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Sweep frequency phase-locked loop system based on positive and negative alternating frequency sweep mechanism

A positive and negative alternating, phase-locked loop technology, applied in the field of phase-locked loop, to achieve the effect of wide frequency sweep range

Pending Publication Date: 2022-02-11
CHINA ELECTRONIC TECH GRP CORP NO 38 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is: how to make the phase-locked loop system not only achieve low phase noise, but also realize a wider frequency sweep range under low power supply voltage conditions, and provide a positive and negative alternate frequency sweep mechanism frequency-sweeping phase-locked loop system

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  • Sweep frequency phase-locked loop system based on positive and negative alternating frequency sweep mechanism
  • Sweep frequency phase-locked loop system based on positive and negative alternating frequency sweep mechanism
  • Sweep frequency phase-locked loop system based on positive and negative alternating frequency sweep mechanism

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Embodiment Construction

[0019] The embodiments of the present invention are described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following implementation example.

[0020] It is found that if the gain of the voltage-controlled oscillation in the phase-locked loop (K VCO ) is small, the phase noise of the oscillator is small, and the loop bandwidth is narrow, so that when it is applied to a phase-locked loop, it can effectively filter out the noise of other components in the phase-locked loop, so that the total noise of the phase-locked loop If the gain of the oscillator in the phase-locked loop is large, the loop bandwidth of the oscillator is wide, and the corresponding phase noise is also large, so that when applied to the phase-locked loop, the phase-locked loop can be obta...

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Abstract

The invention discloses a sweep frequency phase-locked loop system based on a positive and negative alternating frequency sweep mechanism, which belongs to the technical field of phase-locked loops, and comprises a numerical control switching module, a phase frequency detector, a charge pump, a loop filter, an oscillator and a frequency divider, wherein the first input end of the numerical control switching module is the input end of the phase-locked loop, the second input end of the numerical control switching module is connected with the output end of the frequency divider, the output end of the numerical control switching module is connected with the input end of the phase frequency detector, the output end of the phase frequency detector is connected with the input end of the charge pump, and the output end of the charge pump is connected with the loop filter. According to the invention, positive and negative alternating frequency sweeping is switched through the digital signal Control, a wide frequency sweeping range is realized with a low KVCO value, the problem of wide frequency sweeping range is solved in an advanced CMOS process with low power supply voltage, and the system is worthy of popularization and application.

Description

technical field [0001] The invention relates to the technical field of phase-locked loops, in particular to a frequency-sweeping phase-locked loop system based on a positive-negative alternating frequency-sweeping mechanism. Background technique [0002] In radar and wireless communication systems, a phase-locked loop (PLL, Phase Locked Loop) is a system frequency and clock generator, and its performance has a decisive impact on the entire system. In specific applications, different systems or application scenarios have different requirements for the performance indicators of the phase-locked loop. [0003] The performance index of the frequency-sweeping phase-locked loop system used in the automotive radar system is relatively high: low phase noise, wide loop bandwidth to support frequency scanning speed, and wide frequency range. Among them, low phase noise, wide loop bandwidth, and frequency sweep range are mutually contradictory, and this contradiction is more prominent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/085H03L7/093H03L7/099H03L7/18
CPCH03L7/085H03L7/093H03L7/099H03L7/18
Inventor 余斌万祝娟刘明杰李巍刘建
Owner CHINA ELECTRONIC TECH GRP CORP NO 38 RES INST