But it is hard to realize the dual-loop instantaneous control with digital scheme, because there is delay time of sampling and computing and lack of real-time regulation for digital control.
数字控制器存在采样与计算延时，实时控制性差，采用数字控制器实现双闭环瞬时值控制比较困难。
The use of phase-locked loop technology makes the sampling frequency synchronously follow the signal frequency and improves the calculation accuracy of sampling data.
运用锁相环技术使采样频率同步跟踪信号频率，提高采样数据计算的准确性。
The circuit is divided into full bridge module, charge sense amplifier module, correlated double sampling and holding module, closed-loop feedback module, low-pass filter and time controlling module.
检测电路分为全桥平衡模块、电荷放大器模块、信号放大模块、相关双采样模块、采样保持模块、闭环反馈模块、低通滤波模块和数字时序控制模块。
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