Characterization of a hard-type oscillator using series-connected tunnel diodes

Abstract

We characterize the bifurcational structure of the recently proposed hard-type oscillator using tunnel-effect devices. Such an oscillator succeeds in suppressing the spurious oscillation occurred in the bias line and exhibits large oscillation amplitude by device cascade, so that it has significant advantages for stable high-frequency signal generation. For experimental demonstration, we fabricate a test oscillator using tunnel diodes. Through bifurcational analyses, the test oscillator is shown to exhibit hard-type oscillation. We then carry out several time-domain measurements and succeed in confirming the advantages of the oscillator.