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Search: db:Swepub > (2010-2011) > Conference paper

  • Result 1-10 of 28931
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  • Aamir, Syed Ahmed, 1980-, et al. (author)
  • A 1.2-V pseudo-differential OTA with common-mode feedforward in 65-nm CMOS
  • 2010
  • In: Proceedings of the 17th IEEE International Conference on Electronics, Circuits, and Systems. - : Institute of Electrical and Electronics Engineers (IEEE). ; , s. 29-32
  • Conference paper (peer-reviewed)abstract
    • In this work, we describe the implementation of a 1. 2-V pseudo-differential operational transconductance amplifier (OTA) with common-mode feedforward (CMFF) and inher­ent common-mode feedback (CMFB) in a 65-nm, digital CMOS process. The OTA architecture provides an inher­ent CMFB when cascaded OTA structures are utilized andthis work has studied a cascaded amplifier consisting of fourstages. Due to the low-gain using core 65-nm circuit de­vices, the overall gain must be distributed on all four stages to acquire a gain of more than 60 dB, while maintaining a-3-dB bandwidth of 200 MHz. To achieve high gain, we propose using a modified, positive-feedback, cross-coupled input differential stage. The modified OTA achieves a high output swing of ± 0.85 V due to only two stacked transistors, 88 dB DC gain and a third-order harmonic of -60 dB for 800 mVpp at 30 MHz. Further on, in a capacitive buffer configuration, we achieve a high slew rate of 1240 V/µS, -3-dB bandwidth of 509 MHz, signal-to-noise ratio of 63 dB while consuming 10.4 mW power.
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9.
  • Aamir, Syed Ahmed, 1980-, et al. (author)
  • A 500-MHz low-voltage programmable gain amplifier for HD video in 65-nm CMOS
  • 2010
  • In: Proceedings of 28th IEEE Norchip Conference., NORCHIP'10. - Tampere : www.ieee.org. - 9781424489718 - 9781424489725 ; , s. 1-4
  • Conference paper (peer-reviewed)abstract
    • This work describes the implementation of a 1.2-V programmable gain amplifier (PGA) for high-definition (HD) video digitizers in a 65-nm digital CMOS process. The “pseudo” switched-capacitor (SC) PGA architecture buffers the video signal, without switching, during the active video. The SC circuitry is used for setup of DC operating point during horizontal and vertical blanking periods. Additionally, it compensates for the `sync-tip' of analog video signals to an equal blanking level for increased dynamic range to the digitizer following the PGA. The operational transconductance amplifier (OTA) employed as main amplifier in the PGA is a pseudo-differential, positive-feedback input stage architecture with a common-mode feedforward (CMFF) technique. The common-mode feedback (CMFB) is provided once two OTAs are cascaded. Schematic-level simulation results show that the OTA maintains a -3-dB bandwidth of 550 MHz, while keeping the distortion HD3 at -60 dB for a 30-MHz, 850 mVpp high definition video signal. The 88 dB DC gain is distributed among four OTA stages and the overall, combined PGA achieves a signal-to-noise ratio of 63 dB. Due to only two stacked transistors, it achieves high output swing of ±0.85 V, 1240 V/μs slew rate while consuming 10.4 mW power.
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10.
  • Aamodt, A., et al. (author)
  • Case-based reasoning for assessment and diagnosis of depression in palliative care
  • 2010
  • In: Proceedings - IEEE Symposium on Computer-Based Medical Systems. ; , s. 480-485
  • Conference paper (peer-reviewed)abstract
    • The goal of the research presented is to create a computational framework and system architecture for clinical decision support in palliative care. The application focused is the classification of depression. The method under investigation is case-based reasoning, motivated by the complexity of the domain and a lack of generalized principles of sufficient coverage and strength for diagnosis and treatment. A system architecture is described and exemplified through an implemented prototype. The outcome of the research so far is a system that captures the properties intended, and for which a clinical test set-up has been defined. © 2010 IEEE.
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