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锁相环有压控型与流控型两种，本文以电流型锁相环作为重点，研究电流型鉴相四阶微分控制数字锁相环的主要性能，提出了环路稳定的新条件，以便与一般压控型的同类型数字锁相环作比较，便于推广应用。
Phase-locked loop has two types of voltage-controlled and flow-controlled. In this paper, the current-mode phase-locked loop is taken as the key point to study the main performance of current-mode fourth-order differential control digital phase-locked loop. In order to be compared with the general type of voltage-controlled PLL for comparison, easy to promote the application.