| 摘要 |
<p>An antifuse (110) is programmed by passing current pulses (210.1, 210.2, 210.3, 210.4) of the opposite polarity through the antifuse. In some embodiments, the magnitude of the second pulse (210.2) is lower than the magnitude of the first pulse (210.1). If the antifuse has one electrode (136) on top of the other electrode (114) and on top of a semiconductor substrate, the current during the first pulse flows from the top electrode to the bottom electrode. A programming circuitry to program antifuses (414-i,j) in a programmable circuit (410) includes a driver circuit (430L.i, 430T.i, 430R.i, 430B.i) connected to each 'horizontal' channel (418.i) and each 'vertical' channel (420.i). The driver circuits are connected into shift registers so that the data controlling the driver circuits can be entered from one, two, three or four inputs (458L, 458T, 458R, 458B). No decoding circuitry is necessary. Before programming, the driver circuits precharge all the channels to an intermediate voltage. During programming, the channels not directly connected to the antifuse being programmed are switched to high impedance.</p> |
