A phase-locked loop frequency synthesizer and frequency control method

A frequency synthesizer, phase-locked loop technology, applied in the direction of automatic power control, electrical components, etc., can solve the problems of long locking time, occupying locking time, etc., to achieve the effect of high frequency adjustment accuracy and reduced power consumption

Active Publication Date: 2019-05-21
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the locking process of the frequency synthesizer, the rough frequency adjustment process of AFC takes up most of the locking time, so there is a shortcoming of long locking time in the prior art

Method used

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  • A phase-locked loop frequency synthesizer and frequency control method
  • A phase-locked loop frequency synthesizer and frequency control method
  • A phase-locked loop frequency synthesizer and frequency control method

Examples

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Embodiment Construction

[0052] Various exemplary embodiments, features, and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. The same reference numbers in the figures indicate functionally identical or similar elements. While various aspects of the embodiments are shown in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

[0053] The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as superior or better than other embodiments.

[0054] In addition, in order to better illustrate the present disclosure, numerous specific details are given in the following specific implementation manners. It will be understood by those skilled in the art that the present disclosure may be practiced without some of the specific details. In some instances, methods, means, componen...

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Abstract

The invention provides a phase-locked loop frequency synthesizer and a frequency control method. The phase-locked loop frequency synthesizer comprises a control code generation module which is configured to generate a first control code corresponding to a received first signal based on a preset corresponding relationship, wherein the preset corresponding relationship comprises a corresponding relationship between signal frequencies and control codes; and a phase-locked loop which is configured to carry out signal frequency locking operation based on the first control code. A frequency of a second signal output after the locking operation is carried out is the same as the frequency of the first signal. The phase-locked loop comprises a voltage-controlled oscillator. The control code generation module is connected with a switched capacitor array in the voltage-controlled oscillator. A capacitive reactance value of the switched capacitor array is adjusted through utilization of the firstcontrol code. The embodiment of the invention has the technical effect of simple structure and short locking time.

Description

technical field [0001] The disclosure relates to the fields of communication and integrated circuits, in particular to a phase-locked loop frequency synthesizer and a frequency control method. Background technique [0002] The digital electronic system needs a clock reference to provide a time reference for the entire electronic system. The wireless communication system needs the frequency conversion of the local oscillator signal to realize the transmission and reception of the wireless communication signal. The phase-locked loop frequency synthesizer provides the above-mentioned time reference and the local oscillator signal. Commonly used modules, the performance of the phase-locked loop frequency synthesizer has a great influence on the digital electronic system and wireless communication system, and the lock time is one of the key indicators of the phase-locked loop frequency synthesizer. [0003] In the prior art, the locking time of the phase-locked loop frequency syn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03L7/099H03L7/187
CPCH03L7/0992H03L7/187
Inventor 康钦淼谢之峰周明
Owner TSINGHUA UNIV
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