Device for the comparison of two resistors, and integrated resistor compensation system incorporating this device

The present invention relates to a device for comparing the value of two resistors as well as to a system for the compensation of integrated resistors whose operating values may vary as a function of their environmental parameters, such as temperature and manufacturing quality. A device for the comparison of two resistors is based upon analog information carried by currents. The device includes a measurement circuit for extracting the currents from the two resistors to be compared, and copies the currents to a parallel analog-digital converter that carries out the division of the extracted currents. The device converts the ratio of the extracted currents into a digital code that is the image of the ratio of the two resistors. The ratio is constantly re-updated as a function of environmental parameters of the circuit, such as the operating temperature. Also disclosed is a system for correcting the value of integrated compensated resistors. The system implements a device of this kind that does not use a reference voltage generator.