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Precision resistor

A variety of applications require the development of highly precise resistances, which do not vary beyond prescribed tolerances over an acceptable temperature range. Integrated circuit resistors are well-known. Precision resistors are often used in integrated circuit applications that require high stability and accuracy. Applications specific integrated circuits (ASICs) often require small value precision resistors to achieve circuit matching. Small value precision resistors are difficult to manufacture because parasitic end resistances are often comparable to the value of the controlled resistance. Precision resistors for use in critical applications such as instrumentation, computers, and military electronics were wirewound because wirewound resistors have great stability and reliability. However, wirewound resistors are difficult to produce, their have relatively large size and limited resistance range. Precision resistors have also been made of thin films. The thin film resistors of the prior art can be divided into two principal classes based on the technique used to adjust resistance value. Each has its own problems. Thin film resistors are often used in precision analog-to-digital and digital-to-analog integrated circuits for precision data conversion, which may require precise control of the resistance of the thin film resistor over the operating temperatures. Often the final fine control of the resistance of these precision thin film resistors must be done using laser trimming.

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