High-reliability phase-locked loop module and switching method of output clock of phase-locked loop module

Abstract

A high-reliability phase-locked loop module comprises a phase-locked loop unit, a phase-locked loop monitoring unit and a clock switching unit, the phase-locked loop unit is connected to the phase-locked loop monitoring unit, and the output of the phase-locked loop monitoring unit and the output of the phase-locked loop unit are respectively connected to the clock switching unit. The phase-lockedloop monitoring unit is used for monitoring the working state or parameters of the phase-locked loop unit, and the clock switching unit is used for switching the output clock of the phase-locked loopmodule according to the monitoring result of the phase-locked loop monitoring unit. According to the technical scheme, automatic switching of the output clock of the phase-locked loop can be achieved,power consumption is reduced, cost is saved, the problems of system faults, breakdown and the like caused by phase-locked loop unlocking and jittering of the input reference clock of the phase-lockedloop can be avoided, and the stability and reliability of the system are greatly improved.

Description

technical field [0001] The present application relates to the technical field of electronic circuits, and in particular to a high-reliability phase-locked loop module and a corresponding clock switching method capable of realizing an automatic clock switching function. Background technique [0002] A phase-locked loop is a feedback control circuit, called a phase-locked loop (Phase-Locked Loop, PLL for short). It uses an externally input reference signal to control the frequency and phase of the internal oscillation signal of the loop. In the process of processing electronic signals, because the phase-locked loop can automatically track the frequency of the output signal to the frequency of the input signal, the phase-locked loop is usually widely used in closed-loop tracking circuits. In the field of clocks, clock phase-locked loops are widely used in clock generation. [0003] In the prior art, the phase-locked loop usually includes a frequency divider, a phase detector,...

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Problems solved by technology

[0008] In view of this, this application provides a high-reliability phase-locked loop module that can realize automatic clock switching. The main purpose is to solve the problems in the current prior art that the phase-locked Problems such as system failures and crashes that occur when the reference clock jitters, as well as problems such as cumbersome switching steps, high power consumption, and high cost

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