Method and device for detecting period length fluctuations of periodic signals
AssigneeInfineon Technologies AG
InventorsHans-Dieter Oberle, Sebastian Sattler
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Abstract
To determine the period length of a first signal, the length is measured by counting the periods of a second signal with a shorter period length. To measure the fluctuations of the period length of the first signal whilst also taking into account the fluctuations of the period length of the second signal, the measurement is carried out for two different values of the period length of the second signal. Both the fluctuations of the period length of the first signal and the accumulated fluctuations of the period length of the second signal are calculated independently of one another from the two values. The method enables the period length fluctuations of a first signal that originates from a phase-locked loop to be detected.
Claims19
A method for detecting period length fluctuations of at least one of a periodic first signal and of a periodic second signal in which a period length of the second signal is shorter than a period length of the first signal and a reference number of the periods of the second signal that arise in the time-span of a base number of periods of the first signal is obtained, the method comprising:
- determining a first reference number for a first period length of the second signal and a second reference number for a second period length, different from the first period length, of the second signal;
- and
- calculating a measure for the period length fluctuation of at least one of the first signal and of the second signal dependent on the first and second reference number.
An apparatus for detecting period length fluctuations of at least one of a periodic first signal and a periodic second signal in which a period length of the second signal is shorter than a period length of the first signal, wherein the apparatus comprises an evaluation circuit that:
- determines a reference number from periods of the second signal that arise in the time-span of a base number of periods of the first signal;
- and determines a first reference number for a first period length of the second signal and a second reference number for a second period length, different from the first period length of the second signal, dependent on the first reference number and the second reference number, and wherein a measure of the period length fluctuation of at least one of the first signal and of the second signal is determined.
Dependencies are inferred from the claim text.