2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/161750We investigate an optimal regime of negative-valued conductance, emerging in a resistively and capacitively shunted Josephson junction, which is driven simultaneously by both, a time-periodic (ac) and a constant (dc) current. We analyze the current-voltage characteristics in the regime of absolute negative conductance. We additionally explore the stability of the negative response with respect to the ac-current frequency.10 pages, 4 figures, Presented at the 20th Marian Smoluchowski Symposium on Statistical Physics, Krakow, September 22-27, 2007; Acta Phys. Pol. B 2008 (in press)SuperconductivityStatistical Mechanicstext