Polynomial fit for jitter separation
First Claim
1. A method for determining the amount of deterministic jitter and random jitter in a digital signal having transitions between logical levels, the method comprising the steps of:
- a) determining a plurality of bit error rate values, each bit error rate value being associated with one of a plurality of successive timing points, b) applying a polynomial fit to said plurality of bit error rate values associated with said timing points for determining a number of polynomial coefficients of said polynomial fit, and c) deriving the amount each of said deterministic and said random jitter from said polynomial coefficients.
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Abstract
A method for determining the amount of deterministic jitter and random jitter in a digital signal having transitions between logical levels, the method comprising the steps of: providing said digital signal, determining a plurality of bit error rate values, each bit error rate value being associated with one of a plurality of successive timing points, and each bit error rate value being derived from a comparison of a result of a detection of a transition occurring in the digital signal cumulatively prior to its associated timing point with an expected signal, applying a polynomial fit in time to said plurality of bit error rate values associated with said timing points for determining a number of polynomial coefficients of said polynomial fit, and deriving the amount each of said deterministic and said random jitter from said polynomial coefficients.
17 Citations
15 Claims
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1. A method for determining the amount of deterministic jitter and random jitter in a digital signal having transitions between logical levels, the method comprising the steps of:
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a) determining a plurality of bit error rate values, each bit error rate value being associated with one of a plurality of successive timing points, b) applying a polynomial fit to said plurality of bit error rate values associated with said timing points for determining a number of polynomial coefficients of said polynomial fit, and c) deriving the amount each of said deterministic and said random jitter from said polynomial coefficients. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An arrangement for determining the amount of deterministic jitter and random jitter in a digital signal having transitions between logical levels, comprising:
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a measurement unit for determining a plurality of bit error rate values, each bit error rate value being associated with one of a plurality of successive timing points, a data processing unit capable of applying a polynomial fit to said plurality of bit error rate values associated with said timing points for determining a number of polynomial coefficients of said polynomial fit, and for deriving the amount each of said deterministic and said random jitter from said polynomial coefficients.
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14. A bit error rate tester, comprising:
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a measurement device for measuring a plurality of bit error rate values in a digital signal having transitions between logical levels, each bit error rate value being associated with one of a plurality of successive timing points, a data processing unit capable of applying a polynomial fit to said plurality of bit error rate values associated with said timing points for determining a number of polynomial coefficients of said polynomial fit, and for deriving the amount each of deterministic and random jitter from said polynomial coefficients.
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15. A program storage medium, preferably stored on a data carrier, embodying a program of instructions executable on a data processing system such as a computer to perform method steps for determining the amount of deterministic jitter and random jitter in a digital signal having transitions between logical levels, said method steps comprising:
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a) determining a plurality of bit error rate values, each bit error rate value being associated with one of a plurality of successive timing points, b) applying a polynomial fit to said plurality of bit error rate values associated with said timing points for determining a number of polynomial coefficients of said polynomial fit, and c) deriving the amount each of said deterministic and said random jitter from said polynomial coefficients.
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Specification