Patent ID: 7548823

Claim:
A method for determining a first value of a first circuit metric under measurement and a second value of a second circuit metric under measurement within an integrated circuit, comprising: measuring a first time delay or oscillation frequency of a first circuit; measuring a second time delay or oscillation frequency of a second circuit, wherein a predetermined first sensitivity of the first time delay or oscillation frequency of the first circuit to the first circuit metric under measurement differs from a predetermined second sensitivity of the second time delay or oscillation frequency of the second circuit to the first circuit metric under measurement, wherein a predetermined third sensitivity of the first time delay or oscillation frequency of the first circuit to a second circuit metric under measurement differs from a predetermined fourth sensitivity of the second time delay or oscillation frequency of the second circuit to the second circuit metric under measurement; determining the first value of the first circuit metric under measurement from of the first time delay or oscillation frequency the second time delay or oscillation frequency, the first sensitivity and the second sensitivity; and determining the second value of the second circuit metric under measurement from of the first time delay or oscillation frequency, the second time delay or oscillation frequency, the third sensitivity and the fourth sensitivity.