Patent ID: 8547138
Filing Date: 2013-10-01
Classification: G11C,H03K

Abstract:
1. A semiconductor device comprising: a first input buffer having a logic threshold voltage; a first replica circuit being identical in circuit configuration to the first input buffer, the first replica circuit having an input and an output, the output being connected to the input to generate an output voltage, the first replica circuit comprising a plurality of current paths between the output of the first replica circuit and a voltage line for the current paths; a first reference voltage generating circuit that generates a first reference voltage; and a first comparator circuit that compares the output voltage of the first replica circuit to the first reference voltage to generate a first threshold adjustment signal, so that the first input buffer and the first replica circuit are operated based on the first threshold adjustment signal, to adjust the logic threshold voltage of the first input buffer by controlling the plurality of current paths by the first threshold adjustment signal.