Adapter characterization up to 110 GHz

Transcription

1 Adapter characterization up to 110 GHz EMRP HF Circuits project: 6 th European ANAMET meeting

2 Adapter characterization: Motivation The challenges of an adapter characterization: Sheet Series Adaptor /11-_UE ption plug/plug g (male) / PC 1 plug (male) & Measurement applications adaptor standard C 1 - IEEE 287:2007 Data Sheet - insertable vs non-insertable (same connector family) Within Series Adaptor - non-insertable 31_PC /111_UE (between different connector families) - Waveguide Description to coax (straight vs angular) Adaptor jack/jack PC 1 jack (female) / PC 1 jack (female) For Test & Measurement applications Precision adaptor Interface standard Series PC 1 - IEEE 287:2007 ical Data Technical Data l Data Electrical Data e 50 Ω Impedance 50 Ω frequency max. 110 GHz Interface frequency max. 110 GHz y range DC to 50 GHz 50 to 75 GHz 75 to 110 GHz Frequency range DC to 50 GHz 50 to 75 GHz 75 to 110 GHz ss 20 db 17.5 db 16 db 50 to 75 GHz Return 75 lossto 110 GHz 20 db 17.5 db 16 db 17.5 db 16 db ical Data Mechanical Data kg Number of matings 100 mental Data Weight kg temperature 15 C to 30 C U (RoHS) compliant Environmental Data Operating temperature 15 C to 30 C Data 2011/65/EU (RoHS) compliant - PC 1 plug (male) Material Data ts Material Surface Plating Jürg Rüfenacht Interface - PC and 1 jack the (female) METAS VNA gang EMRP HF-Circuits: 6th European ANAMET ntact Copper Beryllium Alloy Gold Plating (without Nickel underplating) tact Piece Parts Surface Plating Copper Beryllium Alloy Material Gold Plating (without Nickel underplating) Surface Plating

3 Adapter characterization: Motivation / measurement challenges Waveguide and 1.0 mm setup at METAS Jürg Rüfenacht and the METAS VNA gang EMRP HF-Circuits: 6th European ANAMET

4 Agenda 1. Typical adapter characterization techniques 2. Pro and cons of these adapter measurement techniques 3. New findings in coaxial VNA metrology - Systematic connector effects - VNA Tools : GUM compliant uncertainty process 4. Two practical 1.0 mm adapter characterization examples 5. Conclusions Jürg Rüfenacht and the METAS VNA gang EMRP HF-Circuits: 6th European ANAMET

5 The ideal case: an insertable adapter VNA Port 1 DUT VNA Port 2 Step 1: Cal Forward reflection calibration measures: EDF, ESF, ERF using on : Open, Short, Load Step 2: Cal Reverse reflection calibration measures: EDR, ESR, ERR using on : Open, Short, Load Step 3: Forward and Reverse transmission calibration measures: ELF, ETF, ELR, ETR with Port 1 and Port 2 connected together Step 4: DUT Device measurement measures: S11, S21 then reverse stimulus to measure: S22, S12 Jürg Rüfenacht and the METAS VNA gang EMRP HF-Circuits: 6th European ANAMET

6 Minimal number of connections = 9; minimal cable movements = 2 The ideal case: an insertable adapter VNA Port 1 DUT VNA Port 2 Step 1: 3 Cal Forward reflection calibration measures: EDF, ESF, ERF using on : Open, Short, Load Step 2: Step 3: Cal Reverse reflection calibration measures: EDR, ESR, ERR using on : Open, Short, Load Forward and Reverse transmission calibration measures: ELF, ETF, ELR, ETR with Port 1 and Port 2 connected together Step 4: DUT 1 1 Device measurement measures: S11, S21 then reverse stimulus to measure: S22, S12 Jürg Rüfenacht and the METAS VNA gang EMRP HF-Circuits: 6th European ANAMET

7 Minimal number of connections = 10; minimal cable movements = 2 Divide-by-two methodologies VNA Port 1 DUT DUT VNA Port 2 Step 1: Cal Forward reflection calibration Step 2: Cal Reverse reflection calibration Step 3: Forward and Reverse transmission calibration Step 4: DUT DUT Device measurement Step 5: Pair of two back-to-back adapters to get the S-parameter data set of one adapter -> Made assumptions: same length, no reflection between the DUT adapters Jürg Rüfenacht and the METAS VNA gang EMRP HF-Circuits: 6th European ANAMET

8 Minimal number of connections = 14; minimal cable movements = 3 Swap equal adapter technique Thru measurement using a: Test Set Port 1 A1 DUT A2 Test Set Port 2 A3 Wrong Adapter Step 1: A3 A2 Forward Transmission: ETF Forward Match: ELF Step 2: A1 A3 Reverse Transmission: ETR Reverse Match: ELR Step 3: A1 Cal Forward reflection calibration Step 4: Cal A2 Reverse reflection calibration Step 5: A1 DUT A2 Device measurement Jürg Rüfenacht and the METAS VNA gang EMRP HF-Circuits: 6th European ANAMET

9 Adapter removal technique Minimal number of connections = 18 (16); minimal cable movements = 3 (2) Test Set Port 1 DUT Test Set Port 2 Step 1: CAL First full 2-port calibration set Step 2: CAL Second full 2-port calibration set Step 3: To apply the adapter removal algorithm in order to define the and reference planes (this algorithm is directly supported by most commercial VNA firmware). Step 4: 1. DUT 2. DUT measurements Jürg Rüfenacht and the METAS VNA gang EMRP HF-Circuits: 6th European ANAMET

10 Minimal number of connections = 8; minimal cable movements = 1 Unknown Thru calibration (SOLR, UOSM) Test Set Port 1 DUT Test Set Port 2 Step 1: Cal 1-port calibration on Step 2: Cal 1-port calibration on Step 3: 1. DUT 2. 2-port and switch term measurement Step 4: To apply the Unknown Thru calibration algorithm -> Made assumption of a passive and reciprocal DUT (S21 = S12) -> Additional measurements of the switch terms needed (two more sweeps) Jürg Rüfenacht and the METAS VNA gang EMRP HF-Circuits: 6th European ANAMET

11 Minimal number of connections = 7; minimal cable movements = 0 1-port measurements de-embedding technique Test Set Port 1 DUT Step 1: Cal First: 1-port calibration on Step 2: 1. DUT Cal Second: 1-port calibration at the DUT adapter end Must be repeated for each adapter! Step 3: De-embedding of the error box 1 from the error box 2 plus to mathematical correct for the assumptions of a passive and reciprocal DUT (S21 = S12) Transmission coefficient post processing correction (passive and reciprocal): S21 S12 S21 S12 Jürg Rüfenacht and the METAS VNA gang EMRP HF-Circuits: 6th European ANAMET

12 Typical non-insertable adapter characterization techniques summary: Divide-by-two methodologies (only poor accuracy) Many wrong assumptions Minimal connections: 10, minimal cable movements: 2 Swap equal adapter technique (only modest accuracy) Assumption: well matched swapping adapters showing good repeatability. Minimal connections: 14, minimal cable movements: 3 Adapter removal technique based on two full 2-port calibrations Many connections and cable movements -> therefore time intensive. Minimal connections: 18 (16), minimal cable movements: 3 (2) SOLR (Short, Open, Load, Reciprocal) also known as Unknown-Thru No cable movements but sensitive to the knowledge of all calibration standards. Minimal connections: 8, minimal cable movements: 1 1-port measurements de-embedding technique (repeat for each single adapter) No cable movements but sensitive to the knowledge of all calibration standards. Minimal connections: 7, minimal cable movements: 0 (no additional cable needed) Jürg Rüfenacht and the METAS VNA gang EMRP HF-Circuits: 6th European ANAMET

13 New findings in VNA metrology: the systematic connector effects How was METAS able to improve the accuracy of the adapter characterization techniques? New: Connector effects and VNA Tools (METAS UncLib) Supported coaxial line systems: 1.0 mm, 1.85 mm, 2.4 mm, 2.92 mm, 3.5 mm, Type-N (50 ohm), connector corr X 1 X 2 X 3 f 1 f 2 Y 1 corr Y 1 Y 2 95% V J V J T Y f,x X f,x Y 2 Jürg Rüfenacht METAS Seminar, New developments in VNA metrology

14 New findings in VNA metrology: the systematic connector effects Before 2006 Effects observed in practical VNA measurements: Inconsistencies between different calibration algorithms Erratic variations in airline based measurements Air Line Test Port with bead Coaxial beadless transmission line Test Port with bead Jürg Rüfenacht METAS Seminar, New developments in VNA metrology

15 New findings in VNA metrology: the systematic connector effects Relevant VNA research projects ( ) linked with coaxial S-parameter measurement metrology Industry partner(s): CoMo70, CalCon, VNA Tools, ONE-mm EMRP: HF-Circuits (NPL, CMI, LNE, METAS, PTB, SP, VSL) The concept of the half connectors and numerical modelling: - Enables an accurate definition of the electrical reference plane and therefore a better modelling of the primary calibration standards. Centre conductor coupling issues: - Very small pin gaps provoke unpredictable near field effects. Beadless airline handling concept: - Dielectric disc to control the longitudinal position of the centre conductor. GUM compliant uncertainty process: - Linear uncertainty propagation using a VNA measurement model and defined input quantities. Jürg Rüfenacht METAS Seminar, New developments in VNA metrology

16 New findings in VNA metrology: the systematic connector effects Air Line model without connector effects Air Line a 00 a 01 a 10 a 11 Jürg Rüfenacht METAS Seminar, New developments in VNA metrology

17 New findings in VNA metrology: the systematic connector effects Air Line model including the systematic connector effects (with half connector concept) Connector Air Line Con. b 10 b 00 b 11 c 00 c 01 d 10 c 10 c 11 d00 d11 b 01 d 01 Jürg Rüfenacht METAS Seminar, New developments in VNA metrology

18 1 st example: 1.0 mm (male-female) adapter cascadation 1.0 mm adapter cascadation example, GHz ( measured pair versus a numeric cascaded pair ) Comparing two calibration kit standard definitions concepts: Keysight (generic and ignoring the systematic connector effects) METAS (serialized and including the systematic connector effects) 2-port over-determined optimization calibration (85059A) -> the cal kit consists of 4 Offset Shorts including an Open and Load Starting from exactly the same S-parameter raw data files! Jürg Rüfenacht and the METAS VNA gang EMRP HF-Circuits: 6th European ANAMET

19 1 st example: 1.0 mm (male-female) adapter cascadation 1.0 mm adapter cascadation example, GHz ( measured pair versus a numeric cascaded pair ) 75 to 110 GHz 16 db Measurement 1: VNA 1.0 mm(m) Ada 1 VNA 1.0 mm(f) Measurement 2: VNA 1.0 mm(m) Ada 2 VNA 1.0 mm(f) Measurement 3: VNA 1.0 mm(m) Ada 1 Ada 2 VNA 1.0 mm(f) Numeric cascadation: Ada 1 Ada 2 Measurement 1 Measurement 2 Paper: Johannes Hoffmann et al., Traceable Calibration with 1.0 mm Coaxial Standards, ARFTG 87th, May 2016 Jürg Rüfenacht and the METAS VNA gang EMRP HF-Circuits: 6th European ANAMET

20 1 st example: 1.0 mm (male-female) adapter cascadation 1.0 mm adapter cascadation (reflection) Jürg Rüfenacht and the METAS VNA gang EMRP HF-Circuits: 6th European ANAMET

21 1 st example: 1.0 mm (male-female) adapter cascadation 1.0 mm adapter cascadation (transmission) Jürg Rüfenacht and the METAS VNA gang EMRP HF-Circuits: 6th European ANAMET

22 2 nd example: 1.85 mm (male) to 1.0 mm (female) adapter characterization Non-insertable adapter characterization: 1.85 mm (male) to 1.0 mm (female) Comparing two different adapter characterization techniques: Unknown Thru calibration (SOLR) 1-port measurement de-embedding Comparing two calibration kit standard definitions concepts: Keysight (generic and ignoring the systematic connector effects) METAS (serialized and including the systematic connector effects) S11 side: 1.85 mm, 1-port optimization calibration (85058B) S22 side: 1.0 mm, 1-port optimization calibration (85059A) -> both cal kits are Offset Shorts based including an Open and Load Starting from exactly the same S-parameter raw data files! Jürg Rüfenacht and the METAS VNA gang EMRP HF-Circuits: 6th European ANAMET

23 2 nd example: 1.85 mm (male) to 1.0 mm (female) adapter characterization Keysight definitions (generic and without the systematic connector effects) - 1-port de-embedding - Unknown Thru cal Jürg Rüfenacht and the METAS VNA gang EMRP HF-Circuits: 6th European ANAMET

24 2 nd example: 1.85 mm (male) to 1.0 mm (female) adapter characterization METAS definitions (serialized and including the systematic connector effects) - 1-port de-embedding - Unknown Thru cal Jürg Rüfenacht and the METAS VNA gang EMRP HF-Circuits: 6th European ANAMET

25 Conclusions Including the systematic connector effects results in consistent S-parameter data by using different calibration methods and different adapter characterization techniques. The accuracy of the Open, Short and Load standard definitions is most important to get a good agreement between the techniques. The 1-port measurements de-embedding adapter technique needs the least number of connections and no additional cable is needed. -> my personal favourite for a single adapter characterization! VNA Tools directly supports adapter characterization techniques: - embedding and de-embedding by mouse-click - systematic analysis (cal methods, cal definitions, uncertainties) - analysis and visualization of the resulting correlation effects Jürg Rüfenacht and the METAS VNA gang EMRP HF-Circuits: 6th European ANAMET

26 Thank you very much for your attention

27 Research project partners More information: Jürg Rüfenacht METAS Seminar, New developments in VNA metrology

28 Acknowledgment This work is partly funded through the European Metrology Research Programme (EMRP) Project SIB62 Metrology for New Electrical Measurement Quantities in Highfrequency Circuits. The EMRP is jointly funded by the EMRP participating countries within EURAMET and the European Union. Jürg Rüfenacht METAS Seminar, New developments in VNA metrology

29 1 st example: 1.0 mm (male-female) adapter cascadation (backup slide) 1.0 mm adapter cascadation Dependency Keysight versus METAS (Cal and Def) Jürg Rüfenacht and the METAS VNA gang EMRP HF-Circuits: 6th European ANAMET