Power supply system for reducing low-frequency spurious signals of measuring instrument and phase compensation method

By using a three-level power supply loop system and a phase compensation algorithm, the interference problem of low-frequency spurious signals in precision measuring instruments is solved, and the effective suppression of low-frequency spurious signals and the improvement of signal recognition sensitivity are achieved.

CN121966255APending Publication Date: 2026-05-01CHINA ELECTRONIS TECH INSTR CO LTD
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Patent Information

Application Number
CN202512018431.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-30
Publication Date
2026-05-01

AI Technical Summary

Technical Problem

In precision measuring instruments, low-frequency stray signals cause the noise floor to rise and the number of stray signals to increase, affecting the reliability of measurement results and core indicators. Moreover, existing technologies are unable to effectively suppress its conducted and radiated interference.

Method used

A three-level power supply loop system is adopted, which combines frequency/phase adjustable external reference clock synchronization technology and phase compensation algorithm of multi-channel coherent clock output. By blocking the transmission path of low-frequency spurious signals and achieving incoherent cancellation, space radiation interference is reduced.

Benefits of technology

It effectively reduces the amount of low-frequency spurious signals, improves the spurious-free dynamic range and weak signal recognition sensitivity of the measuring instrument, and enhances the reliability of measurement results and production feasibility.

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Abstract

The invention belongs to the technical field of precision measurement, and particularly relates to a power supply system for reducing low-frequency spurious signals of a measuring instrument and a phase compensation method, which comprise three stages of power supply loops, the first stage is used for completing conversion of AC-DC (Alternating Current-Direct Current) DC bus voltage, and the second stage is used for completing conversion from the DC bus voltage to each path of required voltage and low-pass filtering. And in the third stage, active rate filtering of various power supplies is realized through the LDO, and the power supplies are output to each whole device for use. An innovative multi-channel coherent clock output phase compensation algorithm is used, each channel of clock output phase of an external reference clock synchronization circuit is optimized, clock phases of power supply conversion circuits are different, multi-channel same-frequency clock spurious signals and harmonic waves thereof are enabled to generate incoherent offset, and space radiation interference of low-frequency spurious signals is reduced.
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