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Slide 1 Fixture Measurements Doug Rytting

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Slide 2 Agenda Agilent Network Analysis Applying the 8510 TRL Calibration for Non-Coaxial Measurements Product Note A Agilent De-embedding and Embedding S-Parameter Networks Using a Vector Network Analyzer Product Note A In-Fixture Measurements Using Vector Network Analyzers Agilent AN Other Asymmetrical Reciprocal Optimization Two-Tier Calibration and Simplified Error Models

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Slide 3 Content of Application Note TRL Calibration in Fixture TRL Calibration on PC Board

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Slide 4 Microstrip Test Fixture

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Slide 5 Microstrip DUT in Fixture

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Slide 6 Calibration Model

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Slide 7 TRL Calibration Process

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Slide 8 TRL Calibration Process Steps

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Slide 9 Calibration Comparison

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Slide 10 Calibration Comparison

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Slide 11 PC Board TRL Calibration

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Slide 12 PC Board vs Fixture

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Slide 13 Time Domain of Launch and DUT

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Slide 14 Agenda Agilent Network Analysis Applying the 8510 TRL Calibration for Non-Coaxial Measurements Product Note A Agilent De-embedding and Embedding S-Parameter Networks Using a Vector Network Analyzer Product Note A In-Fixture Measurements Using Vector Network Analyzers Agilent AN Other Asymmetrical Reciprocal Optimization Two-Tier Calibration and Simplified Error Models

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Slide 15 Content of Application Note De-embed Process De-embed using ADS models

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Slide 16 Text Fixture

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Slide 17 Fixture Model

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Slide 18 Definition of T-Parameters

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Slide 19 S-Parameters and T-Parameters

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Slide 20 Combine Fixture and NA Models Combing a Two-Tier Calibration

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Slide 21 Definition of Error Terms

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Slide 22 Definition of Error Terms

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Slide 23 Fixture Model Using: Lossy Transmission Lines

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Slide 24 Model of Coax to Microstrip Transition

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Slide 25 Complete ADS Model of Test Fixture

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Slide 26 Measured vs Modeled Fixture Optimize until Modeled Matches Measured

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Slide 27 S 11 : De-embedded vs Coax Calibration Surface Mount Amplifier

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Slide 28 S 21 : De-embedded vs Coax Calibration Surface Mount Amplifier

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Slide 29 Agenda Agilent Network Analysis Applying the 8510 TRL Calibration for Non-Coaxial Measurements Product Note A Agilent De-embedding and Embedding S-Parameter Networks Using a Vector Network Analyzer Product Note A In-Fixture Measurements Using Vector Network Analyzers Agilent AN Other Asymmetrical Reciprocal Optimization Two-Tier Calibration and Simplified Error Models

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Slide 30 Content of Application Note Practical Considerations for Fixture Calibrations. Time Domain Used to Reduce Errors.

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Slide 31 Typical R&D Fixture

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Slide 32 Direct Measurement Using Calibration

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Slide 33 Two-Port Calibration

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Slide 34 Determining Open Capacitance

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Slide 35 Load Standard

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Slide 36 Thru Standard

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Slide 37 TDR Basics

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Slide 38 TDR Basics

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Slide 39 Gating The gating may include the launches by mistake.

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Slide 40 Optimizing Load

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Slide 41 Connectors on Fixtures

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Slide 42 Connector Performance

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Slide 43 Agenda Agilent Network Analysis Applying the 8510 TRL Calibration for Non-Coaxial Measurements Product Note A Agilent De-embedding and Embedding S-Parameter Networks Using a Vector Network Analyzer Product Note A In-Fixture Measurements Using Vector Network Analyzers Agilent AN Other Asymmetrical Reciprocal Optimization Two-Tier Calibration Simplified Error Models

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Slide 44 Asymmetrical Reciprocal Optimization A passive asymmetrical reciprocal device is used in addition to short, open, load, and thru standards. The errors in calibration kit parameters can be reduced through numerical optimization to minimize asymmetry after correction. There are some potential convergence issues.

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Slide 45 Asymmetrical Device

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Slide 46 Before and After Optimization

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Slide 47 Transmission Line Optimized Calibration Measure S 21m of a long transmission line. Calculate S 11c =S 21m S 21m of the transmission line. Measure S 11m of the transmission line with short connected to the end. Subtract S 11c from S 11m for comparison. Adjust capacitance of open to minimize ripple. Adjust inductance of load and short to match the calculated S 11c and measured S 11m of the transmission line. If possible, connect the load on the end of the long transmission line and adjust inductance of the load model for best performance. Then adjust the open and short models using a short connected to the end of the long transmission line.

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Slide 48 Transmission Line Optimized Calibration Coax example using a 10 cm verification airline with a short on the end. Before and after optimizing the calibration standards models. Same approach can be used for fixture and on wafer measurements using a long verification transmission line.

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Slide 49 Two-Tier Calibration First tier calibration stored in network analyzer. Second tier calibration performed with first tier calibration turned on. First tier could be SOLT and second tier TRL. This method enables TRL calibration on a 3 receiver NA. First tier could be at coax port of NA and second tier at ports of a fixture This process will characterize the fixture.

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Slide 50 Simplified Error Model for Fixture Using Two-Tier Technique Allows simpler second tier calibrations since number of error terms reduced from 7 to 6 due to reciprocity of the fixture. For example, SOLT can be simplified to SOL since no thru is required. Once fixture is characterized the data can be stored and used in future calibrations. Many other simplified fixture calibrations are available.

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