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本文介绍最近研制成功的高比特率 A/D 转换器,它采用串——并型方案,最后一级 A/D 输入相当于交流耦合,这是输入信号的统计特性所允许的。该 A/D 转换器具有如下特点:(1)直流耦合模拟输入——能接收几乎所有的模拟信号和电视信号。(2)最高采样频率为20兆赫。(3)采用每次采样为10位的线性编码方案。(4)线性误差小于1/3量化电平。(5)增益差为0.4%,相位差为0.25°。(6)工作温度范围0～50℃。
This article describes the recently developed high-bit-rate A / D converter that uses a string-and-parallel scheme with the final stage A / D input equivalent to AC-coupled, as allowed by the statistical characteristics of the input signal. The A / D converter has the following characteristics: (1) DC-coupled analog input - can receive almost all of the analog signals and television signals. (2) The maximum sampling frequency is 20 MHz. (3) using a linear coding scheme of 10 bits per sample. (4) linear error less than 1/3 quantization level. (5) The gain difference is 0.4%, the phase difference is 0.25 °. (6) Operating temperature range 0 ~ 50 ℃.