US6356850B1
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Method and apparatus for jitter analysis
Assignee: Wavecrest Corp
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Filing: 1999-01-29
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Granted: 2002-03-12
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Expires: 2019-01-29
Abstract
Abstract A method, apparatus, and article of manufacture for separating the components of a jitter signal. The method includes the steps of obtaining measurements of the spans of a signal, generating variation measurements for each of the spans, transforming the variation estimates from a time domain to a frequency domain, and determining the random component and the periodic component of the jitter signal.
Inventors
- 👤 Jan B. Wilstrup
- 👤 Dennis M. Petrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:13
CPC Classifications
G; G01; G01R; G01R29/00; G01R29/26; G01R29/02; G01R29/027; G01R29/0273; H; H04; H04L; H04L1/00; H04L1/20; H04L1/205
Claims Analysis
Total Claims: 41
Claim 1
Independent Claim
118 words
A method of analyzing jitter in a signal having transitions which define spans over a time interval, the jitter having a random component and a periodic component, comprising the steps of: (a) identifying a reference edge; (b) obtaining a plurality of measurements for a plurality of spans, wherein each span comprises more than one edge and begins a first number of edges away from the reference edge and ends a second number of edges away from the reference edge; (c) generating variation estimates for the measurements for each of the spans; (d) transforming the variation estimates from a time domain to a frequency domain, and (e) determining the random component and the periodic component of the jitter signal.
Claim 2
Independent Claim
118 words
A method of analyzing jitter in a signal having transitions which define spans over a time interval, the jitter having a random component and a periodic component, comprising the steps of: (a) identifying a reference edge; (b) obtaining a plurality of measurements for a plurality of spans, wherein each span comprises more than one edge and begins a first number of edges away from the reference edge and ends a second number of edges away from the reference edge; (c) generating variation estimates for the measurements for each of the spans; (d) transforming the variation estimates from a time domain to a frequency domain, and (e) determining the random component and the periodic component of the jitter signal.
Claim 3
Dependent Claim
35 words
The method of claim 1 , wherein the determining step comprises the step of applying a constant false alarm filter to the frequency domain variation estimates to separate the random component and the periodic component.
Claim 4
Dependent Claim
15 words
The method of claim 2 , wherein the transforming step is performed through a FFT.
Claim 5
Dependent Claim
19 words
The method of claim 2 , further comprising the step of measuring the statistical confidence of the matching pattern.
Claim 6
Dependent Claim
13 words
The method of claim 1 , wherein the variation estimates comprise variance estimates.
Claim 7
Dependent Claim
14 words
The method of claim 1 , wherein one of the first numbers is zero.
Claim 8
Independent Claim
147 words
A method of analyzing jitter in a signal having a repetitive data pattern comprising transitions which define spans over a time interval, the jitter having a random component and a periodic component, comprising steps of: (a) identifying a reference edge; (b) measuring a unit interval of the data pattern; (c) determining a matching pattern; (d) calculating a measurement schedule defining a measurement set for each span; (e) obtaining a plurality of measurements for a plurality of spans, wherein each span comprises more than one edge and begins a first number of edges away from the reference edge and ends a second number of edges away from the reference edge; (f) generating variation estimates for the measurements for each of the spans; (g) transforming the variation estimates from a time domain to a frequency domain; and (h) determining the random component and the periodic component of the signal.
Claim 9
Independent Claim
147 words
A method of analyzing jitter in a signal having a repetitive data pattern comprising transitions which define spans over a time interval, the jitter having a random component and a periodic component, comprising steps of: (a) identifying a reference edge; (b) measuring a unit interval of the data pattern; (c) determining a matching pattern; (d) calculating a measurement schedule defining a measurement set for each span; (e) obtaining a plurality of measurements for a plurality of spans, wherein each span comprises more than one edge and begins a first number of edges away from the reference edge and ends a second number of edges away from the reference edge; (f) generating variation estimates for the measurements for each of the spans; (g) transforming the variation estimates from a time domain to a frequency domain; and (h) determining the random component and the periodic component of the signal.
Claim 10
Dependent Claim
42 words
The method of claim 7 , wherein the jitter comprises an ISI component and a DCD component, the determining a matching pattern step comprising the step of calculating ISI and DCD based on a comparison of the matching pattern and the measurements.
Claim 11
Dependent Claim
39 words
The method of claim 7 , wherein the determining a matching pattern step further comprises the steps of: rotating a reference pattern through a plurality of rotations; comparing the rotations to the data pattern; and choosing the matching pattern.
Claim 12
Dependent Claim
25 words
The method of claim 9 , wherein the comparing step comprises the step of comparing the rotations to the data pattern by the least-squared method.
Claim 13
Dependent Claim
42 words
The method of claim 7 , wherein the determining the random component and the periodic component step comprises the step of applying a constant false alarm filter to the frequency domain variation estimates to separate the random component and the periodic component.
Claim 14
Dependent Claim
15 words
The method of claim 7 , wherein the transforming step is performed through a FFT.
Claim 15
Dependent Claim
13 words
The method of claim 7 , wherein the variation estimates comprise variance estimates.
Claim 16
Dependent Claim
19 words
The method of claim 7 , further comprising the step of measuring the statistical confidence of the unit interval.
Claim 17
Dependent Claim
14 words
The method of claim 7 , wherein one of the first numbers is zero.
Claim 18
Independent Claim
171 words
An apparatus for analyzing jitter in a signal having a repetitive data pattern comprising transitions which define spans over a time interval, the jitter having a random component and a periodic component, the apparatus comprising: (a) a measurement apparatus for collecting data; (b) an analyzing unit, operatively connected to the measurement apparatus, for collecting data from the measurement apparatus, for identifying a reference edge, for measuring a unit interval of the data pattern, for determining a matching pattern, for calculating a measurement schedule defining a measurement set for each span, for obtaining a plurality of measurements for a plurality of spans wherein each span comprises more than one edge and begins a first number of edges away from the reference edge and ends a second number of edges away from the reference edge; for generating variation estimates for the measurements for each of the spans, for transforming the variation estimates from a time domain to a frequency domain; and for determining the random component and the periodic component of the signal.
Claim 19
Independent Claim
171 words
An apparatus for analyzing jitter in a signal having a repetitive data pattern comprising transitions which define spans over a time interval, the jitter having a random component and a periodic component, the apparatus comprising: (a) a measurement apparatus for collecting data; (b) an analyzing unit, operatively connected to the measurement apparatus, for collecting data from the measurement apparatus, for identifying a reference edge, for measuring a unit interval of the data pattern, for determining a matching pattern, for calculating a measurement schedule defining a measurement set for each span, for obtaining a plurality of measurements for a plurality of spans wherein each span comprises more than one edge and begins a first number of edges away from the reference edge and ends a second number of edges away from the reference edge; for generating variation estimates for the measurements for each of the spans, for transforming the variation estimates from a time domain to a frequency domain; and for determining the random component and the periodic component of the signal.
Claim 20
Dependent Claim
29 words
The apparatus of claim 16 , wherein the analyzing unit further comprises: means for calculating ISI and DCD based on a comparison of the matching pattern and the measurements.
Claim 21
Dependent Claim
26 words
The apparatus of claim 16 , wherein the analyzing unit further comprises: means for applying a constant false alarm filter to the frequency domain variation estimates.
Claim 22
Dependent Claim
14 words
The apparatus of claim 16 , wherein one of the first numbers is zero.
Claim 23
Dependent Claim
36 words
The apparatus of claim 16 , wherein the jitter comprises an ISI component and a DCD component, wherein the analyzing unit calculates ISI and DCD based on a comparison of the matching pattern and the measurements.
Claim 24
Dependent Claim
31 words
The apparatus of claim 16 , wherein the analyzing unit rotates a reference pattern through a plurality of rotations, compares the rotations to the data pattern, and chooses the matching pattern.
Claim 25
Dependent Claim
21 words
The apparatus of claim 16 , wherein the analyzing unit compares the rotations to the data pattern by the least-squared method.
Claim 26
Dependent Claim
25 words
The apparatus of claim 16 , wherein the analyzing unit comprises a constant false alarm filter for separating the random component and the periodic component.
Claim 27
Dependent Claim
10 words
The apparatus of claim 16 , further comprising a FFT.
Claim 28
Dependent Claim
13 words
The apparatus of claim 16 , wherein the variation estimates comprise variance estimates.
Claim 29
Dependent Claim
18 words
The apparatus of claim 16 , wherein the analyzing unit measures the statistical confidence of the unit interval.
Claim 30
Dependent Claim
18 words
The apparatus of claim 16 , wherein the analyzing unit measures the statistical confidence of the matching pattern.
Claim 31
Dependent Claim
182 words
An article of manufacture comprising a program storage medium readable by a computer having a memory, the medium tangibly embodying one or more programs of instructions executable by the computer to perform method steps for analyzing jitter in a signal having a repetitive data pattern comprising transitions which define spans over a time interval, the jitter having a random component and a periodic component, the method comprising the steps of: (a) identifying a reference edge; (b) measuring a unit interval of the data pattern; (c) determining a matching pattern; (d) calculating a measurement schedule defining a measurement set for each span; (e) obtaining a plurality of measurements for a plurality of spans, wherein each span comprises more than one edge and begins a first number of edges away from the reference edge and ends a second number of edges away from the reference edge; (f) generating variation estimates for the measurements for each of the spans; (g) transforming the variation estimates from a time domain to a frequency domain; and (h) determining the random component and the periodic component of the signal.
Claim 32
Dependent Claim
182 words
An article of manufacture comprising a program storage medium readable by a computer having a memory, the medium tangibly embodying one or more programs of instructions executable by the computer to perform method steps for analyzing jitter in a signal having a repetitive data pattern comprising transitions which define spans over a time interval, the jitter having a random component and a periodic component, the method comprising the steps of: (a) identifying a reference edge; (b) measuring a unit interval of the data pattern; (c) determining a matching pattern; (d) calculating a measurement schedule defining a measurement set for each span; (e) obtaining a plurality of measurements for a plurality of spans, wherein each span comprises more than one edge and begins a first number of edges away from the reference edge and ends a second number of edges away from the reference edge; (f) generating variation estimates for the measurements for each of the spans; (g) transforming the variation estimates from a time domain to a frequency domain; and (h) determining the random component and the periodic component of the signal.
Claim 33
Dependent Claim
14 words
The article of claim 28 , wherein one of the first numbers is zero.
Claim 34
Dependent Claim
42 words
The article of claim 28 , wherein the jitter comprises an ISI component and a DCD component, the determining a matching pattern step comprising the step of calculating ISI and DCD based on a comparison of the matching pattern and the measurements.
Claim 35
Dependent Claim
39 words
The article of claim 28 , wherein the determining a matching pattern step further comprises the steps of: rotating a reference pattern through a plurality of rotations; comparing the rotations to the data pattern; and choosing the matching pattern.
Claim 36
Dependent Claim
25 words
The article of claim 31 , wherein the comparing step comprises the step of comparing the rotations to the data pattern by the least-squared method.
Claim 37
Dependent Claim
42 words
The article of claim 28 , wherein the determining the random component and the periodic component step comprises the step of applying a constant false alarm filter to the frequency domain variation estimates to separate the random component and the periodic component.
Claim 38
Dependent Claim
15 words
The article of claim 28 , wherein the transforming step is performed through a FFT.
Claim 39
Dependent Claim
13 words
The article of claim 28 , wherein the variation estimates comprise variance estimates.
Claim 40
Dependent Claim
19 words
The article of claim 28 , further comprising the step of measuring the statistical confidence of the unit interval.
Claim 41
Dependent Claim
19 words
The article of claim 28 , further comprising the step of measuring the statistical confidence of the matching pattern.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 2005-03-11 | 2005-09-10 | 2006-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-03-11 | 2009-09-10 | 2010-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-03-11 | 2013-09-10 | 2014-03-12 | $7700.00 | Window Closed / Lapsed |