| 摘要 |
A calibration circuit of a driver control circuit which controls a plurality of input/output drivers of an integrated circuit comprises first and second voltage/current converters, first, second and third comparators and a voltage/current converter circuit. The first voltage/current converter with an external resistor provides a reference voltage to half the value of a supply voltage of the calibration circuit. The second voltage/current converter is connected to a first pull-down driver whose pull-down driver voltage is set to half the supply voltage. The second comparator compares the reference voltage with the pull-down driver voltage to provide a first calibration signal. The voltage/current converter circuit is connected to a pull-up driver whose pull-up voltage is set to half the value of the supply voltage. The third comparator compares the reference voltage with the pull-up driver voltage in order to provide a second calibration signal.
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