SIMULATION OF A SUBHARMONIC EXCITATION OF SERIES INTEGRATED RESONANT-TUNNELING DIODES

A subharmonic pulse excitation of an oscillator of series-integrated R TD's is considered and simulated. Linearized considerations are used t o analyze the nonlinear system dominated by two major frequencies. A v oltage-dependent current source is adopted to separate the input and o utput power for convenient simulation. Simulations show, for example, a 100-GHz integrated RTD oscillator can be excited by a 50-GHz pulse w ith 1-ns decay time without the dc instability problem, while a voltag e ramp of 1-ns rise or fill time is far too slow to initiate such an o scillator.