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1. 发明授权

US4308524A Fast high resolution predictive analog-to-digital converter with error correction 失效
标题翻译：具有纠错功能的快速高分辨率预测模数转换器
公开(公告)号：US4308524A
公开(公告)日：1981-12-29
申请号：US45793
申请日：1979-06-05
申请人： William D. Harrison , Henry H. Martin
发明人： William D. Harrison , Henry H. Martin
IPC分类号： H03M1/10 , H03M1/00 , H03K13/02
CPC分类号： H03M1/40 , H03M1/46
摘要： An analog-to-digital conversion system uses a fast analog-to-digital converter having a resolution less than the system resolution to convert the difference between a previously predicted value and the current analog value. The converted difference is summed with the predicted value to compute the actual value of the analog input signal to a resolution greater than that of the fast analog-to-digital converter. The high resolution digital value thus obtained becomes the predicted value for the next conversion. This predicted value is converted by a digital-to-analog converter having the same accuracy but not the same resolution as the system output to an analog signal which is compared with the input analog signal to obtain a difference signal. This difference signal is sampled and held to provide the input to the fast analog-to-digital converter. The system includes a gain scaling and switching circuit to compensate for errors which would occur when the difference between the true analog input and the prediction exceeds the range of the low resolution, fast analog-to-digital converter.
摘要翻译：模数转换系统使用具有小于系统分辨率的分辨率的快速模数转换器来转换先前预测值和当前模拟值之间的差值。转换的差值与预测值相加，以将模拟输入信号的实际值计算为高于快速模数转换器的分辨率。这样获得的高分辨率数字值成为下一转换的预测值。该预测值由具有与输入模拟信号相比较的系统输出相同的精度但不同分辨率的数模转换器转换，以获得差分信号。该差分信号被采样和保持以向快速模数转换器提供输入。该系统包括增益缩放和切换电路，以补偿当真实模拟输入和预测之间的差超过低分辨率，快速模数转换器的范围时将发生的错误。

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