Phase lock loop frequency synthesizer with quick lock function

A frequency synthesizer and fast locking technology, which is applied in the automatic control of power and electrical components, etc., can solve problems such as limited loop locking time, disturbance of VCO voltage control line, loop gain or zero, and insufficient pole change. , to achieve the effect of low power consumption and simple structure

Inactive Publication Date: 2009-11-18
GUANGZHOU RUNXIN INFORMATION TECH
View PDF0 Cites 23 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of the acceleration mode is that when the loop is switched from the acceleration state to the normal mode state, the voltage control line of the VCO w

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Phase lock loop frequency synthesizer with quick lock function
  • Phase lock loop frequency synthesizer with quick lock function
  • Phase lock loop frequency synthesizer with quick lock function

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0016] Such as image 3 As shown, the phase-locked loop frequency synthesizer with fast locking function of the present invention includes a phase-locked loop 101 and a fast-locking logic unit 102, and the phase-locked loop 101 is composed of a frequency discriminator 501, a charge A pump 502, a voltage-controlled oscillator 503, a programmable multimode frequency divider 504, and a third-order passive lead-lag loop filter 511 are composed, and one input terminal of the frequency and phase detector 501 is connected to a reference frequency signal, The other input terminal is connected to the output terminal of the frequency divider 504, the output terminal of the frequency and phase detector 501 is connected to the input terminal of the charge pump 502, and the output terminal of the charge pump 502 is connected to the input terminal of the loop filter 511 , the output terminal of the loop filter 511 is connected to the input terminal of the voltage-controlled oscillator 503, ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a phase lock loop frequency synthesizer with quick lock function, comprising a phase lock loop (101) and a quick lock logic unit (102). The phase lock loop (101) consists of a frequency discrimination phase discriminator (501), a charge pump (502), a voltage control oscillator (503), a programmable multimode frequency divider (504) and a loop filter (511). The quick lock logic unit (102) consists of a logic control circuit (508), a unit gain follower (509) and a phase lock monitor (510). The invention realizes the quick lock of the frequency synthesizer, and the quick lock logic unit has simple structure and low power consumption. The invention is especially suitable for a wireless radio frequency communication system which requires low power consumption and quick lock.

Description

technical field [0001] The invention belongs to the technical field of electronic communication or radio frequency, and specifically refers to a phase-locked loop frequency synthesizer with fast locking function. Background technique: [0002] At present, the phase-locked loop frequency synthesizer is widely used in the fields of electronic communication and wireless radio frequency technology, and has become an indispensable module of modern wireless communication. In modern wireless radio frequency communications such as digital mobile systems that require fast locking of frequency synthesis, vehicle radio frequency receiving systems and frequency hopping systems, fast frequency synthesis is a very important indicator. Because fractional phase-locked loop frequency synthesis can provide large loop bandwidth while achieving narrow channel spacing, compared with integer phase-locked loop, it has the advantage of fast loop locking speed. No worse than integer frequency synth...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H03L7/18
Inventor 蔡飞陈红林
Owner GUANGZHOU RUNXIN INFORMATION TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap