Calibration circuit for a driver control circuit, and driver control circuit

A Driver control circuit, comprising:

• an external resistor having a resistance corresponding to the resistance of an output line of said integrated circuit;
• said external resistor having a first terminal and a second terminal which is connected to ground;
• a first voltage/current converter being connected to said first terminal of said external resistor forming a first node and being connected to a supply voltage, so that a reference voltage in respect to ground appears at said first node;
• a first comparator configured to compare said reference voltage with a voltage having half the value of said supply voltage in order to generate a first amplified differential voltage which is converted by said first voltage/current converter into a first current, so that said first voltage/current converter regulates the reference voltage to half the value of said supply voltage;
• a second voltage/current converter, which is connected via a second node to a pull-down driver and converts said first amplified differential voltage into a second current being substantially identical to said first current, in order to set the pull-down driver voltage of said pull-down driver to half the supply voltage;
• a second comparator comparing said reference voltage with said pull-down driver voltage in order to provide a first calibration signal at the output of said second comparator;
• a voltage/current converter circuit, which is connected to a pull-up driver via a third node and converts said first amplified differential voltage into a third current having the negative value of said first current, in order to set the pull-up driver voltage of said pull-up driver to half the value of said supply voltage;
• a third comparator, which compares said reference voltage with said pull-up driver voltage in order to provide a second calibration signal at the output of said third comparator;
• a first control signal generating circuit, which receives said reference voltage, said first calibration signal, and said pull-down driver voltage, in order to generate a first regulating signal and a first control signal;
• said first regulating signal regulating said pull-down driver voltage to said reference voltage and said first control signal controlling pull-down drivers of a plurality of input/output drivers of an integrated circuit;
• and
• a second control signal generating circuit, which receives said reference voltage, said second calibration signal, and said pull-up driver voltage, in order to generate a second regulating signal and a second control signal;
• said second regulating signal regulating said pull-up driver voltage to said reference voltage and said second control signal controlling pull-up drivers of a plurality of pull-up drivers of said input/output drivers.