ATEM接收机前置放大器设计与实现

摘要

为了满足时间域航空电磁法(以下简称ATEM)测量系统对前置放大器的设计要求,制作实现了一款适用于ATEM系统的前置放大器.本文主要讲解了对空芯多圈线圈的阻抗匹配的原则;采用差分式放大电路对微弱二次场信号进行放大的原理;采用DRV134和INA137的平衡电路进行信号长线传输的技术;采用巴特沃斯型二阶低通滤波器设计电路的应用.实践证明,该前置放大器实现并满足了设计要求,有效的抑制了相关干扰噪声,提高了信号的识别能力,保证了较高的动态范围,在实际工作中取得了良好的效果.%In order to meet the design requirements of the airborne time-domain electromagnetic method (ATEM) measurement system, a preamplifier has been designed to suit ATEM system. This paper mainly explains the principle of the impedance matching of the multi-turn air-core coil; the principle of using the differential amplifier circuit to amplify the weak secondary field signal;the technology of using balance circuit of DRV134 and INA137 for signals ' long-line transmission; the application of using the Butterworth second-order low pass filter to design circuits. Practice has proved that the preamplifier had been implemented and met the design requirements. It could effectively restrain the correlation noise , and improve the recognition ability of signals , and guarantee a high dynamic range.This preamplifier has achieved good results in practical work.