US5047725A
Expired / Lapsed
US
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Verification and correction method for an error model for a measurement network
Assignee: FormFactor Beaverton Inc
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Filing: 1989-11-28
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Granted: 1991-09-10
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Expires: 2009-11-28
Abstract
Abstract A method for correcting inaccuracies in error factors of an error model used for vector-corrected, microwave-frequency measurements. Verifying de-embedded measurements are compared to known characteristics of at least one verification standard. At least one parameter of the calibration standards, or an error factor, or measuring network geometry, is changed and the error factors are recalculated to bring the verifying measurements into conformity with the known characteristics of the verification standard.
Inventors
- 👤 Eric W. Strid
- 👤 Andrew C. Davidson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:49
CPC Classifications
G; G01; G01R; G01R35/00; G01R35/005
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
127 words
A method for correcting a multi-port error model having N error factors, where N is a predetermined integer, said N error factors being determined from at least N measurement taken with calibration standards in a multi-port measurement network, said method comprising the steps of: (a) measuring a network parameter of said multi-port measurement network including a verification standard having a known network parameter to obtain a verification measurement; (b) de-embedding said verification measurement using said N error factors; (c) comparing said de-embedded verification measurement with said known network parameter to obtain a modeling error; and (d) systematically altering at least one of said N error factors to obtain new error factors such that a new de-embedded verification measurement using said new error factors reduces said modeling error.
Claim 2
Independent Claim
127 words
A method for correcting a multi-port error model having N error factors, where N is a predetermined integer, said N error factors being determined from at least N measurement taken with calibration standards in a multi-port measurement network, said method comprising the steps of: (a) measuring a network parameter of said multi-port measurement network including a verification standard having a known network parameter to obtain a verification measurement; (b) de-embedding said verification measurement using said N error factors; (c) comparing said de-embedded verification measurement with said known network parameter to obtain a modeling error; and (d) systematically altering at least one of said N error factors to obtain new error factors such that a new de-embedded verification measurement using said new error factors reduces said modeling error.
Claim 3
Dependent Claim
25 words
The method of claim 1 wherein said altering of said error factors includes altering one of said network parameters for one of said calibration standards.
Claim 4
Dependent Claim
17 words
The method of claim 1 wherein said altering of said error factors includes altering said measurement network.
Claim 5
Dependent Claim
20 words
The method of claim 3 wherein said altering of said measurement network includes altering the position of a contact probe.
Claim 6
Dependent Claim
19 words
The method of claim 1 wherein said step (a) includes measuring a network parameter at more than one frequency.
Claim 7
Dependent Claim
19 words
The method of claim 1 wherein said step (a) includes measuring a network parameter which is independent of frequency.
Claim 8
Dependent Claim
25 words
The method of claim 1 wherein said verification standard is composed of first and second component verification standards that have network parameters in known relation.
Claim 9
Independent Claim
148 words
A method for calibrating multi-port measurements of a multi-port measurement network using an error model having N error factors, where N is a predetermined integer, comprising the steps of: (a) measuring network parameters of said multi-port measurement network, including at least one calibration standard having partially known network parameters, to obtain at least N independent measurements; (b) calculating said N error factors from said independent measurements; (c) measuring a network parameter of said measurement network including a verification standard having a known network parameter to obtain a verification measurement; (d) de-embedding said verification measurement using said N error factors; (e) comparing said de-embedded verification measurement with said known network parameter to obtain a modeling error; and (f) systematically altering at least one of said N error factors to obtain new error factors such that a new de-embedded verification measurement using said new error factors reduces said modeling error.
Claim 10
Independent Claim
148 words
A method for calibrating multi-port measurements of a multi-port measurement network using an error model having N error factors, where N is a predetermined integer, comprising the steps of: (a) measuring network parameters of said multi-port measurement network, including at least one calibration standard having partially known network parameters, to obtain at least N independent measurements; (b) calculating said N error factors from said independent measurements; (c) measuring a network parameter of said measurement network including a verification standard having a known network parameter to obtain a verification measurement; (d) de-embedding said verification measurement using said N error factors; (e) comparing said de-embedded verification measurement with said known network parameter to obtain a modeling error; and (f) systematically altering at least one of said N error factors to obtain new error factors such that a new de-embedded verification measurement using said new error factors reduces said modeling error.
Claim 11
Dependent Claim
25 words
The method of claim 8 wherein said altering of said error factors includes altering one of said network parameters for one of said calibration standards.
Claim 12
Dependent Claim
17 words
The method of claim 8 wherein said altering of said error factors includes altering said measurement network.
Claim 13
Dependent Claim
20 words
The method of claim 10 wherein said altering of said measurement network includes altering the position of a contact probe.
Claim 14
Dependent Claim
19 words
The method of claim 8 wherein said step (c) includes measuring a network parameter at more than one frequency.
Claim 15
Dependent Claim
19 words
The method of claim 8 wherein said step (c) includes measuring a network parameter which is independent of frequency.
Claim 16
Independent Claim
156 words
A method for calibrating measurements of a measurement network using an error model having N error factors, where N is a predetermined integer, comprising the steps of: (a) measuring network parameters of said measurement network, including at least one calibration standard having partially known network parameters, to obtain at least N independent measurements; (b) calculating said N error factors from said independent measurements; (c) measuring a network parameter of said measurement network including a verification standard having two network parameters in known relation which are independent of frequency to obtain a verification measurement; (d) de-embedding said verification measurement using said N error factors; (e) comparing said de-embedded verification measurement with said known relation of said two network parameters to obtain a modeling error; and (f) systematically altering at least two of said N error factors to obtain new error factors such that a new de-embedded verification measurement using said new error factors reduces said modeling error.
Claim 17
Independent Claim
156 words
A method for calibrating measurements of a measurement network using an error model having N error factors, where N is a predetermined integer, comprising the steps of: (a) measuring network parameters of said measurement network, including at least one calibration standard having partially known network parameters, to obtain at least N independent measurements; (b) calculating said N error factors from said independent measurements; (c) measuring a network parameter of said measurement network including a verification standard having two network parameters in known relation which are independent of frequency to obtain a verification measurement; (d) de-embedding said verification measurement using said N error factors; (e) comparing said de-embedded verification measurement with said known relation of said two network parameters to obtain a modeling error; and (f) systematically altering at least two of said N error factors to obtain new error factors such that a new de-embedded verification measurement using said new error factors reduces said modeling error.
Claim 18
Dependent Claim
19 words
The method of claim 14 wherein said step (c) includes measuring a network parameter at only a single frequency.
Claim 19
Dependent Claim
23 words
The method of claim 14 wherein said altering of said error factors includes altering two of said network parameters of said calibration standards.
Claim 20
Dependent Claim
17 words
The method of claim 14 wherein said altering of said error factors includes altering said measurement network.
Claim 21
Dependent Claim
20 words
The method of claim 17 wherein said altering of said measurement network includes altering the position of a contact probe.
References Cited (Backward Citations)
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