University of Toronto - Chihou Lee UltraWideBand a.k.a. UWB Chihou Lee : ECE1352 : December 2003.

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Presentation transcript:

University of Toronto - Chihou Lee UltraWideBand a.k.a. UWB Chihou Lee : ECE1352 : December 2003

University of Toronto - Chihou Lee Introduction April 2002:  U.S. Federal Communications Commission (FCC) grants new spectrum for commercial use (3.1 GHz to 10.6 GHz) [Aiello,2003]

University of Toronto - Chihou Lee UWB Modulation Use IF signal to modulate RF carrier Vary delay between pulses to encode signal – PPM (pulse position modulation)

University of Toronto - Chihou Lee Transceiver Architecture [Aiello, 2003]

University of Toronto - Chihou Lee 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]

University of Toronto - Chihou Lee LNA Design Presenting [Sangyoub, 2003] UWB 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.

University of Toronto - Chihou Lee LNA Design (con’t) Three new components: L 1, L 2, C f L 1 : Gain  as freq  b/c Z[L 1 ] = wL 1 L 2 : Gain  as freq  b/c Z[L 2 ] = wL 2 C f : decouples output from input – allows for optimal biasing. Careful consideration given to choosing component values to avoid unstable system – see [Sangyoub, 2002]

University of Toronto - Chihou Lee Summary  UltraWideBand Technology: Use Monopulses to carry data Easy circuit implementation (lower cost, power)  Can’t transmit long distance b/c low transmit power

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