True Differential Superconducting On-Chip Output Amplifier.
2021
The true-differential superconductor on-chip amplifier has complementary outputs that float with respect to chip ground. This improves signal integrity and compatibility with the receiving semiconductor stage. Both source-terminated and non-source-terminated designs producing 4mV demonstrated rejection of a large common mode interference in the package. Measured margins are $\pm$8.5% on the output bias, and $\pm$28% on AC clock amplitude. Waveforms and eye diagrams are taken at 2.9-10Gb/s. Direct measurement of bit-error rates are better than the resolution limit of 1e-12 at 2.9Gb/s, and better than 1e-9 at 10Gb/s.
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