Traveling-wave resonant tunnel diode (TWRTD) pulse generators comprisi
ng transmission lines periodically loaded by GaAs/AlAs resonant tunnel
diodes (RTD's) are fabricated. The TWRTD pulse generators have convol
ved transition times of 3.5 ps when measured with an active probe. Usi
ng identical RTD's, TWRTD pulse generators can attain smaller transiti
on times than those obtained with switching circuits employing a singl
e RTD.