Series in Microelectronics
Design of a Highly Linear Direct-Conversion Receiver
for Third-Generation Mobile Communications
2006; XIV, 180 pages. € 64,00. ISBN 3-86628-093-9
The focus of this dissertation is on the design of a direct-conversion receiver für third-generation mobile communications. After providing the necessary background in terms of system level design, an in-depth theoretical analysis of the operation of the active switching mixer is presented. The leakage of the strang transmitter signal in the FDD mode of UMTS poses very stringent linearity requirements on the receiver, and particularly on the ilP2 of the 1/0 demodulator. An external receiver filter is used in the implemented zero-IF receiver prototype to surmount the insufficient ilP2 of the 1/0 demodulator achieved für typical tolerances and speed in CMOS. To improve the ilP2 of the demodulator necessary to remove the external RX filter, an innovative ilP2 enhance- ment technique is presented. The description of the implemented in a 0.13 μm CMOS process 1/0 demodulator with improved ilP2 along with its experimental characterization concludes this work.
Ilian Kouchev received his M.Sc. degree in Electrical Engineering from the Technical University of Varna, Bulgaria in 1998. In 2000 he obtained a Post Graduate Degree in Communication Systems from the Swiss Federallnstitute of Technology (ETH), Lausanne. In the same year, he joined the Integrated Systems Laboratory (IIS) of ETH Zürich as a research and teaching assistant, where he worked in the fjeld of receiver design für radio communications.
Keywords: UMTS, Homodyn, Mischer, Linearität, CMOS, Demodulator, WCDMA, Offset, Opamp.
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