The sample and hold circuit is employed by the bottom plate sampling technique, which could not only cancel the charge injection error but also eliminate the effect of clock feed-through.
采样保持电路设计采用了电容下极板采样技术，不仅有效地避免了电荷注入效应引起的采样信号失真，而且消除了时钟馈通效应的不良影响。
The basic unit structure of the SI is introduced in this paper. It also discusses the main factors which affects the precision of fault diagnosis and analyzes the charge injection error in detail.
介绍了开关电流电路的基本单元结构，讨论了影响故障诊断精度的主要因素，重点分析了电荷注入误差。
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