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Department of Science and Technology Institutionen för teknik och naturvetenskap Linköping University Linköpings Universitet SE-601 74 Norrköping, Sweden 601 74 Norrköping Examensarbete LITH-ITN-ED-EX--02/23--SE Design of a Direct-conversion Radio Receiver Front-end in CMOS Technology Mats Erixon 2002-03-13

Design of a Direct-conversion Radio Receiver Front-end in ...18357/FULLTEXT01.pdf · mentioned inherited problems with direct conversion, one proposal for a solution is a differential

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Page 1: Design of a Direct-conversion Radio Receiver Front-end in ...18357/FULLTEXT01.pdf · mentioned inherited problems with direct conversion, one proposal for a solution is a differential

Department of Science and Technology Institutionen för teknik och naturvetenskap Linköping University Linköpings Universitet SE-601 74 Norrköping, Sweden 601 74 Norrköping

Examensarbete LITH-ITN-ED-EX--02/23--SE

Design of a Direct-conversion Radio Receiver Front-end in

CMOS Technology

Mats Erixon

2002-03-13

Page 2: Design of a Direct-conversion Radio Receiver Front-end in ...18357/FULLTEXT01.pdf · mentioned inherited problems with direct conversion, one proposal for a solution is a differential

LITH-ITN-ED-EX--02/23--SE

Design of a Direct-conversion Radio Receiver Front-end in

CMOS Technology

Examensarbete utfört i Elektroteknik vid Linköpings Tekniska Högskola, Campus Norrköping

Mats Erixon

Handledare: Joacim Olsson, Lars-olof Eriksson Examinator: Håkan Träff

Norrköping den 13 mars, 2002

Page 3: Design of a Direct-conversion Radio Receiver Front-end in ...18357/FULLTEXT01.pdf · mentioned inherited problems with direct conversion, one proposal for a solution is a differential

Rapporttyp Report category Licentiatavhandling x Examensarbete C-uppsats D-uppsats Övrig rapport _ ________________

Språk Language Svenska/Swedish x Engelska/English _ ________________

Titel Title Design of a Direct-conversion Radio Receiver Front-end in CMOS Technology Författare Author Mats Erixon

Sammanfattning Abstract In this Master's thesis, a direct-conversion receiver front-end has been designed in a 0.18um CMOS technology. Direct-conversion receivers (DCR) have obvious advantages over the heterodyne counterpart. Since the intermediate frequency (IF) is zero, the problem of image is circumvented. As a result, no front-end image reject filter is required and the channel selection requires only a low-pass filter, which makes it easy to integrate directly on chip. However, the DCR also suffers from several drawbacks such as extreme sensitivity to DC offsets, 1/f noise, local oscillator (LO) leakage/radiation, front-end nonlinearity and I/Q mismatch. This implies very high demands on the DCR front-end. The front-end comprises a low-noise amplifier (LNA) and a mixer. Different LNA and mixer architectures has been studied and from the mentioned inherited problems with direct conversion, one proposal for a solution is a differential source degenerated LNA and a differential harmonic mixer, which has been designed and simulated. The LNA has a gain of 12dB, a noise figure of 3.6dB and provides a return loss better than -15dB. The overall noise figure of the signal path is 8dB and the overall IIP3 and IIP2 is -12dBm and 31dBm, respectively.

ISBN _____________________________________________________ ISRN LITH-ITN-ED-EX—02/23--SE _________________________________________________________________ Serietitel och serienummer ISSN Title of series, numbering ___________________________________

Nyckelord Keyword Direct-conversion, Radio receiver, Front-end, CMOS, LNA, Mixer, Low-noise amplifier, Harmonic mixer.

Datum Date 2002-03-13

URL för elektronisk version

Avdelning, Institution Division, Department Institutionen för teknik och naturvetenskap Department of Science and Technology

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Page 38: Design of a Direct-conversion Radio Receiver Front-end in ...18357/FULLTEXT01.pdf · mentioned inherited problems with direct conversion, one proposal for a solution is a differential

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