Hi all, Can any one recommend a manufacturer of pulse generators with rise times in the femtosecond or low picosecond range? I have already tried Agilent, Keithley, Picosecond Pulse labs, and Tektronix. Thanks, -- EVELYN BENABE Graduate Research Assistant RF Microsystems Research Group University of South Florida 4202 East Fowler Avenue Tampa, FL 33620 Office: ENB 412 Office Phone: (813)-974-4851