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CN100583644C 一种积分式A/D转换方法及其模数转换装置 失效 - 权利终止

一种积分式A/D转换方法及其模数转换装置
摘要：
一种积分式A/D转换方法，包括对零点电压V0和标准电压Vb双向积分，获得计数值T0；对基准电压V1和标准电压Vb双向积分，获得计数值T1；对待转换电压Vx和标准电压Vb双向积分，获得计数值Tx；使用公式Vx＝(V1-V0)(Tx-T0)/(T1-T0)+V0计算待转换电压Vx的值。上述步骤中的双向积分包括下述步骤：对V0或V1或Vx进行正向定时积分，定时时间为积分电路输出电压过零时开始计算的固定时间Td；积分时间Td到，停止积分，开始采用标准电压Vb对积分器反向积分，同时计数器开始计数；当积分器输出电压过零时，产生触发信号，使计数器停止计数；对应于电压V0、V1或Vx分别获得计数值T0、T1或Tx。本发明还公开实现上述方法的A/D转换装置。
摘要（英）：

An integration type A/D converting method includes 11 ) making bidirectional integration to zero voltage V 0 and standard voltage Vb, obtaining count value T0, 12 ) making bidirectional integration to reference voltage V 1 and standard voltage Vb, obtaining count value T1, 13 ) making bidirectional integration to switching voltage Vx and standard voltage Vb, obtaining count value Tx, 14 using formulae Vx = ( V 1- 1- V 0 ) ( Tx - t 0 ) / ( t 1- 1- t 0 ) + V 0 to calculate switching voltage Vx value. Bidirectional integration in Above-mentioned steps includes following steps: 1, to proceed positive direction timing integration to 0 or V 1 or Vx, timing time being the fixed time Td when integrating circuit output voltage passing zero, 2, stopping integration when reaching integration time Td, beginning reversal integration to integrator adopting standard voltage Vb, at the same time counter beginning counting, 3, when integrator output voltage passing zero, generating triggering signal to stop counter counting, respectively obtaining count value T0, T1 or Tx corresponding to voltage V 0, V 1 or Vx. Said invention also discloses A/D converter to realize above-mentioned method.

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