intro8337_2008a

intro8337_2008a - Analog/RF Circuits for Wired/Wireless...

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Analog/RF Circuits for Wired/Wireless Communications EE 8337 Spring 2008 Ramesh Harjani Department of Electrical & Computer Engineering University of Minnesota harjani@ece.umn.edu http://www.umn.edu/~harjani
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Minnesota Analog Design Group, University of Minnesota (harjani@ece.umn.edu) 2 Outline ± Wireless communication systems z Its everywhere you want to be z Why CMOS? ± What makes RF interesting (difficult) z Low noise z High linearity ± Transceiver architectures ± Complex filters ± Conclusions
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Minnesota Analog Design Group, University of Minnesota (harjani@ece.umn.edu) 3 Ubiquitous Wireless Examples ± Dick Tracy is here - popular science Oct 2000 ± A flick of a wrist and you are connected Motorola GSM (late 2001) LG CES Show (Jan 2008)
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Minnesota Analog Design Group, University of Minnesota (harjani@ece.umn.edu) 4 Ubiquitous Wireless Examples ± Provides you time and place ± Casio wristwatch with built-in global positioning system (GPS) ± Position accuracy 10 meter RMS ± Approximate Operation on Full- Charge ² Automatic Measurement: 3 hours, 30 minutes (1-minute interval, 30 seconds per measurement ) Source: www.eluxury.com ± GPS watches for runners ± Polar Running Mens Watch ± $400 ± Power levels have come down significantly ± SiRF CMOS RF GPS receiver www.amazon.com
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Minnesota Analog Design Group, University of Minnesota (harjani@ece.umn.edu) 5 Examples (cont.) ± Radio controlled watch ± Automatically, adjusts itself by synchronizing itself to the U.S. Atomic Clock in Fort Collins Colorado ± Accurate to 1 second in 1.8 million years ± Adjusts itself for daylight saving time ± Frequency: ~60kHz ± Wavelength: 5km ± Antenna: lambda/4 = 1.25km ± http://www.boulder.nist.gov/timefreq/sta tions/wwvb.htm ± http://www.time.gov ± Source: http://www.righttime.com
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Minnesota Analog Design Group, University of Minnesota (harjani@ece.umn.edu) 6 Wireless is Ubiquitous ± China produced 230 million units in 2004 - Xinhua A vegetable vendor uses his mobile phone as he waits for customers at an outdoor market in Beijing in this June 2004 file photo. REUTERS/Guang Niu
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Minnesota Analog Design Group, University of Minnesota (harjani@ece.umn.edu) 7 Wireless is Ubiquitos ± Mobile phone market seen to reach 2 bln users in '05 z Deloitte & Touche, Jan 18 2005 Sri Lankan labourer Simon Perera answers his mobile phone in Colombo's wholesale market March 31, 2003 file photo. REUTERS/Anurudhha Lokuhapuarachchi
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Minnesota Analog Design Group, University of Minnesota (harjani@ece.umn.edu) 8 Wireless Market ± Photo: India's mobile additions may hit 6-8 mln per month z Reuters, Tuesday February 14, 06:51 PM
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Minnesota Analog Design Group, University of Minnesota (harjani@ece.umn.edu) 10 Bluetooth ± Bluetooth is an example of wireless PAN z 802.15.1 Æ 802.15.3 (High Rate) ± Primary usage model: a replacement for wires ± Example applications z Keyboard and computer wireless connection z PDA (Palm etc) and computer (sync) z Cell phone and ear piece ± Design focus z Low power z Limited range (~10 meters) z Low cost ($5 total original goal) z Low speed (< 732kbps) z No roaming Sources: .
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intro8337_2008a - Analog/RF Circuits for Wired/Wireless...

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