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EDNE MARCH 2013

16 Signal integrity issues on the rise EDN collates the opinions of a “virtual panel” who offer eye-opening advice for anticipating, detecting, and mitigating SI problems in faster, increasingly complex designs. Moderated by Janine Love, Editor in Chief, Test & Measurement World 23 Why your 4.7-μF ceramic cap becomes a 0.33-μF cap An investigation into temperature and voltage variations in X7R capacitors underscores the importance of data sheets. By Mark Fortunato, Maxim Integrated 26 Anatomy of a highly-resonant wireless power transfer system Efficient Power Conversion (EPC) made available a demonstration board, or more correctly a suite of boards, that act as a demonstrator and development tool for a wireless power transfer scheme. 28 Detecting and distinguishing cardiacpacing artifacts Buried in noise and larger cardiac signals, the artifacts of a pacemaker are difficult to spot. A combination of signal processing and methodology can help interpretation. By John Kruse and Catherine Redmond, Analog Devices 34 Common inter-IC digital interfaces for audio data transfer Understanding the pros and cons of different interfaces before selecting parts helps ensure that you have the most efficient implementation of the signal chain. By Jerad Lewis, Analog Devices contents March 2013 departments & Columns 7 EDN.comment Battery management matters 14 Baker’s Best What does “rail to rail” output operation really mean? 41 Mechatronics Tribology – an essential but neglected science 44 T ales from the Cube Nonlinear transmission lines keep developer on the fence 42 Product Roundup DesignIdeas 37 An improved offline driver lights an LED string 39 Low-duty-cycle LED flasher keeps power draw at 4 mW 40 Rotary encoder with absolute readout offers high resolution and low cost pulse 4 G raphics controller cuts cost of embedded displays 8 Microchip turns tag into touch 10 Tanner offers open-access for EDA tool suite 10 Open source RF hardware for wireless innovation 11 Multi-cell balancing to increase battery pack performance 12 Smallest ARM-based MCU, claims Freescale 13 Intel steps up support for industrial control designs 13 Design RS485 links with assured EMC protection 2 EDN Europe | MARCH 2013 www.edn-europe.com


EDNE MARCH 2013
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