Simplifying BLDC commutation and feedback system
Design How-To 3/31/2009 Post a comment
In a Brushless DC (BLDC) motor system, an electronic mechanism
is required to commutate the system. Unlike a Brush DC motor system,
the permanent magnet is located at the Rotor and the windings are
located at the Stator. As a result of this setup arrangement, the
windings are required to energize in sequence, to enable smooth
commutation. For the electronic system to determine which windings to
energize, Hall sensor feedback is used to get the current location of
the windings with respect to the
IQE boosts sales, profits
News & Analysis 3/24/2009 Post a comment
Semiconductor wafer supplier IQE plc (Cardiff, Wales) says inventories are coming to an end after a slow Q1 and expects increasing demand in the second quarter of the year as it reported a seven-fold jump in full-year operating profits.
Photonic IC startup secures $19.5 million
News & Analysis 3/17/2009 Post a comment
OneChip Photonics Inc. (Ottawa, Canada), a developer of optical circuits in indium phospide, has secured $19.5 million in venture capital financing from Canadian and U.S. investors including BDC Venture Capital, DCM, GrowthWorks Canadian Fund and Morgenthaler Ventures.
Sierra mux/demux targets 100G network apps
News & Analysis 3/16/2009 Post a comment
Sierra Monolithics will start sampling in the second quarter of the year a range of 100G multiplexer with clock multiplier unit (CMU) and demultiplexer with clock and data recovery (CDR) devices, with volume production scheduled for the fourth quarter.
EU funded PON project touts cost reduction breakthrough
News & Analysis 3/12/2009 Post a comment
An interim review of the European Commission funded GigaWaM project, which is targeting the development and manufacture of application specific optical components for WDM-PON broadband access networks, indicates participants have demonstrated the manufacturing of AWG's with a 1.5 percent index.
Analyst: Top chip suppliers are underperforming
News & Analysis 3/11/2009 Post a comment
Almost all of the semiconductor industry's top 25 companies not only saw sales declines last year—they also underperformed the overall chip industry for the year, according to researchers at iSuppli (El Segndo, Calif.)
Light-emitting nanotube efficiency boosted
News & Analysis 3/9/2009 Post a comment
Light-emitting nanotubes have been demonstrated, but their efficiency was mysteriously lower than theory would predict. Now researchers claim to have discovered the mechanism limiting efficiency along with a remedy to the problem.
Software simulates OLED physics
Product News 3/6/2009 Post a comment
Startup Sim4tec (Dresden, Germany) is developing a software that helps researchers to better understand what happens inside the organic semiconductor and how designers can modify OLED properties.