Author: Eduardo L. Acuna Company: TDK Corporation of America Date Published: 9/10/1996
Surface Mount International
Abstract: The rapid development of commercial high frequency, large ban width, signal encoded communication technologies is prompting a phenomenal growth in inductor development. Inductors made from new materials and imaginative construction methods are flooding the industry with a wide array of choices for the RF design engineer. This paper provides a basic understanding of these materials and construction methods. The goal is to acquaint the RF design engineer with the benefits and demerits of these components. Specifically, the tradeoffs involved in choosing a component. Thin film mukilayer, and wirewound constructions are examined with a bias towards high frquency performance. Appropriate component characterization and vendor interchangeability at the frequencies of operation play an integral role in component selection. This paper views some existing measuring techniques used by inductor vendors and original equipment manufacturers (OEM). The goal is to describe potential gaps in characterization information which may affect component selection. Finally this paper attempts to present a rudimentary guideline for selecting the appropriate inductor technology for an application. The framework for this selection process is cost, performance, and manufacturability. This paper will focus on fixed inductance components. There is a full variety of variable inductors available as well. These will not be discussed in this paper except to mention their existence. These variable constructions are more expensive than the fixed value ones. While there are still many applications that require a final adjustment via a variable inductor, designers should be aware of the great potential cost savings obtained by the replacement of a variable inductor with a fixed value type. The savings extend beyond component cost and relate mom directly to process cost. Therefore material type and quantity m determinate of rated current. In most high frequency inductor applications current is not a factor.