التصغير - الاغشية الرقيقة - نظرة الى المستقبل .. الالكترونيات

Miniaturization - Thin Films - A Look to the Future .. Electronics

Miniaturization

It is known that the elements and components of the circuit such as resistors, capacitors and inductors have terminals that occupy a significant space in the circuit. Instead, the materials that resist current can be deposited directly on an insulated plate and between the conductors (290). The resistors are usually very precise, and their value can be controlled to a very high degree. In cases that require greater precision, the resistors are manufactured with values ​​slightly less than the required value, and then their value is increased by cutting a part of them or by drilling them.

Ordinary capacitors are composed of rolled aluminum foils separated by an insulating body such as mica, or they are made of insulating plates on which a material is deposited. In this way, very thin capacitors can be made (291) consisting of a conductive or deposited layer and an insulating surface B or an electro-permeable one. Then another conductive layer C is added to the insulator and a capacitor is obtained consisting of a conductive. Surfaces A, B.

Thin Films

The "ground" of microcircuits is formed from a base or insulating plate that has no roughness that causes irregular deposits, so ceramic, glass or any other smooth ground is used for this purpose.

290 - Thin film resistors.
291 - Thin film capacitors.
292 - Thin film resistor circuit.
293 - Thin film capacitor circuit and its equivalent circuit.

Nickel and chromium alloys are used to deposit resistors, which are fine wires that can be given all shapes and can be branched if necessary (292).

One of the methods used is to cover a ground chip with paint or a light-sensitive material, so that the nickel and chromium can be deposited in their specific place after the circuits are printed on the insulating plate.

Capacitors can be made by depositing aluminum, then the insulator, then aluminum again. The insulating body may be composed of magnesium fluoride, zinc sulfide, silicon oxide, or any other material. The thinner the film, the greater the capacity and smaller the volume. The deposits can be formed to give us the desired shapes. Figure (293) shows a conductor surface A covered with insulator B and above it four surfaces C, making it four capacitors instead of one.