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PCBD-Nov2015

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62 The PCB Design Magazine • November 2015 • The trend now is to put control of the auto- router back into the hands of the designers to enable clean, highly desirable results. • The Sketch router can optimize the trace fanouts at both ends of the netlines, avoid- ing additional vias when completing the routes. PCBDESIGN References 1. Barry Olney Beyond Design columns: Critical Placement, Interactive Placement and Routing Strategies, Routing Techniques for Complex Designs 2. Charles Pfeil: BGA Breakouts & Routing 3. Michael Pecht: Placement and Routing of Electronic Modules 4. The ICD Stackup and PDN Planner: www. icd.com.au 5. Sketch router information: www.pads. com/professional beyond design Barry Olney is managing director of in-Circuit Design Pty ltd (iCD), Australia. This PCB design service bureau specializes in board-level simulation, and has developed the iCD Stackup Planner and iCD PDN Planner software. To read past columns, or to contact olney, click here. WHY AuTOROuTERS DON'T WORk: THE MINDSET! Ever wonder about the future of space sci- ence? hop inside a time machine that transports you back 40 years and you may get a good idea about where things are headed. history, it would seem, has a funny way of repeating itself. Serviceable spacecraft—like the NASA-devel- oped Multi-Mission Modular Spacecraft (MMS) and, of course, the iconic hubble Space Tele- scope that NASA conceived and developed in the 1970s with servicing in mind—are once again de rigueur. Case in point: As required by Congress in a law passed in 2010 and then amended five years later, NASA is requiring that proposed flagship astrophysics missions support servicing, even if their orbits are up to a million miles away. The agency also released a request for information (rFi) seeking ideas for a spacecraft design that it could use for both its proposed Asteroid redirect Mission (ArM) and as a vehicle for refueling a government satellite in low-Earth orbit. "The 40-year cycle is starting all over again," said Benjamin reed, deputy project manager of the Satellite Servicing Capabilities office (SSCo) at NASA's Goddard Space Flight Center in Green- belt, Maryland. WFirST-AFTA, which NASA plans to equip with an 8-foot (2.4-meter) mirror and a slitless spectrometer and imager, will study dark ener- gy, the mysterious form of energy that perme- ates all of space and accelerates the expansion of the universe, while providing cosmic surveys. it also will carry a coronagraph that will allow the observatory to image giant exoplanets and debris disks in other solar systems. other conceptual missions that various groups currently are studying in preparation for the 2020 Astrophysics Decadal Survey also could operate in more distant orbits. one possible scientific objective would be to find Earth-size exoplanets in the habitable zone in our solar neighborhood and then identify chemicals in their atmospheres that may indicate the presence of life. To achieve these ambitious goals, WFirST and the other conceptual observatories ideally would operate from Sun-Earth l2 (SEl2), a thermally sta- ble sun-Earth orbit roughly a million miles away. Back to the Future: Serviceable Spacecraft Make a Comeback

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