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四、采样保持电路1.采样保持电路及有关参数在模拟通道中的采样保持电路如图4-1所示。采样保持电路通常由输入/输出缓冲放大器、逻辑电路控制的开关以及保持电容器组成。采样保持电路具有两种运行模式:采样与保持。在采样模式中,由逻辑输入控制的开关K是闭合的,输出随输入变化,通常增益为+1,A_1是高增益放大器,用以为电容器快速充电;在
Fourth, sample and hold circuit 1. Sample and hold circuit and related parameters in the analog channel in the sample and hold circuit shown in Figure 4-1. Sample-and-hold circuits typically consist of input / output buffer amplifiers, logic-controlled switches, and hold capacitors. Sample and hold circuits have two modes of operation: sample and hold. In sampling mode, the switch K controlled by the logic input is closed and the output varies with input. The gain is usually +1, A_1 is the high-gain amplifier used to quickly charge the capacitor, and at