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. 2016 Apr 5;6:23967. doi: 10.1038/srep23967

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(a) CRS stack, equivalent circuit and switching scheme for Minimum gate. (b) Is the reversed CRS stack with corresponding equivalent circuit and the resulting switching scheme for Maximum gate. Next to the purple colored ideal I-V curve, the actual CRS state is indicated by a resistance scheme. The threshold voltages V_th,1, V_th,2, V_th,3 and V_th,4 specify where the BC/TC resets/sets.