Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Patent
1988-09-12
1991-01-29
Shoop, Jr., William M.
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
341118, H03M 150
Patent
active
049890050
ABSTRACT:
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.
REFERENCES:
patent: 2824285 (1958-02-01), Hunt
patent: 3982241 (1976-09-01), Lipcon
patent: 4183016 (1980-01-01), Sawagata
patent: 4288873 (1981-09-01), Gingell
Ohnishi Yoshiro
Wakiyama Yoshihiro
Hoff Marc S.
Horiba Ltd.
Shoop Jr. William M.
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