Please wait, while we are loading the content...
Please wait, while we are loading the content...
| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Kondo, K. Takahata, O. Ono, H. Yoshida, S. Yamaguchi, M. |
| Copyright Year | 1965 |
| Abstract | A lead frame in a large-scale integration (LSI) package, which should be a path of electromagnetic noise conduction, was coated with ferrite-plated films in order to suppress the electromagnetic interference (EMI) found inside recent electronic devices. A lead frame with 80 pins and a pin pitch of 0.65 mm was mounted on a rotating table, onto which a reaction solution of FeCl2 + NiCl 2 +ZnCl2 and an oxidizing solution of NaNO 2 +CH3COONH4 were simultaneously sprayed at 90 degC. The ferrite film on every surface of the lead frame had nearly the same thickness of around 3 mum with a definite columnar structure aligned perpendicular to the film plane. This suggested that the aqueous solution sprayed on the top surface of each pin flowed down to reach not only the lateral sides but also the back side under the optimum plating condition. Noise suppression effects of the ferrite films were predicted using an electromagnetic field simulation. In order to examine the influence of permeability on the noise suppression effect, the measured permeability spectra of films A (Ni 0.2Zn0.6Fe2.2 O4) and B (Ni0.2 Zn 0.3Fe2.5O4 ) with natural resonance frequencies (f r s) around 0.05 and 0.35 GHz, respectively, were employed for the calculation. The calculated loss power ratio P loss/P in of the ferrite films exhibited similar frequency dependences to those of the product of the measured imaginary permeability mu '' and the frequency f(mu'' x f) for both films. The loss power ratio P loss/P in for Film B, which had a higher f r, was higher than that for Film A above and around the cross point of their mu'' x f. This indicated that magnetic loss was the predominant factor in P loss/P in. For Film B, P loss/P in was almost the same as that without ferrite films around 0.1 GHz, where P loss/P in began to rise. This meant that the insertion loss was negligibly small. In addition, the harmful effect of the ferrite films on signal transmission due to an increase of reflection parameter S 11 was weak enough for both films. The simulation results described above suggested that the lead frame equipped with a low-pass filter having an intended cut-off frequency can be obtained by changing the permeability spectrum, i.e., chemical composition of the ferrite film. |
| Sponsorship | IEEE Magnetics Society |
| Starting Page | 4250 |
| Ending Page | 4252 |
| Page Count | 3 |
| File Size | 629939 |
| File Format | |
| ISSN | 00189464 |
| Volume Number | 45 |
| Issue Number | 10 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2009-10-01 |
| Publisher Place | U.S.A. |
| Access Restriction | One Nation One Subscription (ONOS) |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Electromagnetic interference Large scale integration Ferrite films Magnetic films Electronics packaging Spraying Frequency measurement Permeability measurement Zinc Iron lead frame Complex permeability electromagnetic interference ferrite-plated film |
| Content Type | Text |
| Resource Type | Article |
| Subject | Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering |
National Digital Library of India (NDLI) is a virtual repository of learning resources which is not just a repository with search/browse facilities but provides a host of services for the learner community. It is sponsored and mentored by Ministry of Education, Government of India, through its National Mission on Education through Information and Communication Technology (NMEICT). Filtered and federated searching is employed to facilitate focused searching so that learners can find the right resource with least effort and in minimum time. NDLI provides user group-specific services such as Examination Preparatory for School and College students and job aspirants. Services for Researchers and general learners are also provided. NDLI is designed to hold content of any language and provides interface support for 10 most widely used Indian languages. It is built to provide support for all academic levels including researchers and life-long learners, all disciplines, all popular forms of access devices and differently-abled learners. It is designed to enable people to learn and prepare from best practices from all over the world and to facilitate researchers to perform inter-linked exploration from multiple sources. It is developed, operated and maintained from Indian Institute of Technology Kharagpur.
Learn more about this project from here.
NDLI is a conglomeration of freely available or institutionally contributed or donated or publisher managed contents. Almost all these contents are hosted and accessed from respective sources. The responsibility for authenticity, relevance, completeness, accuracy, reliability and suitability of these contents rests with the respective organization and NDLI has no responsibility or liability for these. Every effort is made to keep the NDLI portal up and running smoothly unless there are some unavoidable technical issues.
Ministry of Education, through its National Mission on Education through Information and Communication Technology (NMEICT), has sponsored and funded the National Digital Library of India (NDLI) project.
| Sl. | Authority | Responsibilities | Communication Details |
|---|---|---|---|
| 1 | Ministry of Education (GoI), Department of Higher Education |
Sanctioning Authority | https://www.education.gov.in/ict-initiatives |
| 2 | Indian Institute of Technology Kharagpur | Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project | https://www.iitkgp.ac.in |
| 3 | National Digital Library of India Office, Indian Institute of Technology Kharagpur | The administrative and infrastructural headquarters of the project | Dr. B. Sutradhar bsutra@ndl.gov.in |
| 4 | Project PI / Joint PI | Principal Investigator and Joint Principal Investigators of the project |
Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon |
| 5 | Website/Portal (Helpdesk) | Queries regarding NDLI and its services | support@ndl.gov.in |
| 6 | Contents and Copyright Issues | Queries related to content curation and copyright issues | content@ndl.gov.in |
| 7 | National Digital Library of India Club (NDLI Club) | Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach | clubsupport@ndl.gov.in |
| 8 | Digital Preservation Centre (DPC) | Assistance with digitizing and archiving copyright-free printed books | dpc@ndl.gov.in |
| 9 | IDR Setup or Support | Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops | idr@ndl.gov.in |
|
Loading...
|