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1. 发明授权

US5422643A High dynamic range digitizer 失效
标题翻译：高动态范围数字化仪
公开(公告)号：US5422643A
公开(公告)日：1995-06-06
申请号：US21435
申请日：1993-02-24
申请人： Ching Chu , Steven Prowse , John Haywood
发明人： Ching Chu , Steven Prowse , John Haywood
IPC分类号： G01M11/00 , H03M1/18
CPC分类号： G01M11/3145 , H03M1/187
摘要： A digitizer suitable for digitizing input signals having a high dynamic range. The digitizer is microprocessor controlled and comprises an input stage, a multi-channel attenuator or amplifier bank, a multiplexer and a analog-to-digital (A/D) converter. The function of the multi-channel bank is to move the input signal within the range of the A/D converter. The input signal to be digitized is fed through the input stage to each of the channels in the attenuator bank. The signal is scaled by each respective channel in the attenuator bank. The multiplexer is used to switch the scaled signal which is within the range of the A/D converter for digitizing. The digitized sample is then corrected according to the attenuation or gain factor of the scaled channel. The digitizer includes a comparator bank which is used to determine the channel with the widest signal range within the range of the A/D converter. The digitizer also includes a channel calibrator for calibrating the actual gain or attenuation of each channel. In another aspect, the digitizer can be implemented using an optical front-end comprising an optical beam splitter, optical attenuators and amplifier banks. The optical front-end provides improved noise immunity and faster speed of operation.
摘要翻译：适用于数字化具有高动态范围的输入信号的数字转换器。数字转换器由微处理器控制，包括输入级，多通道衰减器或放大器组，多路复用器和模拟（A / D）转换器。多通道组的功能是在A / D转换器的范围内移动输入信号。要被数字化的输入信号通过输入级馈送到衰减器组中的每个通道。信号由衰减器组中的每个相应通道进行缩放。多路复用器用于切换在A / D转换器范围内的缩放信号进行数字化。然后根据缩放的通道的衰减或增益因子校正数字化采样。数字转换器包括一个比较器组，用于确定A / D转换器范围内最宽信号范围的通道。数字转换器还包括用于校准每个通道的实际增益或衰减的通道校准器。在另一方面，可以使用包括光分束器，光衰减器和放大器组的光学前端来实现数字化仪。光学前端提供更好的抗噪声能力和更快的操作速度。

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