Frequency band switching method and frequency band switching system for phase-locked loop

一种切换系统、锁相环的技术，应用在电子领域，能够解决锁相环频带调整时间长、频带切换速度慢等问题，达到节省频带切换时间、提高频带切换速度的效果

Active Publication Date: 2012-04-04
CHINA CORE FUTURE MICROELECTRONICS TECH CHENGDU CO LTD
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems such as the long frequency band adjustment time of the existing phase-locked loop and the slow frequency band switching speed, the present invention provides a frequency band switching method for the phase-locked loop, the method comprising:

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Embodiment Construction

[0034] In order to deeply understand the present invention, the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0035] The present invention first checks the count value of the center frequency band within a specified time under a fixed control voltage, compares it with the count value of the expected frequency, and takes out the difference; The error corresponds to ideally spaced frequency bands, thereby realizing fast and accurate switching of frequency bands, shortening the start-up time of the phase-locked loop, reducing the start-up power consumption, and can be widely used in wide-band transceiver systems.

[0036] see Figure 6 and Figure 7 , the embodiment of the present invention provides a frequency band switching method for a phase-locked loop, the method comprising the following steps:

[0037] Step 101: After the high level of the start signal arrives, the frequency band switching cir...

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Abstract

The invention discloses a frequency band switching method and a frequency band switching system for a phase-locked loop, and the frequency band switching method and the frequency band switching system belong to the technical field of electronics. The frequency band switching method comprises the steps of judging a size relationship between a count value of a current output frequency of a voltage-controller oscillator and a count value of an expected frequency and adjusting the current output frequency band according to the size relationship so as to determine an upper frequency band and a lower frequency band, frequencies of which have the minimal difference value with the expected frequency; and comparing the size of difference values between the count value of the expected frequency andcount values of the frequencies of the upper frequency band and the lower frequency band under a fixed voltage so as to determine the frequency band, the frequency of which has the minimal differencevalue with the expected frequency, as the switching frequency band, and switching the current output frequency band to the switching frequency band. The system comprises a rated time pulse generator,a counter and a logic controller. The frequency band of the voltage-controller oscillator is adjusted in place by one step by utilizing the difference between the count value of the expected frequency and the count value of the oscillation frequency of the central frequency band of the voltage-controller oscillator under the fixed control voltage, thereby saving the frequency band switching time and increasing the switching speed of the frequency band.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a frequency band switching method and system for a phase-locked loop. Background technique [0002] In the field of wireless communication, many systems are required to cover a wide frequency range, and the broadband phase-locked loop that can realize this requirement has become a key module of each communication system. In this wide-band application, if the phase-locked loop has no frequency band division, and the frequency switching is directly controlled by the control voltage, it will inevitably lead to a sharp increase in the gain of the voltage-controlled oscillator, which means that a small change in the control voltage will cause the oscillator The severe frequency jitter affects the stability and noise performance of the entire phase-locked loop. Therefore, the frequency range of the oscillator is generally divided into several sub-frequency bands that overlap each ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/18H03L7/099
Inventor 刘畅郭桂良杜占坤阎跃鹏
Owner CHINA CORE FUTURE MICROELECTRONICS TECH CHENGDU CO LTD
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