低噪声前置放大器的噪声分析与电路设计
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摘要
结合电噪声理论,使用随机过程E_n-I_n模型低噪声的分析方法,对集成运放用于地震信号检测时,如何正确设计低噪声电路以及合理选择器件等问题进行了讨论,并对WAVE-3与OPSEIS-5520两种遥测数字地震仪采集站的前置放大器电路进行了对比分析。此外,探讨了低噪声、高共模抑制比、高输入阻抗前置放大器的组成和设计方法。实际应用该方法的结果表明,这两种低噪声前置放大器在微弱地震信号的测量中有较好的效果。
Low noise preamplifiers have found wide applications in the fields of electronic acoustics, measuring technique, radio and optical communication technique, electronic image processing, geophysical prospecting etc. It is discussed in this paper how to design the low-noise electronic circult and choose components adequately when the integrated kinematic gain is used for detecting seismic signals. On the basis of electronic noise theory, the two designs of preamplifier-circuit WAVE-3 and OPSEIS 5520 of telemetering unit of digital seismic instrumentation are analyzed and studied, using random process low noise model E_n-I_n.
Low noise preamplifiers have found wide applications in the fields of electronic acoustics, measuring technique, radio and optical communication technique, electronic image processing, geophysical prospecting etc. It is discussed in this paper how to design the low-noise electronic circult and choose components adequately when the integrated kinematic gain is used for detecting seismic signals. On the basis of electronic noise theory, the two designs of preamplifier-circuit WAVE-3 and OPSEIS 5520 of telemetering unit of digital seismic instrumentation are analyzed and studied, using random process low noise model E_n-I_n.
引文
1 Friiss HT. Noise Figures of Radio Receivers. Prec. I. R. E, 1944; 32: 419
2 Charles A V. Handbook of Electrical Noise. Tab Books, 1979: 54～62
3 Moustaksa S, Hullett J L. Noise Modelling for Broadband Amplifier Design. Electronic Circuits and System 1981; 128(2) : 67～76
4 Applied Automation Inc. OPSEIS 5520 RSU Maintenance Manual. 1985: 102～113
5 AMF Geo Space Corp. WAVE-3 Technical Manual Array Terminal ATU. 1986: 56～71
6 北方交通大学.低频电子线路.北京:中国铁道出版社,1979:23～332
2 Charles A V. Handbook of Electrical Noise. Tab Books, 1979: 54～62
3 Moustaksa S, Hullett J L. Noise Modelling for Broadband Amplifier Design. Electronic Circuits and System 1981; 128(2) : 67～76
4 Applied Automation Inc. OPSEIS 5520 RSU Maintenance Manual. 1985: 102～113
5 AMF Geo Space Corp. WAVE-3 Technical Manual Array Terminal ATU. 1986: 56～71
6 北方交通大学.低频电子线路.北京:中国铁道出版社,1979:23～332
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