A GaAs monolithic time-domain reflectometer (TDR) for millimeter-wave network analysis has been fabricated. The TDR has two outputs from which the incident and reverse waves can be determined. The two channels show 2.3-ps falltime and a 150-GHz 3-dB TDR bandwidth. The reflection coefficient in the time domain obtained after a partial calibration clearly indicates a prominent reflection when the TDR is under open-circuit load.
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