Patent ID: 6674302
Filing Date: 2004-01-06
Classification: H04L

Abstract:
A self-compensation circuit for terminal resistors with reference to an external resistor, the self-compensation circuit comprising:a current mirror providing a first current and a second current, the second current flowing through the external resistor to form a second voltage; a reference resistor being passed by the first current to form a first voltage and having a first control terminal to control the resistance of the reference resistor; a comparator comparing the difference between the first voltage and the second voltage, having a feedback voltage on an output end, and feeding the feedback voltage back to the first control terminal until the first voltage and the second voltage are equal; and a plurality of terminal resistors, each of the terminal resistors having a second control terminal connected to the output end of the comparator such that the resistance of each terminal resistor is proportional to the resistance of the external resistor.