Fractional frequency division frequency synthesizer with output signal phase synchronization and frequency modulation continuous wave functions

By designing a fractional frequency divider synthesizer with output signal phase synchronization and frequency-modulated continuous wave functions, the problem of inconsistent local oscillator signal phase in multi-chip splicing systems was solved, achieving high-precision phase synchronization and signal synchronization, and improving the communication and radar performance of the integrated sensing system.

CN121864089APending Publication Date: 2026-04-14NANJING UNIV OF POSTS & TELECOMM
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Patent Information

Application Number
CN202512053787.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-31
Publication Date
2026-04-14

AI Technical Summary

Technical Problem

In a multi-chip integrated sensing system, it is difficult to keep the phase of the local oscillator signal inside each chip consistent, which affects the beamforming effect and the reliability of target perception. Existing fractional frequency synthesizers in high-precision pulse radar have problems such as minimum detection range blind zone, insensitivity to low-speed targets, and general anti-interference capability.

Method used

A fractional frequency synthesizer with output signal phase synchronization and frequency-modulated continuous wave (FM-CWHW) function was designed. By sharing modules and using a phase difference detection circuit, phase synchronization of multiple fractional frequency synthesizers was achieved. FM-CWHW ...

Benefits of technology

It achieves phase consistency of the output signals of multiple fractional frequency dividers, improves the communication performance and radar detection accuracy of the integrated sensing system, reduces system power consumption and area cost, overcomes the disadvantages of radar, and provides high-precision phase synchronization and signal synchronization functions.

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Abstract

The invention discloses a fractional frequency division frequency synthesizer with output signal phase synchronization and frequency modulation continuous wave functions, and the basic structure is a charge pump phase-locked loop. Comprising a phase frequency detector, a first charge pump, a second charge pump, a low-pass filter, a voltage-controlled oscillator, a first buffer, a second buffer, a two-frequency divider chain, an IQ undersampling circuit, a local oscillator generator, a programmable multimode frequency divider, a Delta-Sigma modulator (DSM), a first selector, a second selector, a third selector, a tracking phase accumulator, a numerical control oscillator, an accumulation phase difference register and an atan2 logic circuit. The device comprises a main phase control circuit, a phase adjusting circuit, an enabling control circuit, a waveform generator and a serial peripheral interface. The decimal frequency-division frequency synthesizer can be applied to a general-inductance integrated system, ensures that output signals provided by a plurality of decimal frequency-division frequency synthesizers are consistent in phase in a multi-channel radio frequency transceiving system adopting a multi-chip splicing mode, and can also be applied to the general-inductance integrated system as a sensing signal source; and the speed and the distance of an object can be quickly sensed by the high linearity and the quick chirp capability of an output signal. The decimal frequency division frequency synthesizer is applied to a linear frequency modulation continuous wave radar system, initial phase synchronization can be carried out firstly, then frequency continuous modulation is carried out, and measurement errors can be eliminated. In view of functional similarity of partial modules of the synchronous loop and the FMCW loop, such as a phase frequency detector, a charge pump, a voltage-controlled oscillator and the like, the modules can be shared, so that the power consumption and area cost of the system are remarkably reduced.
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