The high-speed test setup includes several important pieces of equipment. The sample is mounted on the end of a 20 GHz bandwidth high-speed probe. The end of the probe is surrounded by two mumetal shields and is immersed in a liquid helium dewar. The clock is generated by the synthesizer signal generator and, for voltage-state superconducting logic testing, a three phase clock is obtained using the power splitters and phase shifters. The three clock phases are then amplified using HP microwave amplifiers. 1 GHz digital inputs can be generated by the HP 80,000, and higher speed data is generated using the HP 71612A 12 Gb/s data generator. The circuits outputs are observed on a Tektronix sampling oscilloscope. Bit Error Rate Testing (BERT) is also possible.
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