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3 .- Fully Configurable ASIC

A fully configurable ASIC have probably all configurable logic elements and additionally all layers are configurable. A microprocessor is an example of a fully configurable integrated circuit, it's designers spend many hours to fully configure a section of no more than one square micron.

In this type of ASIC's can design one or all of the logic cells, the circuitry and layout specifically for ASIC [4]. This option allows the designer to ignore the proven ease of use and precaracterizadas cells for all or part of the design. This is profitable only if the logic cells available in the bookstores do not have desirable properties such as speed of calculation or if the cell is very large and consume much energy, may be the case that just any of the designs available cells of the files or libraries to serve the desired purpose. Fewer fully configurable IC's are designed as there are problems with certain special parts of the ASIC that are very difficult to handle.

Historically bipolar technology has been used for precision analog functions. The rationale for this is that all integrated circuits mating features between the different components of IC's is bad, but between the components of the same IC's is excellent. To enhance the difference between them are processed silicon wafer lots where there are several thousands of IC's at the same time with minimal differences in mating with each other.

Mating between transistors is crucial for the operation of a circuit. For the design of IC's should be located transistor pairs side by side. Device physics dictates that a pair of bipolar transistors could always breed more than CMOS transistors of the same size.

bipolar technology is used for the design of ASIC's fully configurable analog because it provides better accuracy. Although the reality is different, despite the bad properties of the use of CMOS technology for analog electronics use has increased two reasons for this are:

• technology is more available IC's manufacturing market, many ASIC's are built on this technology.
• allows much higher level of integration as required analog and digital functions within a single IC.

For this reason it's ASIC designers have found ways to implement analog functions in CMOS technology using techniques that take advantage of the accuracy of the bipolar analog designs, called BiCMOS technology.