资源详细信息
基于开关电容技术的锁定放大器设计 - 资源详细说明
锁定放大是微弱信号检测的重要手段。基于相关检测理论,利用开关电容的开关实现锁定放大器中乘法器的功能,提出开关电容和积分器相结合以实现相关检测的方法,并设计出一种锁定放大器。该锁定放大器将微弱信号转化为与之相关的方波,通过后续电路得到正比于被测信号的直流电平,为后续采集处理提供方便。测量数据表明锁定放大器前级可将10-6 A的电流转换为10-1 V的电压,后级通过带通滤波器级联可将信号放大1×105倍。该方法在降低噪声的同时,可对微弱信号进行放大,线性度较高、稳定性较好。
- Abstract:
- Lock-in Amplifying(LIA)is one of important means for weak signal detection. Based on cross-correlation detection theory, switch in the swithched capacitor was used as multiplier of LIA, and a new method of correlation detection was proposed combining swithched capacitor with integrator. A kind of LIA was designed which can convert the weak signal to square-wave, then DC proportional to measured signal was obtained through follow-up conditioning circuit, providing convenience for signal acquisition and processing. The measured data shows that the electric current(10-6 A) can be changed into voltage(10-1 V) by LIA, and the signal is magnified 1×105 times by cascade band-pass filter. The noise is suppressed and the weak signal is amplified. It has the advantages of good linearity and stability.
立即下载 基于开关电容技术的锁定放大器设计
提示:下载后请用压缩软件解压,推荐使用 WinRAR 或 7-Zip
下载说明与使用指南
下载说明
- 本资源需消耗 2积分
- 24小时内重复下载不扣分
- 支持断点续传功能
- 资源永久有效可用
使用说明
- 下载后使用解压软件解压
- 推荐使用 WinRAR 或 7-Zip
- 如有密码请查看资源说明
- 解压后即可正常使用
积分获取方式
- 上传优质资源获得积分
- 每日签到免费领取积分
- 邀请好友注册获得奖励
- 查看详情 →