文档介绍：摘要:随着科学技术的发展,使测量技术得到日趋完善的发展,同时也提出更高要求。尤其是一些极端条件下的测量已成为现代认识自然的主要手段,由于微弱信号检测(weak signal detection)能测量传统观念认为不能测量的微弱量,所以才获得迅速的发展和普遍的重视,微弱信号检测已逐渐形成一门边缘学科学。锁相放大器(lock-in. Amplifier 简称LIA)就是检测淹没在噪声中的微弱信号的仪器,它可用于测量交流信号的幅度和相位,有极强的抑制干扰和噪声的能力,有极高的灵敏度,可测量毫微伏量级的微弱信号,自1962年美国PARC第一个相干检测的锁相放大器问世以来,锁相放大器有了迅速的发展,性能指标有了很大的提高,现已被广泛应用于科学技术的领域。
关键字:锁相放大课程设计微弱信号检测
Abstract:Along with science's and technology's development, enables the measuring technique to obtain day by day the consummation development, simultaneously also sets a higher request. Especially under some extreme condition's survey has e the modern understanding natural principal means that because the weak signal detection (weak signal detection) can survey the traditional ideas to think cannot survey weak quantity, therefore only then obtains the rapid development and the universal value, the weak signal detection has formed an edge study science gradually. Phase-lock amplifier (lock-in. Amplifier is called LIA) is examines the submergence in the noise weak signal instrument, it may use in surveying the exchange signal the scope and the phase, has the greatly strengthened barrage jamming and noise ability, has the extremely high sensitivity, the measurable quantity millimicro bending down magnitude's weak signal, the American PARC first coherent detection's phase-lock amplifier has been published since 1962, the phase-lock amplifier has the rapid development, the performance index had the very big enhancement, widely was already applied in science and technology many domains.
Keyword:The phase-lock enlarges the curriculum project weak signal detection
目录
前言 1
1. 设计原理 1
1
2
. 工作原理 2
分类 2
基本工作原理 2
模拟锁相环工作原理 2
数字锁相环工作原理 3
2. 方案设计 3
3
3
LM311整形电路 4
4
7
相敏检波器DG201 9
参考通道 10
10
10
11
11
(SNIR) 13
13
3. 锁相环测试 14
4. 原器件清单