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一种具有很高比特率的A/D转换器已经研制成功。其工作方式为串-并联型式,并且末级的输入相当于交流耦合。这一点是被输入信号的统计特性所允许的。该A/D转换器的样机具有下列性能:1)直流耦合模拟输入——能接收几乎所有的模拟信号以及电视信号;2)采样频率高达20兆赫;3)具有每次采样10比特的线性编码电路;4)线性误差小于量化电平的1/3;5)微分增益和微分相位分别为0.4%和0.25°;6)工作温度范围为0°～50℃。
A high-bit-rate A / D converter has been developed. The way it works is a string-parallel connection, and the final input is equivalent to AC-coupled. This is allowed by the statistical properties of the input signal. The A / D converter prototype has the following features: 1) DC-coupled analog input - can receive almost all of the analog and television signals; 2) sampling frequency up to 20 MHz; 3) with linear coding of 10 samples per sample Circuit; 4) the linearity error is less than 1/3 of the quantization level; 5) the differential gain and differential phase are 0.4% and 0.25 °, respectively; 6) the operating temperature range is 0 ° ~ 50 ° C.