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Fixture Measurements Doug Rytting

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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 In-Fixture Measurements Using Vector Network Analyzers Agilent AN Other Asymmetrical Reciprocal Optimization Two-Tier Calibration and Simplified Error Models

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**Content of Application Note**

TRL Calibration in Fixture TRL Calibration on PC Board

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**Microstrip Test Fixture**

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**Microstrip DUT in Fixture**

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Calibration Model

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**TRL Calibration Process**

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**TRL Calibration Process Steps**

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**Calibration Comparison**

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**Calibration Comparison**

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**PC Board TRL Calibration**

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PC Board vs Fixture

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**Time Domain of Launch and DUT**

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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 In-Fixture Measurements Using Vector Network Analyzers Agilent AN Other Asymmetrical Reciprocal Optimization Two-Tier Calibration and Simplified Error Models

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**Content of Application Note**

De-embed Process De-embed using ADS models

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Text Fixture

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Fixture Model

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**Definition of T-Parameters**

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**S-Parameters and T-Parameters**

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**Combine Fixture and NA Models Combing a Two-Tier Calibration**

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**Definition of Error Terms**

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**Definition of Error Terms**

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**Fixture Model Using: Lossy Transmission Lines**

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**Model of Coax to Microstrip Transition**

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**Complete ADS Model of Test Fixture**

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**Measured vs Modeled Fixture Optimize until Modeled Matches Measured**

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**S11: De-embedded vs Coax Calibration Surface Mount Amplifier**

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**S21: De-embedded vs Coax Calibration Surface Mount Amplifier**

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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 In-Fixture Measurements Using Vector Network Analyzers Agilent AN Other Asymmetrical Reciprocal Optimization Two-Tier Calibration and Simplified Error Models

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**Content of Application Note**

Practical Considerations for Fixture Calibrations. Time Domain Used to Reduce Errors.

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Typical R&D Fixture

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**Direct Measurement Using Calibration**

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Two-Port Calibration

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**Determining Open Capacitance**

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Load Standard

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Thru Standard

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TDR Basics

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TDR Basics

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**Gating The gating may include the launches by mistake.**

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Optimizing Load

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**Connectors on Fixtures**

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**Connector Performance**

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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 In-Fixture Measurements Using Vector Network Analyzers Agilent AN Other Asymmetrical Reciprocal Optimization Two-Tier Calibration Simplified Error Models

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**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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Asymmetrical Device

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**Before and After Optimization**

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**Transmission Line Optimized Calibration**

Measure S21m of a long transmission line. Calculate S11c=S21mS21m of the transmission line. Measure S11m of the transmission line with short connected to the end. Subtract S11c from S11m for comparison. Adjust capacitance of open to minimize ripple. Adjust inductance of load and short to match the calculated S11c and measured S11m 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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Transmission Line Optimized Calibration Coax example using a 10 cm verification airline with a short on the end. Before and after optimizing the calibration standard’s models. Same approach can be used for fixture and on wafer measurements using a long verification transmission line.

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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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**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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