CN-122001370-A - Dual-mode broadband phase-locked loop and frequency chain configuration method thereof

CN122001370ACN 122001370 ACN122001370 ACN 122001370ACN-122001370-A

Abstract

The invention provides a dual-mode broadband phase-locked loop and a frequency chain configuration method thereof, which relate to the technical field of radio frequency integrated circuits and comprise a voltage-controlled oscillator for generating an oscillating signal in a fundamental frequency range, a frequency multiplication output path comprising an output frequency multiplier for multiplying the oscillating signal to a high frequency range, a frequency division output path comprising an output frequency divider for dividing the oscillating signal to a low frequency range, a feedback link comprising a frequency divider for outputting the oscillating signal to a phase frequency detector, wherein an output end of the phase frequency detector is connected to a control end of the voltage-controlled oscillator through a charge pump and a loop filter, and a control module is used for enabling different output paths through register programming. In the communication mode, the frequency divider is controlled to divide the frequency by the decimal through the sigma-delta modulator so as to improve the phase noise performance, and in the radar mode, the frequency multiplication output path is started to generate millimeter wave signals. The invention can cover the wide-band output of 10MHz to 50GHz, realize dual-mode rapid switching and accurate control, and is suitable for various application scenes such as communication, radar and the like.

Inventors

ZHANG YUANYI
LIN CHENGZHI

Assignees

厦门润积集成电路技术有限公司

Dates

Publication Date: 20260508
Application Date: 20260116

Claims (9)

1. A dual mode wideband phase locked loop comprising A voltage-controlled oscillator for generating an oscillation signal in a fundamental frequency range; A frequency multiplication output path comprising at least one output frequency multiplier for multiplying the oscillation signal to a high frequency band; a frequency division output path including an output frequency divider for dividing the oscillation signal to a low frequency band; The input end of the feedback link is connected with the output end of the voltage-controlled oscillator and sequentially comprises a prescaler and a frequency divider, the output end of the frequency divider is connected to a phase frequency detector, the other input end of the phase frequency detector receives a reference signal, and the output end of the phase frequency detector is connected to the control end of the voltage-controlled oscillator through a charge pump and a loop filter to form a phase-locked closed loop; A control module electrically connected with the frequency multiplication output path, the frequency division output path and the frequency divider for switching between a communication mode and a radar mode, wherein, In the communication mode, enabling the divided output path and controlling the frequency divider to operate in a fractional division state controlled by a sigma-delta modulator; in the radar mode, the frequency doubled output path is enabled.
2. The dual-mode wideband phase-locked loop of claim 1, wherein the fundamental frequency range of the voltage-controlled oscillator is divided into a plurality of operating frequency bands, and boundaries of adjacent operating frequency bands overlap according to a preset ratio to form a preset threshold interval; the selection of the operating frequency band is controlled by a register of the control module to adapt the target frequency ranges of the different output paths.
3. A dual mode wideband phase locked loop as claimed in claim 2 wherein said switching of said operating frequency band is determined by a divide ratio, said voltage controlled oscillator being triggered to switch to an adjacent said operating frequency band when a fundamental frequency of said voltage controlled oscillator calculated from said divide ratio enters said predetermined threshold interval.
4. A dual mode wideband phase locked loop as claimed in claim 1 wherein said frequency doubled output path comprises: The first frequency doubling output branch is used for doubling the frequency of the oscillating signal of 4-8GHz to 8-16GHz; the second frequency multiplication output branch is used for multiplying the frequency of the oscillating signal of 4-8GHz to 16-32GHz; A third frequency doubling output branch for doubling the frequency of the oscillating signal of 16-25GHz to 32-50GHz; the output end of the output path is provided with a buffer amplifier.
5. The dual-mode wideband phase-locked loop of claim 4, wherein said frequency-doubled output path comprises a plurality of said output frequency multipliers, said plurality of output frequency multipliers being individually enabled by a control module or being cascaded in a predetermined connection to generate millimeter wave output signals of different frequency bands, said millimeter wave output signals comprising a continuous wave signal and a frequency modulated continuous wave signal.
6. The dual-mode wideband phase-locked loop of claim 1, wherein the output frequency division ratio is in a range of 2 0 ~2 9 , generating a low-band output signal in a range of 10 mhz-8 ghz.
7. The dual-mode wideband phase-locked loop of claim 1, wherein said sigma-delta modulator comprises a noise shaping unit for suppressing in-band quantization noise and a frequency division control unit for outputting a corresponding fractional frequency division control signal to enhance in-band phase noise performance in communication mode.
8. The dual-mode wideband phase-locked loop of claim 1, wherein the loop filter is a second-order RC network disposed at the input of the voltage-controlled oscillator.
9. A frequency chain configuration method applied to a dual-mode broadband phase-locked loop as claimed in any one of claims 1 to 8, comprising the steps of: s1, receiving a target output frequency and a working mode instruction; s2, determining a frequency division ratio according to the frequency of the reference signal, and calculating the fundamental frequency of the voltage-controlled oscillator according to the frequency division ratio; S3, configuring an operating frequency band of the voltage-controlled oscillator by a control module, wherein when the calculated fundamental frequency enters an overlapping interval of adjacent operating frequency bands, the voltage-controlled oscillator is triggered to switch to the adjacent operating frequency bands; S4, setting the frequency division ratio of the frequency divider through a control module; S5, selecting an output path according to the working mode: Enabling a frequency division output path in a communication mode, and configuring an output frequency division ratio to generate a 10MHz-8GHz signal; Enabling a frequency multiplication output path in a radar mode, and enabling a frequency multiplication branch to generate 8-50GHz signals; S6, comparing the phase of the reference signal with the phase of the feedback signal through the phase frequency detector, driving the charge pump to adjust the control end of the voltage-controlled oscillator through the loop filter until the locking criterion is met, and outputting the target frequency signal.

Description

Dual-mode broadband phase-locked loop and frequency chain configuration method thereof Technical Field The invention relates to the technical field of radio frequency integrated circuits, in particular to a dual-mode broadband phase-locked loop and a frequency chain configuration method thereof. Background A phase locked loop (PLL, phase Locked Loop) is a closed loop frequency control system with phase comparison as a core, and is widely used in the fields of communication, radar, measuring instruments, etc. The basic principle is that the phase difference between the reference signal and the feedback signal is compared by the phase frequency detector, and the comparison result is used for adjusting the control voltage of the voltage-controlled oscillator through the charge pump and the loop filter, so that the locking of the frequency of the output signal and the reference signal is realized. In a broadband application scenario, the PLL system needs to cover a wide frequency output from low frequency to millimeter wave. For example, in the communication field, the low frequency band is often used for baseband or intermediate frequency signal processing, and in the millimeter wave radar field, the high frequency band is used for distance and speed detection. However, existing wideband phase-locked loop architectures often face the following problems: 1. the coverage of a single output path is limited, that is, a conventional wideband PLL system generally adopts a single output path, and although the output range can be expanded by switching the frequency division ratio or the frequency multiplication multiple, it is difficult to consider the output quality and efficiency of low frequency and high frequency in an extremely wide frequency band. 2. In the existing wideband phase-locked loop design, the voltage-controlled oscillator generally realizes large-range frequency coverage by switching the working frequency band, and under the condition of approaching the frequency band boundary, the switching operation often needs to be locked again, so that the locking time is prolonged, and the frequency switching efficiency is affected. In summary, when the existing wideband phase-locked loop architecture meets the frequency coverage requirement of multiple application scenarios, the existing wideband phase-locked loop architecture still has the problems of single output architecture, low switching efficiency between different frequency bands, easiness in influence of device characteristics and environmental changes, and the like, and limits the response speed, the stability of output signals and the overall performance of the system in the application of crossing a large-range frequency output and needing rapid and stable switching. Disclosure of Invention In order to overcome the defects of the prior art, the technical problem to be solved by the invention is to provide a dual-mode broadband phase-locked loop and a frequency chain configuration method thereof, which adopts the following technical scheme: one aspect of the present invention provides a dual mode wideband phase locked loop comprising A voltage-controlled oscillator for generating an oscillation signal in a fundamental frequency range; The frequency multiplication output path comprises at least one output frequency multiplier and is used for multiplying the oscillation signal to a high frequency band; the frequency division output path comprises an output frequency divider, which is used for dividing the oscillation signal into a low frequency band; The input end of the feedback link is connected with the output end of the voltage-controlled oscillator and sequentially comprises a prescaler and a frequency divider, the output end of the frequency divider is connected to a phase frequency detector, the other input end of the phase frequency detector receives a reference signal, and the output end of the phase frequency detector is connected with the control end of the voltage-controlled oscillator through a charge pump and a loop filter to form a phase-locked closed loop; a control module electrically connected with the frequency multiplication output path, the frequency division output path and the frequency divider and used for switching between a communication mode and a radar mode, wherein, In the communication mode, enabling the divided output path and controlling the divider to operate in a fractional division state controlled by the sigma-delta modulator; In the radar mode, the frequency doubling output path is enabled. Further improved, the fundamental frequency range of the voltage-controlled oscillator is divided into a plurality of working frequency bands, and the boundaries of the adjacent working frequency bands are overlapped according to a preset proportion to form a preset threshold interval; the selection of the operating frequency band is controlled by a register of the control module to adapt to the target frequency ranges of the di