detector and solve the problem of harmonic response of it, a new method to restrain the harmonic response effectively is presentes. Analyses of the output of phase-sensitive detector with all kinds of different frequency signals input, it is the symmetrical square wave as the reference signal that primarily causes harmonic response. The new method uses the se- lective harmonic elimination （PWM） as the reference signal and then is demonstrated effective by the circuit experiment. Finally, the results show that the harmonic response of the phase-sensitive detector is suppressed more than 47dB and the band of it is improved three times.

关 键 词：特定消谐 相敏检波器 谐波响应 抑制 

分 类 号：TN98[电子电信—信息与通信工程]