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UltraWideBand a.k.a. UWB

UltraWideBand a.k.a. UWB. Chihou Lee : ECE1352 : December 2003. Introduction. April 2002: U.S. Federal Communications Commission (FCC) grants new spectrum for commercial use (3.1 GHz to 10.6 GHz). [Aiello,2003]. UWB Modulation. Use IF signal to modulate RF carrier.

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UltraWideBand a.k.a. UWB

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  1. UltraWideBanda.k.a. UWB Chihou Lee : ECE1352 : December 2003

  2. Introduction • April 2002: • U.S. Federal Communications Commission (FCC) grants new spectrum for commercial use (3.1 GHz to 10.6 GHz) [Aiello,2003]

  3. UWB Modulation Use IF signal to modulate RF carrier Vary delay between pulses to encode signal – PPM (pulse position modulation)

  4. Transceiver Architecture [Aiello, 2003]

  5. Implementation Challenges LNA & Mixer are the most challenging components to build. Designing LNA • narrowband LNA design no longer applies (can’t use inductive emitter degeneration) • Must match input/output over large frequency range • Very few UWB LNA implementations (1) [Sangyoub, 2002] Designing Mixer • Mixer uses similar matching concepts as LNA to achieve wideband matching [Sangyoub, 2002]

  6. LNA Design Series-Shunt feedback Amplifier PROs: good NF, and wideband (use shunt-series to match input & output) CONs: non-optimal biasing means low gain, potential stability issues. Presenting [Sangyoub, 2003] UWB LNA design:

  7. LNA Design (con’t) • Three new components: L1, L2, Cf • L1: Gain as freq b/c Z[L1] = wL1 • L2: Gain as freq b/c Z[L2] = wL2 • Cf: decouples output from input – allows for optimal biasing. Careful consideration given to choosing component values to avoid unstable system – see [Sangyoub, 2002]

  8. Summary • UltraWideBand Technology: • Use Monopulses to carry data • Easy circuit implementation (lower cost, power) • Can’t transmit long distance b/c low transmit power

  9. References [Aiello, 2003]G.Roberto Aiello, "Challenges for Ultra-wideband (UWB) CMOS Integration". RFIC 2003. [Cravotta, 2002]Nicholas Cravotta, "Ultrawidband: the next wireless panacea?". www.edn.com, Oct, 2002. [Sangyoub, 2002]Sangyoub Lee, "Design and Analysis of Ultra-Wide Bandwidth Impulse Radio Receiver", University of Southern California PhD Dissertation, 2002. [Leeper, 2003]David G. Leeper “Ultrawideband – the next step in short range wireless”, RFIC 2003 [Molisch, 2003]Andreas F. Molisch, Jinyun Zhang, “Time hopping and frequency hopping in ultrawideband systems”, IEEE 2003. [Mitchell, 2001]Terry Mitchell, “Broad is the way”, IEE Review Jan 2001. [Namgoong, 2003]Won Namgoong, “A Channelized Digital Ultrawideband Receiver”, IEEE Transactions on Wireless communications, 2003. [Siwiak, 2001]Kazimierz Siwiak, “UWB: Introducing a New Technology”, VTC 2001. [Barras]David Barras, “A Comparison between UWB and Narrowband Transceivers”. [Lerdworatawee, 2003]Jongrit Lerdworatawee, Won Namgoong, “Low Noise Amplifier Design for UWB,” IEEE 2003.

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