Patent ID: 7113028

Claim:
A method for calibrating an active filter comprising at least one filter stage including at least one integrated resistance and at least one integrated capacitance provided in an integrated circuit, and at least one capacitive component is placed outside the integrated circuit as an external capacitance electrically connected to the integrated circuit, said method comprising: adjusting said at least one integrated resistance until it has, together with the at least one external capacitance, a first predetermined time constant, adjusting said at least one integrated capacitance until it has, together with said at least one integrated resistance, a second predetermined time constant, determining attenuation at a given frequency of said filter stage corresponding to at least one of said first time constant and said second time constant, calculating based on said attenuation a correction coefficient for a value of said integrated resistor or integrated capacitance on which said at least one time constant depends, and setting for said value a value in accordance with said correction coefficient.