DEFINITION OF SSI MSI LSI VLSI PDF

These circuits are called discrete circuits and they have following disadvantages: In a large electronic circuit, there may be very large number of components and as a result the discrete assembly will occupy a very large space. They are formed by soldering which causes a problem of reliability. To overcome these problems of space conservation and reliability, the integrated circuits were developed. Integrated Circuit IC. An IC comprises a number of circuit components like resistors, transistor etc. They are interconnected in a single small package to perform the desired electronic function.

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These circuits are called discrete circuits and they have following disadvantages: In a large electronic circuit, there may be very large number of components and as a result the discrete assembly will occupy a very large space. They are formed by soldering which causes a problem of reliability.

To overcome these problems of space conservation and reliability, the integrated circuits were developed. Integrated Circuit IC. An IC comprises a number of circuit components like resistors, transistor etc. They are interconnected in a single small package to perform the desired electronic function. These components are formed and connected within a small chip of semiconductor material. In IC the following features are observed. In IC, the various components are integral part of a small semiconductor chip and the individual components cannot be removed for repair and replacement as in discrete circuits.

It combines both active elements like diodes and transistors with passive components like resistors and capacitors in a monolithic structure, so the complete unit in a monolithic circuit. Their size is very small. To see connections between their various components, a microscope is needed. All the components are formed within the chip and no components is seen projected above the surface of the chip.

C can work on low voltages. They can handle limited amount of power. They are very small in size They are cheap Complex circuitry on a chip may be used to obtain improved performance characteristics. Discrete Circuits Discrete circuits require comparatively more voltage. Discrete circuits can handle much more power than IC. Circuit with discrete components acquires large space. The performance is not good. Fabrication Of Components Usually electronics components such as diodes, resistors and capacitors are made on monolithic integrated circuit IC.

In order to fabricate these IC components impurities are added or diffused in specific place in the semiconductor wafer i.

All the four components are made inside the P-type substrate or wafer. N-type and P-type portion are made from N-type and P-type materials inside the P-type substrate. However this is done by diffusion process. In this process P-type and N-type materials in the form of gas are added in semiconductor wafer at high temperature.

Wafer is placed in a high temperature, furnace of about o C At first a thin layer of silicon diode SiO2 layer is made at particular areas of N-type layer which are subject to diffusion.

The N-type material is diffused in to substrate. Now the first and large N-type potion is diffused inside the substrate. Again a thin layer of SiO2 is grown over the other new place is selected to diffuse P-type material inside the N-type material. This same process is repeated to diffuse last potion of N-type material.

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SSI, MSI, LSI, VLSI & ULSI

Mutaxe Industrial CT scanning can also be used. Wikimedia Commons has media related to Integrated circuit. Major fields of computer science. Database management system Vlwi storage systems Enterprise information system Social information systems Geographic information system Decision support system Process llsi system Multimedia information system Data mining Digital library Computing platform Digital marketing World Wide Web Information retrieval. The success of ICs has led to the integration of other technologies, in an attempt to obtain the same advantages of small size and low cost.

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DEFINITION OF SSI MSI LSI VLSI PDF

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