摘要
在舰船电场测量中,由于电场信号频率极低而且很微弱,利用现有检测设备难以测量,关键在于前置电路的噪声性能较差。本文针对舰船电场信号的特点,设计了一种由分立元件构成的极低频低噪声前置放大电路。该电路结构简单合理,同时具有良好的噪声性能,适于低内阻信号源的低噪声放大。文中给出了详细的分析和电路实现。该电路通过理论计算及pspice验证,等效输入噪声电压仅为1.49nV/Hz～1/2。
In the electric field measurement of the naval vessel, because the frequency of the electric field is extremely low and very faint,it is difficult to measure by existing checkout equipment. The key lies in the noise performance of the preamplifier circuit, which is tarnally bad. This paper designs a low frequency lownoise amplifier composed of discrete components. This circuit has simple structure and good noise performance, and is suitable for amplifying the source of low resistor. It presents the detail analysis and circu/t in the article After the theory calculating and pspice verifying, it shows that equivalent input noise voltage of this circuit is only 1.49 nV/√Hz.
出处
《电子测量技术》
2008年第5期56-58,共3页
Electronic Measurement Technology
基金
海军工程大学自然科学基金项目资助
关键词
电场测量
噪声参数
放大器
electric field measurement noise parameter amplifier
