专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

2. 发明授权

US4989005A Method of analog/digital conversion 失效
标题翻译：模拟/数字转换方法
公开(公告)号：US4989005A
公开(公告)日：1991-01-29
申请号：US244552
申请日：1988-09-12
申请人： Yoshihiro Wakiyama , Yoshiro Ohnishi
发明人： Yoshihiro Wakiyama , Yoshiro Ohnishi
IPC分类号： G01R19/04 , H03M1/00 , H03M1/54
CPC分类号： H03M1/0602 , H03K5/1532 , H03M1/54
摘要： An analog/digital converter includes a peak holding circuit for holding a peak voltage of input analog data and a peak time detecting circuit for detecting a point of time when the input analog data reaches a peak voltage. Also included is a constant current discharging circuit for discharging the peak voltage held in the peak holding circuit at a constant current from the peak point of time detected by the peak time detecting circuit. The converter also includes a zero time detecting circuit for detecting a zero point of time when a voltage held in the peak holding circuit is reduced to zero and a time to digital converting circuit for counting a number of pulses in a pulse line obtained by gating clock pulses during a period of time from the peak time detected by the peak detecting circuit to the zero time detected by the zero time detecting circuit, the time to digital converting including a counter to output digital data corresponding to the input analog data. A positive offset analog voltage is added to the input analog data and a digital compensator compensates the digital data obtained by the time to digital converting circuit by providing a negative offset digital value approximately corresponding to the positive offset analog voltage, more correctly, equal to a number of pulses in a pulse line passing through a clock gate of the time-to-digital converting circuit for a period of time during which the input analog data has a value equal to zero.
摘要翻译：模拟/数字转换器包括用于保持输入模拟数据的峰值电压的峰值保持电路和用于检测输入模拟数据达到峰值电压的时间点的峰值时间检测电路。还包括一个恒定电流放电电路，用于从峰值时间检测电路检测到的峰值时间点以恒定电流放电保持在峰值保持电路中的峰值电压。该转换器还包括一个零时间检测电路，用于在保持在峰值保持电路中的电压降至零时检测零点时间;以及时间到数字转换电路，用于对通过选通时钟获得的脉冲线中的脉冲数进行计数在从由峰值检测电路检测到的峰值时间到由零时间检测电路检测到的零时间的时间段内的脉冲，包括计数器的数字转换时间对应于输入的模拟数据的输出数字数据。正偏移模拟电压被添加到输入模拟数据，数字补偿器通过提供大致对应于正偏移模拟电压的负偏移数字值来补偿由数字转换电路获得的数字数据，更正确地等于a 通过时间数字转换电路的时钟门的脉冲线中的脉冲数，其中输入模拟数据具有等于零的时间段。

IPRDB

热门服务

关于我们

友情链接

联系方式