Figure 7

(a) URS can be induced by increasing the voltage after ①reset of BRS under set-CC of 5 mA. The ②URS set was induced under set-CC of 5 mA (the same as BRS) and ③URS reset was induced without current compliance. (b) 60 switching cycles for URS under the 5 mA set-CC. (c) Double switch model explains the URS as the inversed polarity of the switch S2 in high voltage and the current-driven reset.