Fully automated large form factor (2′ X 3′) four-port differential 20 Ghz vector network analyzer test system with real time link characterization

We present the hardware, software, and operational details of a fully automated robotic flying head tester capable of measuring 4-port S-parameters on large (up to 2´times3´) printed wiring boards (PWBs). The system features real-time complex compliance testing based on frequency domain analysis, time domain analysis, and/or a Fourier-transform-based technique enabling very rapid time domain link simulation of measured nets in a complete system environment. The system is equipped with a flexible, compliant-pin, differential probe design that supports frequencies up to 6 GHz. The system employs a corresponding SOLT-based calibration method that places the calibration references plane at the probe tips.