高精度数字锁相放大器以及微弱信号检测方法
By designing a high-precision digital lock-in amplifier, utilizing a cascaded IIR filter and the CORDIC algorithm, and optimizing the lock-in amplification algorithm, the problems of fixed frequency and low accuracy of traditional lock-in amplifiers are solved, achieving high-precision detection of weak signals, which is applicable to fields such as infrared spectrophotometers.
CN116388750BActive Publication Date: 2026-07-17NANJING UNIV OF SCI & TECH
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- NANJING UNIV OF SCI & TECH
- Filing Date
- 2023-03-03
- Publication Date
- 2026-07-17
AI Technical Summary
Technical Problem
Traditional lock-in amplifiers have fixed frequencies, small dynamic ranges, and low precision, making them difficult to effectively detect weak signals.
Method used
Design a high-precision digital lock-in amplifier, including a preprocessing module, a phase detection module, and a vector operation module. Employ a cascaded IIR filter and the CORDIC algorithm, combined with moving average processing, to optimize the lock-in amplification algorithm. Use an AD7760 analog-to-digital converter and DDS technology.
Benefits of technology
It improves the accuracy and flexibility of weak signal detection, reduces power consumption, and meets the size and power consumption requirements of fields such as infrared spectrophotometers.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure CN116388750B_ABST
Abstract
本发明设计了一种高精度数字锁相放大器以及微弱信号检测方法，包括以下步骤：由探测器输入原始待测信号，经过滤波器、放大器等预处理电路，构成输入信号；通过直接数字频率合成技术解算出与输入信号同频、相位差固定的正弦余弦信号后，与输入信号相乘，实现相敏检测的功能；再分别将相乘后的两个分量通过设计的滤波器进行低通滤波；最后通过矢量运算模块计算出原输入信号的幅值和相位。本发明通过对锁相放大算法进行设计和优化，有效提高了微弱信号检测的准确性，能够检测出待测信号的幅值与相位等相关信息。
Need to check novelty before this filing date? Find Prior Art