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US 7,030,625 B1Granted
Method and apparatus for performing a minimum connection multiport through-reflect-line calibration and measurement
AssigneeAgilent Technologies, Inc.
InventorsAli Boudiaf, Vahe′ A. Adamian
Life of this patent
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Abstract
A method and apparatus for calibrating a multiport measurement path using through, high reflect and line calibration standards presents the through standard between no more than N−1 other pairs of measurement ports where at least one of the other pairs is a proximal pair.
Claims22
A method of calibrating a measurement path comprising the steps of:
- providing a vector network analyzer having at least two reference receivers, and a total of 2N measurement ports, wherein N is an integer,
- presenting a high reflect calibration standard and measuring a reflection characteristic for each said measurement port,
- presenting a line calibration standard between N direct pairs of said measurement ports and measuring forward and reverse reflection and transmission characteristics for each one of said N direct pairs of said measurement ports,
- presenting a through calibration standard between said N direct pairs of said measurement ports and measuring forward and reverse reflection and transmission characteristics for each one of said N direct pairs of said measurement ports,
- calculating directivity, source match, load match and reflection tracking error coefficients for each one of said measurement ports, and
- presenting said through calibration standard between no more than N−1 other pairs of measurement ports, said N−1 other pairs being any combination selected from the group consisting of indirect pairs and at least one proximal pair of measurement ports, measuring forward and reverse reflection and transmission characteristics, and calculating the forward and reverse transmission tracking error coefficients for each one of said N−1 other pairs of measurement port combinations.
3 more elements
An apparatus for calibrating a measurement path comprising:
- a vector network analyzer having at least two reference receivers, two test channels, and a total of 2N measurement ports, wherein N is an integer,
- means for measuring and storing high reflect characteristics for each said measurement port when a high reflect calibration standard is connected thereto, line forward and reverse reflection and transmission characteristics for each one of N direct pairs of said measurement ports when a line calibration standard is connected therebetween, direct through forward and reverse reflection and transmission characteristics for each one of said N direct pairs of said measurement ports when a through calibration standard is connected therebetween, and through forward and reverse reflection and transmission characteristics for N−1 other pairs of said measurement ports only when said through calibration standard is connected therebetween, said other pairs of said measurement ports selected from the group consisting of indirect pairs and at least one proximal pairs of measurement ports,
- means for calculating directivity, source match, reflection tracking for each one of said direct pairs of said measurement ports and
- means for calculating the forward and reverse transmission tracking error coefficients for each said N−1 other pairs of measurement ports.
1 more element
Dependencies are inferred from the claim text.