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Rajan Bedi

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Head of Mixed-Signal Design Group at EADS Astrium

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Rajan Bedi

's contributions
  • 09.03.2014
  • 5 Comment(s)
Pesky parasitics
  • 12.17.2013
  • 6 Comment(s)
Twinkle twinkle little stars!
  • 11.08.2013
  • 1 Comment(s)
Behaving passively!
  • 09.03.2014
  • Pesky parasitics
  • Dave, many thanks for your comment. There are many reasons for the in-band spurious, please email me directly so I can review your design. Rajan.
  • 09.03.2014
  • Pesky parasitics
  • Hi Steve, many thanks for your technical comments. The key point that I want to share with readers is that hardware-design decisions impact commercial and operational concerns. A system-wide appreciation is required to enable the next generation of higher-performing solutions for customers, developed right-first-time and delivered to cost and schedule. As we both share a passion for power electronics, I am prepared to write an independent review of your new book for readers of the Out-of-this-World Design community. I could post next January or February, if this is of interest, please get in touch. Rajan.
  • 08.01.2014
  • A comparison of space-grade FPGAs - Part 3
  • Hi NASA Guy, many thanks for your comment: I agree that beam tests are still needed, however, fault injection is a complementary method if used correctly can limit the amount of time required at a cyclotron. During irradiation, the device under test is rarely tested using identical operational stimuli. As someone who has spent time at these facilities, I am in favour of using all methods to assess the potential sensitivity of a part - fault injection is one such technique that adds value to this process. I note and understand your other comments about space-grade, SRAM-based FPGAs as well as marketing hype. Thanks once again, Rajan.
  • 07.08.2014
  • A comparison of space-grade FPGAs - Part 2
  • Dave, many thanks for your feedback: analog and mixed-signal circuits are indeed sensitive to SETs and in-orbit effects from linear devices were first observed in the 1990s. SETs have unique shapes, polarities, amplitudes and durations that are dependant on impact location, ion LET, biasing, power supply and loading of devices such as op-amps, comparators, references, regulators ADCs and DACs. Rajan.
  • 05.02.2014
  • Switch-mode regulators for space applications
  • Jim, thank you for your kind feedback on this article and many congratulations to you and your colleagues for being part of the team and contributing to our missions. I hope we have the privilege of working together with you on future programs. Rajan.
  • 05.02.2014
  • Switch-mode regulators for space applications
  • Dave, commercial foundries have previously used LOCOS to isolate current leakage between adjacent transistors. However, the larger nodes used by space, power microelectronics can be sensitive to total-dose radiation and some foundries have combined LOCOS between the devices within the well, with trench isolation between wells, to protect against total-dose effects. STI is lateral with the silicon surface and not affected by thinning. Rajan.