Abstract: A pulse train generator is formed of a series of cascaded stages, each of which operates in response to pulses to generate twice as many output pulses with the same spacing and height. Each stage is formed of a transmission line network and a MESFET amplifier. The input gate of each MESFET is shunted by a matching resistor while the output of the MESFET is coupled to the transmission line network through the drain terminal. The transmission line network is substantially matched to the combined impedance of the load resistor and the MESFET. The generator may be arranged to generate radio frequency waveforms.

Abstract: A controlled interval pulse train generator comprising a plurality of three terminal transferred electron logic devices, and a delay line. The generator produces a train of small pulse-width voltage pulses at intervals determined by the delay line. The pulse train is started in response to an initial pulse and is terminated in response to a voltage step.

Abstract: A varactor tuning apparatus for tuning a strip transmission line radio frequency device, wherein the device having predetermined operating characteristics includes an active element such as an avalanche diode and a resonant conductive strip section. The tuning apparatus comprises a separate varactor circuit having a varactor mounted on a dielectric substrate including a resonant conductive strip. The varactor circuit is RF coupled to the strip transmission line of the device to provide for tuning the device by varying the reactance of the strip transmission line by electrically changing the capacitance of the varactor.