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Send til en ven   Udskriv3/1 2012 kl. 14:44
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Laird sætter fokus på brug af RF chipinduktorer

Laird Technologies har publiseret RF chipinduktor applikationsnote, der beskriver brugen af chipinduktorer i tuning- og filterkredsløb (in english).

Laird Technologies, Inc., a global leader in the design and supply of customized performance-critical components and systems for advanced electronics and wireless products, today announced the publication of its newest application note titled 'RF Chip Inductor Applications'.
 
The application note explains how RF chip inductors are an integral part of many tuning and filtering circuits. Mainly used in the RF circuits in electronics systems, they reduce or eliminate electromagnetic interference (EMI) noise on the printed circuit board (PCB). The RF chip inductors are available small sizes with monolithic construction. This provides stable, low-loss inductance over broad frequencies in a small footprint.
 
There are three different types of chip inductors listed in the paper: multilayer, wire wound, and thin film. These chip inductors possess RF Inductor Parameters that include: L-inductance, DCR-DC resistance, rated current, Q factor and Self-Resonant Freque

ncy (SRF).
 
The application note then examines the SRF and Q factor. The SRF is the frequency where the inductor and parasitic capacitor among the coil windings resonates. The higher the SRF, the higher the inductor’s effective operational frequency range. The Q factor is the function of the frequency. High Q factor inductors have better performance for narrow band filtering, amplifier, and oscillator application.
 
A table is included that compares the different features of the three chip inductors, while their four applications are listed: frequency filter, RF choke, oscillator and impedance matching circuits.
 
As electronics systems continue to be designed and produced with slimmer profiles, implementation of small form factor board-level EMI suppression components is more vital than ever. RF chip inductor monolithic construction provides stable, low-loss inductance over broad frequencies. The inductors offer inductance tolerance rated at + 10% of the specified frequency and incorporate small footprint and rugged construction that accommodates today’s electronics applications.
 
Laird Technologies is a leading global supplier of signal integrity products that meet the demands of any application by providing the very best solution. These products are designed for power and data line EMI filtering where high current, small size or high frequency performance is required.
 
The application note is available free for download on http://www.lairdtech.com 

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