Title :
DC - 725 GHz sampling circuits and subpicosecond nonlinear transmission lines using elevated coplanar waveguide
Author :
Bhattacharya, U. ; Allen, S.T. ; Rodwell, M.J.W.
Author_Institution :
Dept. of Electr. & Comput. Eng., California Univ., Santa Barbara, CA, USA
Abstract :
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.<>
Keywords :
Schottky diodes; coplanar waveguides; function generators; gallium arsenide; submillimetre wave diodes; submillimetre wave integrated circuits; 0 to 725 GHz; 0.68 ps; 3.7 V; 725 GHz; GaAs; Schottky diodes; THF; broadband sampling circuits; coplanar waveguide; elevated CPW; step functions generation; subpicosecond nonlinear transmission lines; Bandwidth; Circuit optimization; Distributed parameter circuits; Electric variables measurement; Gallium arsenide; Integrated circuit measurements; Sampling methods; Schottky diodes; Time measurement; Transmission line measurements;
Journal_Title :
Microwave and Guided Wave Letters, IEEE
