Laser driver circuit, method, system and electronic device under modulation depth variation

By using a cascaded control architecture of low-speed precision digital-to-analog converters and high-speed digital-to-analog converters, combined with a transimpedance conversion circuit and a nonlinear predistortion compensation module, the laser drive circuit is dynamically adjusted, solving the noise degradation problem of frequency-modulated continuous wave lidar systems at varying modulation depths. This improves the signal-to-noise ratio and beat frequency signal quality, meeting the requirements for high-precision detection in multiple scenarios.

CN122638832APending Publication Date: 2026-08-25BEIJING MORELITE SEMICON TECH CO LTD
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Patent Information

Application Number
CN202610651217.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-05-12
Publication Date
2026-08-25

AI Technical Summary

Technical Problem

Existing frequency-modulated continuous wave lidar systems suffer from noise degradation at varying modulation depths, resulting in a poorer signal-to-noise ratio and making it difficult to meet the needs of high-precision detection in multiple scenarios.

Method used

A cascaded control architecture of low-speed precision digital-to-analog converter and high-speed digital-to-analog converter is adopted, combined with transimpedance conversion circuit and nonlinear predistortion compensation module, to dynamically adjust the full-scale output current and digital waveform code stream, ensuring system linewidth consistency and noise optimization under different modulation depths.

Benefits of technology

The noise of the laser driving circuit was optimized under different modulation depths, which improved the signal-to-noise ratio and beat frequency signal quality of the system and met the needs of high-precision detection in multiple scenarios.

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Abstract

The application belongs to the technical field of laser radar, and discloses a laser driver circuit, method, system and electronic equipment under variable modulation depth. The circuit comprises a low-speed precision digital-to-analog converter for detecting a modulation depth mode and generating a corresponding analog setting signal; a high-speed digital-to-analog converter, an input end of which receives a full-range digital waveform code stream and dynamically configures a full-range output current according to the analog setting signal; and a transimpedance conversion circuit, a transimpedance resistance value of which is fixedly set and used for converting a modulation current signal into a voltage signal to drive a subsequent laser. When switching to a smaller modulation depth mode, the analog setting signal is reduced to reduce the full-range output current, and the high-speed digital-to-analog converter receives the full-range digital code stream. The application can reduce the driving amplitude, suppress the analog current noise of the voltage drop source, stabilize the quantization accuracy, eliminate the double penalty effect, and improve the beat signal quality under the small modulation depth mode.
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