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.
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SMT Process Characteristics of AVX TransGuards Written By: Ron Demcko Abstract: TransGuards are uniquely suited for wide-scale usage in SMT applications. TransGuards exhibit many advantages when used in SMT assemblies. This paper is a general guideline aimed at familiarizing users with the characteristics of soldering multilayer SMT ZnO TransGuards.
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
LCD Driver Circuit EMI Filtering Options Written By: Ron Demcko Abstract: A review of EMI filter component options, comparing product performance, device characteristics and related factors (eg PCB board area, placement cost, etc.).
Charge Control Methods for SuperCapacitors: Methods to Protect Power Sources from Damage Due to High Current Demands of SuperCapacitors Written By: Ron Demcko | Joe Hock | Ashley Stanziola | Daniel West Abstract: Circuit designs exploiting the increased energy storage provided by supercapacitors, requires careful consideration of the increased power handling, than that of batteries, when charging these devices. The unique composition of electrochemical double-layer capacitors (EDLC) inherently allows them to withstand large currents. Table 1 below is a brief list of AVX cylindrical (SCC) and series-connected module (SCM) SuperCapacitors, displaying peak current supply and sink current capability. These maximum specifications will typically exceed current capability of charge sources, and lead to failures within the power supply system. Supercapacitors have
Equivalent Circuit Model for Tantalum and Niobium Oxide Capacitors for use in Simulation Software Written By: J. Pelcak Abstract: In electrical circuit simulations with simulation software, ideal passive components (resistors, capacitors, inductors) are typically used because real component characteristics have been difficult to model. Unfortunately, ideal and real passive components have significant differences in their electrical behavior. These differences lead to discrepancies between actual hardware performance and expected results based upon simulation software programs. This paper will describe the development of equivalent circuit diagram for modeling real capacitor behavior. Use of this real model in simulation software can help make circuit development more efficient, as the circuits in the simulations should have similar behavior to the actual circuits. The model
How to Choose the Correct Accu-Guard Fuse for Circuit Protection Written By: Irina Daynov | Barry Breen Abstract: The ACCU-GUARD is designed to meet the need of electronic circuits for a small, accurate surface mount fuse. This article presents design guidelines for achieving optimal protection of circuits with ACCU-GUARD. All major parameters are described including operating temperature, circuit voltage, fault current, steady state current and current pulses (Joule integral).
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
Capacitor Selection and EMI Filtering Written By: Jeffrey Cain | Steve Makl Abstract: MLCCs are an inexpensive, yet effective, method for reducing the noise on both power/ground systems and signal lines themselves. Choosing the proper capacitance value such that the impedance is minimized at the frequency of interest also makes a difference.
Conductivity Mechanisms and Breakdown Characteristics of Niobium Oxide Capacitors Written By: J. Sikula | J. Hlavka | V. Sedlakova | L. Grmela | P. Hoeschl | T. Zednicek | Z. Sita Abstract: Niobium Oxide capacitor, has already found its place in the market as a cost effective and reliable non-burning component. The study of conductivity mechanisms has been done to prove its excellent stability, reliability and non-burning performance. Set of electrical measurements as VA characteristics in forward and reverse mode, frequency characteristics of capacitance, temperature or time dependence of basic parameters together with measurements of basic physical parameters enabled to propose the theoretical model of NbO – Nb2O5 – MnO2 system. NbO Capacitor shows identical conductivity mechanism as tantalum capacitor,