Method for improving switching performance of phase-lockes loop's reference signal

A reference signal and switching performance technology, applied in the automatic control of power, electrical components, etc., can solve the problems of phase-locked loop loss of lock, input signal jump, etc.

Inactive Publication Date: 2005-02-16
EASTERN COMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, when the external reference signal is switched, for the PLL phase detector, the phase of the input signal has a large jump, and when the external reference signal switches frequently, it may even cause the phase-locked loop to lose lock.

Method used

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  • Method for improving switching performance of phase-lockes loop's reference signal
  • Method for improving switching performance of phase-lockes loop's reference signal
  • Method for improving switching performance of phase-lockes loop's reference signal

Examples

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Embodiment 1

[0019] With reference to accompanying drawing 1,2. The signal received by the phase-locked loop 1 is processed by the virtual reference module 2. The virtual reference module is composed of a selector 3, a phase compensator 4 and a phase detector 5. The selector receives the reference signal S 1 , S 2 , the phase detector also receives the reference signal S 1 , S 2 And calculate the phase difference between the reference signals, and record the phase difference result in the phase detector memory, the phase compensator reads the phase difference and records it in its memory, it also includes the following steps:

[0020] 1), the selector and the phase compensator read the reference selection control signal value sent by the digital loop filter controller 7 in the phase-locked loop from the control circuit, and store it in its memory respectively;

[0021] 2) When the system is just powered on, the reference selection control signal value is the initial state, the selector ...

Embodiment 2

[0028] With reference to accompanying drawing 1,2. The phase compensator reading the phase difference means that the phase compensator reads the phase difference when the phase difference changes. All the other are with embodiment 1.

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Abstract

The invention discloses a method for improving switching performance of a reference signal of phase locked loop. Virtual refernece module processes the signal received. The virtual reference module is composed of a selector, a phase compensator and a phase discriminator. The selector receives a reference signal and outputs a reference signal, based on the value of the reference selection control signal. The phase discriminator also receives a signal and calculates a difference value of phase between reference signals. The phase compensator receives the value of the reference selection control signal and the reference signal output by the selector, and outputs the reference signal with the phase being compensated. Even through the reference signal is switched frequency the frequency and phase of the signal inputted to the phase locked loop are kept stabilization all the time.

Description

technical field [0001] The invention relates to the field of signal processing in digital communications. Background technique [0002] When the phase-locked loop is applied to digital communication equipment, there are often two external reference signals. These two external reference signals are sent to the external standard selector of the phase-locked loop, and the selector selects one of them and sends it to the phase detector of the phase-locked loop. Can improve the reliability of the system. But it also brings another problem, because the two external reference signals generally have the same frequency but the phase difference is random. In this way, when the external reference signal is switched, for the PLL phase detector, the phase of the input signal has a large jump, and when the external reference signal switches frequently, it may even cause the phase-locked loop to lose lock. This problem is a more serious problem in the communicatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03L7/08
Inventor 龚一航成晓雄周巍叶建武
Owner EASTERN COMM
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