Abstract
Ultrashort pulse generations were demonstrated on two types of resonant tunneling diode (RTD) pulse generators. The circuits were fabricated with InGaAs/AlAs RTDs on an InP substrate. One of the circuits was a simple resistor-RTD series circuit, and the other was a circuit consisting of an RTD pair. The full widths at half maximum (FWHMs) of the pulses were about 10 ps. Good symmetric opposite polarity peaks were obtained for the resistor-RTD pair circuit, while the peaks for the resistor-RTD series circuit were asymmetric. Moreover, the simple resistor-RTD-type pulse generator was integrated with antennas on ceramic substrates. A sending and receiving experiment showed that a 70 GHz wave packet was transmitted between antennas.
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