| 摘要 |
<p>PURPOSE:To avoid the effects of noises generated in switching of output transistors by arranging voltage amplifier circuits at position which are far from one side wherein the output transistors are concentrated and present, e.g. at the input side where counter electrodes in a chip for the output transistors are provided. CONSTITUTION:An input buffer 7 is arranged at the uppermost part of the upper side of a chip. Sense amplifiers 8 are arranged beneath the input buffer 7. Column switches 6 are arranged between the sense amplifiers 8 and memory matrixes 4. Output buffers 9 are arranged beneath the memory matrixes at the lower side. Output transistors 10 are arranged at the lowermost part. In this circuit arrangement, the output transistors 10 which are noise sources and the sense amplifiers 8 for amplifying minute voltages are separated in distance. Therefore, the spike noises which are generated by the switching of the output transistors due to the impedances of the power-supply wirings and the substrate between the transistors and the amplifiers are attenuated during the transmission to the sense amplifiers 8. Namely, the effects of the noises generated in switching of the output transistors 10 are hard to receive.</p> |
