Phase-locked loop automatic calibration method

Abstract

The present invention provides a phase-locked loop automatic calibration method. A phase-locked loop comprises a phase discriminator, an integrating circuit, a switch, a voltage controlled oscillator (VCO), a frequency divider, a field programmable gate array (FPGA) and a VCO preset digital analog converter (DA). The method comprises the steps of firstly outputting a frequency via the frequency divider, and roughly calibrating the phase-locked loop to lock the phase-locked loop successfully; then accurately calibrating the phase-locked loop by a phase-locked loop integral error voltage. The phase-locked loop automatic calibration method of the present invention realizes the accurate and rapid automatic calibration on the condition of not needing any artificial debugging.

Description

technical field [0001] The invention relates to the technical field of testing, in particular to an automatic calibration method for a phase-locked loop. Background technique [0002] Phase-locked loops are commonly used due to their excellent performance, relative simplicity, and low cost. With the advancement of technology and the needs of use, while optimizing the single sideband noise, the frequency of using the phase-locked loop VCO has become higher and higher. [0003] Due to the performance of the phase-locked loop, its preset voltage is not linear in its operating frequency, and the manual calibration of the traditional phase-locked loop preset calibration is very time-consuming. For example, for a phase-locked loop of 3GHz to 6GHz, a preset value needs to be set every 100MHz, and a phase-locked loop needs 31 parameters. If each parameter takes 30s, the entire preset debugging takes 930s, and debugging is very time-consuming. Moreover, during mass production, due ...

AI Technical Summary

Problems solved by technology

[0013] (2) Manual VCO preset debugging is required

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