| 摘要 |
The invention relates to a circuit arrangement comprising a bit line (10), a reference bit line (12), a sense amplifier equipped with two cross-coupled CMOS inverters, each of the latter having an n-channel transistor (20, 22) and a p-channel field effect transistor (30, 32), in addition to two respective voltage sources (40, 42) at the source connections, the voltage source (40) that is connected to the n-channel field effect transistors being traversed by a voltage rising from low to high and the voltage source (42) that is connected to the p-channel field effect transistors (30, 32) being traversed by a voltage reducing from high to low. Said circuit arrangement allows three different charge states to be stored in the memory cell (4) on the bit line (10), if the cut-off voltages (UTH1, UTH2) in the transistors are selected to be greater than half the voltage differential between the lower and upper voltage potential. This can be achieved technically during production or for example by the modification of the substrate bias voltage. The third charge state can be used for binary logic or to detect a defect in the memory cell (4). |
