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 [email protected] http://www.umn.edu/~harjani
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Minnesota Analog Design Group, University of Minnesota ([email protected]) 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 ([email protected]) 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 ([email protected]) 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 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 ([email protected]) 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 ([email protected]) 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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