发明名称 |
Method of analog/digital conversion |
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.
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申请公布号 |
US4989005(A) |
申请公布日期 |
1991.01.29 |
申请号 |
US19880244552 |
申请日期 |
1988.09.12 |
申请人 |
HORIBA, LTD. |
发明人 |
WAKIYAMA, YOSHIHIRO;OHNISHI, YOSHIRO |
分类号 |
G01R19/04;H03M1/00;H03M1/54 |
主分类号 |
G01R19/04 |
代理机构 |
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主权项 |
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地址 |
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