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The integrator is charged from the unknown voltage for a fixed time defined by the converter clock. It is then fully discharged connected to the reference voltage, and the discharge time is measured by the same clock. The ratio of the input to the reference is the ratio of discharge to charge times. Since the integrator and the clock are the same during charge and discharge they do not contribute to errors, although offset and bias currents do. However these may be cancelled out by using four charge/discharge cycles instead of two with the resulting conversion being very accurate.
PTM Published on: 2007-10-05
Denmark