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DC - 725 GHz sampling circuits and subpicosecond nonlinear transmission lines using elevated coplanar waveguide

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3 Author(s)
Bhattacharya, U. ; Dept. of Electr. & Comput. Eng., California Univ., Santa Barbara, CA, USA ; Allen, S.T. ; Rodwell, M.J.W.

Nonlinear transmission lines (NLTL's) fabricated with Schottky diodes on GaAs were used to electrically generate 3.7-V step functions that had a measured 10%-90% fall time of 0.68 ps. These NLTL's were integrated on wafer with sampling circuits that had a measured 3-dB bandwidth of 725 GHz. Key to circuit performance are the use of low-loss, high-wave-velocity elevated coplanar waveguide transmission lines and the elimination of active device pad parasitics by contacting devices above the plane of the wafer.<>

Published in:

Microwave and Guided Wave Letters, IEEE  (Volume:5 ,  Issue: 2 )