Low-jitter injection-locked phase-locked loop based on multiphase injection

Through multi-phase injection-locked phase-locked loop technology, the phase noise and jitter problems of the ring oscillator phase-locked loop in high-performance requirements are solved, and jitter reduction and noise suppression capabilities are improved. It is suitable for applications such as high-speed ADC/DAC sampling clocks and millimeter wave communications.

CN120639090AActive Publication Date: 2025-09-12NORTHWESTERN POLYTECHNICAL UNIV
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Patent Information

Application Number
CN202511107186.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-08-08
Publication Date
2025-09-12
Estimated Expiration
2045-08-08

AI Technical Summary

Technical Problem

The application of ring oscillator phase-locked loops in high-performance applications is limited by phase noise and jitter performance, making it difficult to meet the requirements of applications with stringent timing accuracy and noise, such as high-speed ADC/DAC sampling clocks and millimeter-wave communications.

Method used

A low-jitter injection-locked phase-locked loop based on multi-phase injection is adopted. Multi-phase injection signals and complementary injection signals are generated through the injection-locked path unit. Multi-phase direct injection and cross-coupled complementary injection are performed on the injection-locked ring oscillator to eliminate phase offset and improve noise suppression capability.

Benefits of technology

It effectively reduces the jitter of the ring oscillator phase-locked loop, improves the phase noise suppression capability, and expands the noise suppression bandwidth, making it suitable for application scenarios with wide tuning range and multi-phase output.

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Abstract

The invention relates to the technical field of radio frequency integrated circuits, and particularly provides a low-jitter injection locking phase-locked loop based on multiphase injection, which comprises an injection locking path unit, a locking unit and an injection locking ring oscillator, the injection locking path unit can generate a multi-phase injection signal and a complementary injection signal according to the received reference signal; the injection locking ring oscillator receives the multi-phase injection signal and the complementary injection signal and then generates an oscillation signal; and then the locking unit locks the injection locking phase-locked loop according to the generated oscillation signal. According to the invention, the injection locking path unit generates the multi-phase injection signal and the complementary injection signal, so that the injection locking ring oscillator is subjected to multi-phase direct injection and cross coupling complementary injection, and the multi-phase direct injection can reduce the jitter of the phase-locked loop based on the ring oscillator. And phase deviation generated by multi-phase direct injection is eliminated through cross coupling complementary injection, so that the injection intensity is further improved, and the noise suppression bandwidth is effectively expanded.
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