RF Microwave / Thin Film

EMI Filtering for High Reliability Applications

EMI Filtering for High Reliability Applications

EMI Filtering for High-Reliability Applications Amanda Ison AVX Corporation, 11144 Penrose St, Sun Valley, CA 91352www.avx.com Electromagnetic interference (EMI), or electrical noise, is generated by everything from cellphones to solar flares and can make accurate signal transmission as difficult as trying to have a clear conversation in a noisy room. To improve signal clarity in electronic circuits, device designers turn to EMI suppression filters. Effective EMI filtering is necessary for almost every modern electronic device, including devices that generate their own EMI, as well as devices that are sensitive to EMI within their environment, and is especially important in high-reliability applications that utilize lower-power signals and have strict signal fidelity demands. High-reliability EMI filters are designed to consistently meet or

Wireless Charging

Wireless Charging

Wireless Charging Written By: Ron Demcko Abstract: Yesterday’s dream of distributing power wirelessly is becoming a reality based upon exceptional efforts of industry regulatory agencies, component manufacturers, and design engineers with long-term vision. The use of wireless charging is expected to increase dramatically as consumers are freed from carrying bulky cables that have extra weight and the potential to wear out the mechanisms associated with them. Implementation of wireless charging schemes are easier than ever thanks to a wide availability of dedicated chip sets. Within the topic of wireless charging – there are several different power levels, architectures, and design approaches associated with wireless power transfer. This paper will serve as a starting point and describe the families of capacitors

Optimizing Antenna Performance Through the Use of High Q, Tight Tolerance Capacitors

Optimizing Antenna Performance Through the Use of High Q, Tight Tolerance Capacitors

Optimizing Antenna Performance Through the Use of High Q, Tight Tolerance Capacitors Written By: Ron Demcko Abstract: Antenna matching is an important aspect of any RF system. Thinking in traditional terms, a properly designed and matched antenna increases the operating distance of the wireless product. Well matched antennas can transmit more power from the radio – therefore transmit over longer distances. Likewise, a well matched antenna allows the maximum transfer of energy from the receiving antenna to the receiver front end. Thus, allowing better receive characteristics for the system. But the use of a capacitor can also have a big impact upon the physical size of an antenna. If the goal is a compact, integrated antenna, the use of a

RF Passive Components Made Using Multi-Layer Organic Technology

RF Passive Components Made Using Multi-Layer Organic Technology

RF Passive Components Made Using Multi-Layer Organic Technology Written By: Ron Demcko Abstract: RF circuitry might be based upon the use of discrete components, low temperature co-fired ceramics (LTCC), hybrid component technology, a combination of all these or more design methods/techniques – depending upon the frequency spectrum, circuit type and power of the circuit. A new family of RF components based upon laminating multiple layers of organic materials is emerging. These Multi-Layer Organic devices (MLO) offer significant electrical, physical and reliability advantages over traditional discrete RF or LTCC solutions. This paper outlines the basics of MLO devices. A discussion of the families of product offering and discusses performance advantages of MLO technology is provided.

EMI Control

EMI Control

EMI Control Written By: Ron Demcko Abstract: EMI control is a key design goal in electronic systems. Three terminal FeedThru capacitor filters are one component option that can be used to simplify designs needing a broadband EMI filter response. The proper selection and use of SMT FeedThrus can lead to a variety of system improvements such as: reduced overall component count, less complex PCB layout, increasing manufacturability, improved reliability, and lower weight. It is because of these potential advantages that three terminal capacitors are now accepted in designs ranging from avionics to cell phones, automobiles to SMART grid controllers. This list of applications is growing as FeedThru capacitors evolve into smaller packages, obtain AEC Q200 qualification, and increase current ratings.

EMI Filtering for High-Reliability Applications

EMI Filtering for High-Reliability Applications

EMI Filtering for High-Reliability Applications Written By: Amanda Ison Abstract: Electromagnetic interference (EMI), or electrical noise, is generated by everything from cellphones to solar flares and can make accurate signal transmission as difficult as trying to have a clear conversation in a noisy room. To improve signal clarity in electronic circuits, device designers turn to EMI suppression filters. Effective EMI filtering is necessary for almost every modern electronic device, including devices that generate their own EMI, as well as devices that are sensitive to EMI within their environment, and is especially important in high-reliability applications that utilize lower-power signals and have strict signal fidelity demands. High-reliability EMI filters are designed to consistently meet or exceed performance requirements and are vitally

Bluetooth and Antenna Matching

Bluetooth and Antenna Matching

Bluetooth and Antenna Matching Written By: Ron Demcko Abstract: Antenna matching is an important aspect of any RF system. A properly designed and matched antenna increases the operating distance of the wireless product. Well matched antennas can transmit more power from the radio – therefore transmit over longer distances. Likewise, a well matched antenna allows the maximum transfer of energy from the receiving antenna to the receiver front end. Thus, allowing better receive characteristics for the system. Antenna matching becomes critical as antennas are reduced in size and placed in small modules that can experience wide temperature ranges and potentially have foreign objects in proximity. This paper discusses one class of intermediate Q capacitors used for SMT antenna matching

Using High-Directivity Couplers in Isolatorless Cellular Phone PA Control

Using High-Directivity Couplers in Isolatorless Cellular Phone PA Control

Using High-Directivity Couplers in Isolatorless Cellular Phone PA Control Written By: Avital Yaish Abstract: This article outlines the use of High-Directivity Couplers in Cellular handsets. Benefits can include increased talk-time, minimized insertion loss between the PA and the antenna and can also remove the need for an isolator. A version of this article was previously published in RF Design, April 2006.

Thin-Film Passives in RF/Microwave Circuits

Thin-Film Passives in RF/Microwave Circuits

Thin-Film Passives in RF/Microwave Circuits Written By: Ron Demcko Abstract: Until recently, most microwave capacitors were based on fired multilayer ceramic technology. In this process, layers of highly conductive electrode metal alloys are interleaved with low-loss ceramic dielectrics in a multilayer fashion until the target capacitance is obtained. The resulting stack is then sintered into a monolithic structure in a high-temperature firing process. This process continues to satisfactorily serve highpower capacitor needs in addition to those in larger value RF capacitors…

The Accu-L Multi-Layer Inductor for High Frequency Applications

The Accu-L Multi-Layer Inductor for High Frequency Applications

The Accu-L Multi-Layer Inductor for High Frequency Applications Written By: Barry N. Breen | Chaim Goldberger | Leonid Talalavsky Abstract: The telecommunications industry today is undergoing changes. The miniaturization of electronic circuits and the use of higher frequencies in radio communication systems such as Cellular Telephones, PCN and GPS places new demands on passive components. High frequency inductors have not kept pace with the demands. AVX has responded to these requirements by putting to market a miniature (0805) high frequency SMD inductor based on thin film technology. This article presents the basic concepts of high frequency inductors and how such low value inductors are measured and characterized. Here, too, there is a lag between the high frequency designer’s need for