Multi-frequency digital phase-locked amplification method and device based on coherent sampling

Through coherent sampling and synchronous digital phase locking methods, synchronous real-time demodulation of multi-frequency signals is achieved, solving the accuracy and resource consumption problems of existing digital phase locking amplifiers in multi-frequency signal processing, and improving the performance and adaptability of phase locking amplifiers.

CN120357895AActive Publication Date: 2025-07-22HUNAN NORMAL UNIVERSITY
View PDF 10 Cites 2 Cited by

Patent Information

Application Number
CN202510847332.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-06-24
Publication Date
2025-07-22
Estimated Expiration
2045-06-24

AI Technical Summary

Technical Problem

When processing multi-frequency signals, existing digital phase-locked amplifiers have problems such as low demodulation accuracy, high resource consumption, and inability to meet the multi-frequency response characteristics requirements, especially in scenarios such as bioelectric impedance analysis and spectral detection.

Method used

Using a multi-frequency digital phase-locking amplification method based on coherent sampling, a multi-frequency digital phase-locking amplification unit is established to realize synchronous real-time demodulation of the multi-frequency signal by applying a sinusoidal reference signal excitation to the object to be measured, coherent sampling and synchronous digital phase-locking.

Benefits of technology

It improves the accuracy and speed of the phase-locked amplifier, reduces the design difficulty and resource consumption of the pass filter, realizes stable and reliable processing of multi-frequency signals, and improves the adaptability and measurement accuracy of the system.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN120357895A_ABST
    Figure CN120357895A_ABST
Patent Text Reader

Abstract

The invention discloses a multi-frequency digital phase-locked amplification method and device based on coherent sampling, and the method comprises the steps: applying multi-frequency sine reference signal excitation containing K reference frequencies to a measured object, and obtaining an impedance response signal of the measured object; performing coherent sampling on the impedance response signal; performing synchronous digital phase locking of K reference frequencies on the discrete impedance response signal sequence to obtain amplitudes and phases under the K reference frequencies; the device comprises a front-end unit and a rear-end unit, the front-end unit comprises a positive and negative current source and a current amplifier, and the rear-end unit comprises a control processing module, a DA conversion and low-pass filtering module and a low-pass filtering and AD conversion module. The invention aims to improve the digital lock-in amplifier so that the digital lock-in amplifier can synchronously process multi-frequency signals, reduce the design difficulty and resource consumption of a pass filter and improve the precision and speed of the lock-in amplifier, so that the digital lock-in amplifier is stable and reliable and has wide adaptability.
Need to check novelty before this filing date? Find Prior Art

Citation Information

Patent Citations

  • Signal frequency component detection system based on multi-frequency digital phase-locked amplifier and FPGA implementation method

    CN114978181A

  • Multi-signal excitation and coherent sampling multi-frequency EIT detection system and detection method

    CN115089158A

  • Digital phase-locked amplifier and use method

    CN118508957A

  • Digital phase-locked amplifier based on frequency adaptive technology and weak signal acquisition system and method

    CN120165682A

  • Resolver signal converter and resolver signal conversion method

    US20120010849A1

Cited By

  • Low-concentration gas leakage detection method based on self-adaptive digital phase-locked amplification algorithm

    CN121594332A

  • Low-concentration gas leakage detection method based on adaptive digital phase-locked amplification algorithm

    CN121594332B