RF Chip Ind ductor A Applicattions December 2011
Ap pplicatio on Note
RF chip inducttors are an integral parrt of many d filtering cirrcuits and a are mainly u used in the tuning and RF circuits s in electron nics system ms. With a ssmall footprint an nd rugged cconstruction n, they provvide a cost-effective so olution for d densely paccked PC bo oard designs tha at are found d in RF and d wireless communica ation, comp puters, telecommunica ations and automotive e electroniccs applicatio ons. Offe ered in sma all sizes with h high Q va alues, monolithic constructio on providess stable, low w-loss inductance e over broad d frequenciies. RF chip p inductorss also offer inductance i tolerance rrated at + 1 10% of the specified frrequency. T The rated o operating cu urrent is based on the t maximu um sustaine ed current a applied, while main ntaining the specified m minimum in nductance (L). Now w that the o operational frequenciess of electronic products p arre higher an nd higher, a and the products th hat incorporrate RF circcuits into bo oard-level designs arre more and d more pop pular like ce ell phones, the applica ation of RF chip inducttors has seen a wide and rapid growth. g
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RF Chip C Indu uctor Ap pplicatio ons RF R chip induc ctors are an integral part of many tu ning and filte ering circuitss. The chip inductors s reduce or eliminate e ele ectromagnetic interferen ce (EMI) noise on the printed circuitt board (PCB). Mainly used in the RF circuits in electroniccs systems, tthey are ava ailable in sm mall ction also prrovides stable, low-loss inductance o over sizes with high Q values. Monolitthic construc broad fre equencies. The T reduced footprint acc commodatess the ever-in ncreasing re eduction in current form facttors and boa ard-level systtems.
Chip Ind ductor Type es
There T are thrree (3) types s of RF chip inductors tha at are based d on the matterial and strructure feature: •
Multilayer M chip inductor
•
Wire W wound chip c inductorr
•
Thin T film chip p inductors The T multilaye er and wire wound w chip inductors ha ve two (2) tyypes of ferritte and ceram mic
chip indu uctors with almost the sa ame manufacture processs. All of the em possess RF Inductorr Paramete ers that inclu ude: L-induc ctance, DCR R-DC resistan nce, rated current, Q facctor and SRF.
Self-Res sonant Freq quency (SRF F)
The T inductor’s Self-Resonant Freque ency (SRF) iss the freque ency where the inductor and parasitic capacitor am mong coil wiindings reso onates as sh own in equivvalent circuit below. The e higher the SRF, the higher h the in nductor’s effe ective opera ational freque ency range.
The T operation n frequency selected forr the inducto or should be lower than tthe SRF. Generally y speaking, the large ind ductance ha as a low SRF F since the sstray C is inccreased with h the wire wou und number.
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Q Factorr The T Q factor is defined as s the following formula, where R is iits internal e electrical resistanc ce and ωL is s capacitive or o inductive reactance a at resonance e:
ductors have e better perfo ormance forr narrow ban nd filtering, a amplifier, and d The high Q factor ind Below detailss the Laird oscillatorr application. The Q factor is the function of the ffrequency. B Technolo ogies 603 ce eramic chip inductors Q versus the ffrequency cu urve.
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RF Chip Inductors Features F Ta able
RF Chip Inductor Application
RF R chip induc ctors mainly have four (4 4) applicatio ons including g frequency ffilter, RF cho oke, oscillatorr and impeda ance matching circuits. They T are wid dely used in the RF equipment like ccell phones, base station ns, satellite receivers, r WLANs, W set to op boxes, GPS and CAT TV, etc.
Summarry
and produce As A electronics s systems co ontinue to be designed a ed with slimm mer profiles,, implementation of sm mall form fac ctor board-le evel EMI sup ppression co omponents iss more vital tthan or monolithic c constructio on provides sstable, low-loss inductan nce over bro oad ever. RF chip inducto frequenc cies. Laird Te echnologies can provide e a series of RF chip inductors, inclu uding multila ayer chip indu uctors, wire wound w chip inductors i an nd thin film cchip inductorrs, which are e widely utilizzed in the electronics marke et. The inductors offer in nductance to olerance rate ed at + 10% of the specified cy and incorp porate small footprint and rugged co onstruction th hat accomm modates toda ay’s frequenc electronic cs applicatio ons.
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About Laird Technologies, Inc. Laird Technologies designs and manufactures customized, performance-critical products for wireless and other advanced electronics applications. The company is a global market leader in the design and supply of electromagnetic interference (EMI) shielding, thermal management products, specialty metal products, signal integrity components, and antenna solutions, as well as radio frequency (RF) modules and wireless remote controls and systems. Custom products are supplied to all sectors of the electronics industry including the handset, telecommunications, data transfer and information technology, automotive, aerospace, defense, consumer, medical, mining, railroad and industrial markets. Laird Technologies, a unit of Laird PLC, employs over 12,000 employees in more than 49 facilities located in 16 countries.
Contact Information For additional information, visit http://www.lairdtech.com or contact us at: Americas: +1-800-634-2673 option 1 or SIP-
[email protected] Europe: +420-488-575277 or +44-(0)-7545-208008, or
[email protected] Asia: +86 757 2563 8860 or
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Trademarks © 2011 All rights reserved. Laird Technologies and its logo are trademarks of Laird Technologies, Inc. Other products, logos, and company names mentioned herein, may be trademarks of their respective owners.
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