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Multiport Calibration

Multiport Calibration. ATE Architecture, Design and Support. What We Do. Solve challenging high-speed and microwave measurement problems, providing customers with accurate, reliable, and repeatable data. Fixturing Calibration & Error Correction Reference Plane Positioning.

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Multiport Calibration

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  1. Multiport Calibration ATE Architecture, Design and Support

  2. What We Do Solve challenging high-speed and microwave measurement problems, providing customers with accurate, reliable, and repeatable data

  3. Fixturing Calibration & Error Correction Reference Plane Positioning

  4. Areas of Expertise Test System HW & SW Develop-ment Fixturing Measurement Science • SMT • Non-coaxial • Device-specific • RF • High-Speed • Multi-port ATE System Development Calibration & Error Correction Data Analysis • Conventional • Novel • Signal Integrity • Power Integrity

  5. Company Philosophy Simultaneously make measurement systems: Accurate Fast Simple

  6. Description of Problem • Multi-port Device Under Test • Switch Matrix & Test Cables have non-negligible loss, group delay, dispersion • Must calibrate at DUT port • Calibration must be done at least once per day • Manual calibration is time-consuming and error-prone • Time required to calibrate reduces system throughput

  7. Why It Matters • Poor (or no) calibration results in poor measurement accuracy • Poor accuracy causes • Bad parts to pass through, or • Good parts to be scrapped • Both represent real costs through • Higher-level system failures & customer relations issues, or • Increased material costs due to scrapage • Time required for calibration takes away from system throughput and must be minimized to reduce cost per tested part

  8. Conventional Approaches

  9. ATE Solution Calibrate at VNA test ports 1 Automatically characterize interconnect path in situ Calibration can be done with DUT connected 2 Measure DUT Measurement done with cal modules connected 3 FCM FCM Automatically de-embed interconnect and display data at DUT reference plane FCM FCM 4 FCM FCM FCM FCM Reference Planes Instrument Calibration Module FCM = Fixture Characterization Module

  10. VNA & ICM

  11. Fixture Characterization Module

  12. Calibration Procedure 4-Ports 2000 points IFBW = 3000Hz Calibration time = 48 sec

  13. Measurement Procedure 4-Ports 2000 points IFBW = 3000Hz Measurement time = 9 sec

  14. 2-Port Probe System Configuration Option 1 Traditional Approach ATE Approach • 2-port Calibration Process: • Press Calibrate Button • 2-port Calibration Process: • Bring Port 1 probe down on Short • Measure Short on Port 1 • Bring Port 1 probe down on Open • Measure Open on Port 1 • Bring Port 1 probe down on Load • Measure Load on Port 1 • Bring Port 2 probe down on Short • Measure Short on Port 2 • Bring Port 2 probe down on Open • Measure Open on Port 2 • Bring Port 2 probe down on Load • Measure Load on Port 2 • Bring Port 1 and Port 2 probes down on Thru • Measure Thru between Ports 1 & 2

  15. 2-Port Probe System Configuration Option 2 ATE Approach • Calibration Process: • Bring Port 1 and Port 2 probes down on Thru • Measure Thru between Ports 1 & 2 • Compared to Option 1: • Hardware configuration simplified • Does not allow calibration on-the-fly

  16. 4-Port Probe System Configuration Traditional Approach ATE Approach • 4-port Calibration Process: • Press Calibrate Button • 4-port Calibration Process: • Approximately 30 steps Switch Matrix

  17. Software: Programmatic Module Control • SCPI-based command set • TCP/IP over Ethernet • VISA compatible • Web Browser Interface to configure Module Controller • Full VISA-based LabVIEW and CVI Wrappers provided Example Command (Set FCM at module port 5 to thru state): CONTROL:FCM5:STATE THRU

  18. Software: Automated Cal with TruCal • Application Programming Interface (API) for all ATE Calibration Algorithms • Standard Win32 DLL • Callable from any language/IDE that supports DLL access (e.g. C, C++, LabVIEW, CVI, VB, etc.) • Uses rudimentary C data types for maximum compatibility • Full LabVIEW API Wrapper provided Example Function (Initialize 2-port algorithm): TC2P_Initialize(double* dFreqs, int nFreqs, int nStates);

  19. Characteristics: Automated • In situ calibration allows system to be calibrated without removing DUT and connecting standards • No manual, error-prone operations • Fast calibration improves system availability • Non-intrusive calibration allows it to be done more frequently

  20. Characteristics: Accurate • Calibration transfer standards have TRL-level accuracy • In situ calibration removes inaccuracies resulting from test cable performance with flexure of conventional cal methodologies • Fast calibration facilitates more frequent calibration as needed

  21. Characteristics: Cost-Effective • Improved accuracy avoids costs associated with shipping bad material resulting in high-level system failure and customer dissatisfaction • Improved accuracy avoids scrapping good material just when it has the maximum value-added, reducing manufacturing cost • Increased system up-time reduces cost per tested part by being able to test more devices in a shift

  22. Contact information For more information please contact us at: ATE Systems, Inc. Phone: +1-978-362-1850 85 Rangeway Road email: info@atesystems.com North Billerica, MA 01862 http://www.atesystems.com

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