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Method of analog/digital conversion
| Details |
Inventors: Wakiyama, Yoshihiro; Ohnishi, Yoshiro;
Assignee: Horiba, Ltd. (Kyoto, JP)
Primary Examiner: Shoop, Jr.; William M.
Assistant Examiner: Hoff; Marc S.
Attorney, Agent or Firm: Wenderoth, Lind & Ponack
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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DETAILED DESCRIPTION The present invention was achieved in view of the above described actual state an it is and object of the present invention to provide a method of conversion for an analog/digital converter provided with means for sufficiently compensating for the deterioration in the accuracy of conversion due to nonlinear portion which is directly generated after the start of the constant-current discharge as mentioned above in spite of a relatively simple construction.
In order to achieve the above described object, an analog/digital converter according to the method of the present invention having a basic construction as described above includes a means for generating a positive offset analog voltage to be added to input analog data and a digital compensating means for compensating digital data obtained by a time-to-digital converting circuit with a negative offset digital value approximately corresponding to the positive offset analog voltage and, more correctly, equal to the 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 is zero.
In addition, as obvious from the description of preferred embodiments which will be described later, various constructions can be used for the means for generating an offset analog voltage, for example, an input stage of a peak-holding circuit may be provided with an offset analog voltage-adding circuit for directly adding a positive offset analog voltage to input analog data fed into the peak-holding circuit or a comparative level-shifting circuit for generating a negative comparative level voltage approximately corresponding to a positive offset analog voltage fed to a zero-time detecting circuit.
Besides, various constructions can be used for the digital compensating means, for example, a time-to-digital converting circuit may be provided with an initial digital value-setting circuit for preliminary loading a pulse counter of the time-to-digital converter with a negative offset digital value approximately corresponding to a positive offset analog voltage either internally or externally, a digital adder for adding a negative offset digital value corresponding to a positive offset analog voltage added to digital data output from the time-to-digital converting circuit, or a digital subtracter for subtracting a positive offset digital value
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