Advanced Calibration Techniques for VNAs

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F lush S hor t d BF lush S hor t P has e de gWLS and Sliding-Load* Calibration Comparison –Flush Short0.2-1720-0.2-174-176-0.4-178-0.6-1800 10 20 30 40 50 60Frequency GHz0 10 20 30 40 50 60Frequency GHz* Commercially available (non-Agilent) sliding-load cal kitdata-based expanded cal (WLS)sliding-load calAdvanced VNA Calibration© Agilent Technologies, Inc. 2006 Page M6- 44
A irline S hor t d BD eviation f ro m L inea r P has e de gF ixed L oa d d BWLS and Sliding-Load* Calibration Comparison –5 cm Airline With Flush Short / Fixed Load0Magnitude2Phase-0.251-0.5-0.75-1-1.25-1.50-1-2-3-4Airline/short0 10 20 30 40 50 60Frequency GHzdata-based expanded cal (WLS)sliding-load calData-based calibration withexpanded math yields much lowermeasurement errors compared toconventional sliding-load calLoad-25-30-35-40-45-50-55-600 10 20 30 40 50 60Frequency GHzMagnitude* Commercially available (non-Agilent) sliding-load cal kit 0 10 20 30 40 50 60Advanced VNA CalibrationFrequency GHz© Agilent Technologies, Inc. 2006 Page M6- 45
Page 1 and 2: Advanced Calibration Techniquesfor
Page 3 and 4: Agenda• Overview of Calibration
Page 5 and 6: The Need for CalibrationHow do we g
Page 7 and 8: Systematic Measurement ErrorsRrecei
Page 9 and 10: Performing the Calibration: TRL•
Page 11 and 12: Unknown Thru CalibrationThe “Unkn
Page 13 and 14: Compromises of Traditional Non-Inse
Page 15 and 16: Unknown Thru AlgorithmUnknown thru
Page 17 and 18: Two-Port Unknown Thru Calibration S
Page 19 and 20: Unknown Thru Example Using Attenuat
Page 21 and 22: dBCable Movement ErrorCable Movemen
Page 23 and 24: Magnitude (dB)Comparing Unknown and
Page 25 and 26: Measuring Devices with Non-Aligned
Page 27 and 28: 4-Port Unknown Thru with Different
Page 29 and 30: Unknown Thru for Different Waveguid
Page 31 and 32: Traditional Polynomial-Based Models
Page 33 and 34: Calibration Standard Modeling Proce
Page 35 and 36: Benefits of Data-Based Standards•
Page 37 and 38: Data-Based Standard FileCITIFILE A.
Page 39 and 40: Advantage of Measuring More Than 3
Page 41 and 42: Factors That Contribute to Weightin
Page 43: F lush S hor t d BF lush S hor t P
Page 47 and 48: Offset Load Calibration Advantages
Page 49 and 50: DirectMeasurementModelingError Corr
Page 51 and 52: Automatic Port Extensions - Step 1
Page 53 and 54: Measurement ResultsDelay and loss c
Page 55 and 56: Which Standards Should I Use?• Fo
Page 57 and 58: Narrowband APE ExampleAPE with shor
Page 59 and 60: Summary of Automatic Port Extension
Page 61 and 62: Order of Fixturing Operations• Fi
Page 63 and 64: Differential Port MatchingAdvanced
Page 65 and 66: Two-Port De-Embedding.s2p file1 2Fi
Page 67 and 68: Two Versus Four Port Embedding /De-
Page 69 and 70: How Do I Get My Probe De-Embedding
Page 71 and 72: Measuring Probes Using Adapter-Remo
Page 73 and 74: Measuring Probes Using Unknown Thru
Page 75 and 76: What is Electronic Calibration?•
Page 77 and 78: Agilent’s “ECal” Line of Elec
Page 79 and 80: User Characterization: Using Adapte
Page 81 and 82: User Characterization: Applying Fix
Page 83 and 84: Summary (continued)• Two-tier TRL
Page 85 and 86: Additional Resources• Application

Advanced Calibration Techniques for VNAs

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