Patent attributes
A calibration circuit including a plurality of first resistance components, a plurality of second resistance components, and a first feedback system is provided. The first feedback system selects M1 first resistance components and N1 second resistance components so that a first combination of the M1 first resistance components and the N1 second resistance components substantially matches the impedance of a first resistor. The first feedback system selects M2 first resistance components and N2 second resistance components so that a second combination of the M2 first resistance components and the N2 second resistance components substantially matches the impedance of the first resistor. Based on the values of M1, N1, M2, N2, and a target impedance, the first feedback system generates a first set of calibration signals for a plurality of third resistance components and generates a second set of calibration signals for a plurality of fourth resistance components.
