Introduction of Thin Film Resistors

Thin film resistor is made by using a certain resistor materials deposited on the surface of the insulating materials with vacuum evaporate plating technology, generally this resistor uses insulation materials like ceramic wafer.

Thin film resistors has island structure, mesh structure, continuous structure. The materials are metal, metal alloy, etc.

In recent years, with rapid growth of electronic information technology, A/D, D/A change-over circuit and other linear and non-linear circuits are developing daily. High precision operational amplifier coring on thin film resistors website and A/D, D/A change-over circuits are essential. In order to improve precision and definition of ADC and DAC, the performance of thin film resistors should be improved as well.

DAC and ADC precision and definition are determined the resistor network of component interior. Resistor network performance analysis and production are the key technologies of simulating device development and production. High precision resistors have high resistance value, low TCR, high stability, no parasitic effects and low noise, etc, widely used in aviation, national defense, computer, communications equipment, electronic switches and other high-tech fields.

The formation of a thin film is essentially a gas-solid transformation, a process of crystal formation. It can be roughly divided into the following major steps: atoms or molecules impinge on the surface of a solid; they are absorbed by atoms on a solid surface or directly back into space; the adsorbed particles migrate or diffuse on the solid surface and move to the appropriate lattice sites on the surface and into the lattice. These processes and the interrelationships between them determine the film formation process and the properties of the film.

In general, the resistor film contains up to three types of phase components: the insulating phase, the semiconductor phase and the conductive phase. In modern resistor films, these phases are often finely distributed and some are even linearly distributed, because the coarsely dispersed structure makes the film poor performance.

According to the conductive phase or the semiconductor phase in the resistor film in the fine distribution, the film has such three structures: island structure, mesh structure and continuous structure. The island structure means that the conductive particles are finely dispersed in the island in the film, and thus each particle is surrounded by the insulating phase. Mesh structure is the conductive particles connected to each other into a conductive network, in the network hole is insulated phase. The continuous structure is that conductive particles closely packed into a continuous film, seldom containing the insulating phase.