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  • M521: Positive Voltage Control of GaAs MMIC Control Devices
    GaAs control devices have seen a tremendous growth in recent years with M/A-COM being the market leader in this area. The fact that these devices are negative voltage controlled devices has precluded the use of standard low cost CMOS drivers and has forced users to develop hybrid driver circuits
  • MICRO: Process Equipment Control- Luckman (February 2001)
    regions for NPN (negative-positive-negative) bipolar transistors. Although indium provides some important performance advantages, there are concerns that must be addressed before a fab switches to its use. Indium implantation requires the use of highly hygroscopic indium trichloride (InCl
  • A Push Towards Efficiency
    Series A pinch valves offer positive control of fluids in sterile pharmaceutical and biotechnical applications. Red silicone and EPDM pinch tube elements comply with 21CFR Part 177.2600. The valves offer straight-through flow for enhanced draining and cleaning. A spring-loaded stem controls
  • Evaluating the use of MEMS-based gas and fluid delivery systems
    and electromechanical counterparts. With recent MEMS innovations, the list of conventional gas and liquid control components that can be replaced with smaller, MEMS-based equivalents includes mass-flow controllers (MFCs), pressure regulators, and positive shutoff valves. It is now possible to replace
  • What to Expect at Interphex 2007
    of Emerson Process Management, Brooks Instrument provides integrated low-flow fluid measurement and control instrumentation. The Brooks product line features a number of technologies to handle a wide range of flow challenges including Coriolis, thermal mass, variable area (rotometers) and positive
  • MICRO: Controlling particles in sputter deposition modules
    dc bias to a target (or cathode) made from the desired deposition material. The positive ions generated in the plasma are accelerated toward the target and, through momentum transfer, the atoms at the target surface are sputtered into the chamber as a
  • Vibration Isolators Protect Electronics at Low Frequencies
    Negative Stiffness a Big Positive for Vibration Isolation All-mechanical systems shield delicate electronics from low-frequency vibrations and require less space, investment, and maintenance. * Negative-stiffness isolators use mechanical components to keep vibrations from sensitive equipment
  • Metrigraphics Article in Today's Medical Developments
    . Standard electroplating runs a DC current through an electrolyte, you flip a switch, and you plate. Electroforming is not quite that simple. "We change current densities, we pulse it, we sometimes will go positive/negative to create various surfaces. So it's the process and the choice of material

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