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本文讨论的是用于300路群信号编码设备中的高速取样保持电路。取样频率为2.864MHz,取样间隔为349ns,取样时间为58.2ns。为此选定了适于高速工作的电压取样、电压保持、恒流直接驱动电路。经过调测,S/N达到60dB,驱动脉冲前后沿≤2ns。一、高速取样保持电路的确定每个取样值必须保持住一段时间,以供编码器作数字处理。储能器件(如电感、电容)可完成“保持”的作用,电感为电流保持,电容为电压保持。由于电感比电容体积大、损耗
This article discusses the high-speed sample-and-hold circuit used in 300 channel group signal encoding devices. Sampling frequency is 2.864MHz, sampling interval is 349ns, sampling time is 58.2ns. For this reason, the voltage sampling, voltage maintaining and constant current direct driving circuit suitable for high speed operation are selected. After commissioning, S / N reached 60dB, before and after the drive pulse ≤ 2ns. A high-speed sample and hold circuit to determine the value of each sample must be maintained for some time for the encoder for digital processing. Energy storage devices (such as inductors, capacitors) to complete the “hold” effect, the inductor current is maintained, the capacitor voltage is maintained. Inductance than the capacitor volume, loss