Phase-locked loop, microwave modem and phase jump suppressing method

Abstract

The invention discloses a phase-locked loop, a microwave modem and a phase jump suppressing method, belonging to the field of circuit control. The phase-locked loop comprises an error correcting module, a phase discriminator, a parameter selecting module, a time delay adjusting module, a filter and a control oscillator, wherein the parameter selecting module is used for selecting corresponding loop bandwidth parameters according to a current modulation mode; the time delay adjusting module is used for delaying the time for phase discriminator errors or the loop bandwidth parameters; and the filter is used for carrying out the filtering processing on the phase discriminator errors obtained by the phase discriminator according to the loop bandwidth parameters selected by the parameter selecting module. By selecting the loop bandwidth parameters according to the current modulation mode and carrying out time delay processing on the loop bandwidth parameters or the phase discriminator errors at the same time, the problem that the loop bandwidth parameters have response time delay when the modulation mode is changed is solved, and the effects of reducing the bit error ratio of the modern and reducing the risks on performance are achieved.

Description

technical field [0001] The invention relates to the field of circuit control, in particular to a phase-locked loop, a microwave modem and a phase jump suppression method. Background technique [0002] With the continuous development of communication and circuit control fields, many modems can support multiple modulation modes at the same time. When the modulation mode of the modem changes, it is necessary to change the corresponding circuit parameters accordingly to obtain optimal performance. [0003] Taking the microwave modem as an example, when the ODU (OutdoorUnit, outdoor unit) is subject to external stress (such as vibration, temperature change, etc.), the frequency of the signal it sends to the microwave modem will change in a short period of time. This sudden change is called For phase jump. [0004] The phase-jump suppression of the ODU by the microwave modem is mainly realized through a phase-locked loop. See figure 1 In the structure diagram of the phase lock...

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Problems solved by technology

[0008] In order to solve the problems in the prior art that the loop bandwidth parameter response is delayed when the modulation mode changes, the bit error rate of the modem is high, and there is a high risk in performance, the embodiment of the present invention provides a phase-locked loop, a microwave modem and a phase-locked loop. jump suppression method

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