first-order loop 一阶环路

second order loop 二阶环路

high-order loop 高阶环路

high order loop 高阶环

second-order loop 二阶环路

third order loop 三阶回路

first-order phase-locked loop 一阶锁相环

Work Order Closed Loop 工单闭环

first order inertial loop 一阶惯性环节

third-order digital loop filter 三阶数字环路滤波器