Design Of Voltage Regulator For Providing Operational Voltage Of Memory Chip

In recent years, due to continuous improvement of CMOS technology and the need for low cost, the maximal allowable supply voltage has been scaled down gradually in the analog and digital integrated circuits. Because it can produce variously stable output voltage, regulators have been used in analog circuits widely.It is well known that memories are always named as driver and leader of IC technology. And memories developed very quickly. Memories' density and technology are most advanced in all integrated circuits. Also memories are used the most widely. The circuits require that the operational voltages of memories must be stable (voltage does not vary with temperture and it can reject noise which come from all kinds of envioments) and have large driving capabilities. So, in this papper we have designed a voltage regulator by which can provide a stable voltage for all memories.With the improvement of CMOS technology, the density of unit area in IC chips is more and more high. So the power of chips and the internal parasitic effect have been projected. Not only regulator can transform a constant voltage to some kinds of various voltages, but also the transformed voltages must be not changeable with temperature changing (i.e. zero temperature coefficient). And it should be stable though the power supply is not immune. So the art of regulator design should be more challenging.Voltage regulators are analog circuits. Firstly, we introduced usages and developing situations of analog integrated circuits and the different design skills between analog and digital circuirs. This article secondly makes a detailed analysis and expatiation for the operational principle and design technique of regulator. Then realize the regulator design in two different ways (stable RC network and variable RC network), and accomplish the simulation using MXIC 0.35m process by HSPICE. Finally the author has compared two ways, obtaining satisfying results.