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Multi-Band Receiver Design for LTE Mobile Communication

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Measured baseband filter transfer functions, demonstrating the flat transfer function and the wide range of programmability in terms of frequency and gain.




René Blattman


ETH Zurich




Wireless internet access and social media are becoming more and more important in our daily life. A mobile phone is not primarily a wireless phone anymore. It is rather a lifestyle device connecting the user to the whole world. New generations of smart phones and tablet computers make this online experience everywhere possible.

As a consequence, mobile communication is shifting from voice- to data-oriented systems. To meet the increasing requirements, the 3rd Generation Partnership Project (3GGP) has developed the 3G Long Term Evolution (LTE) as a new standard. LTE is a flat, IP-based network architecture. The introduction of new features like modulation schemes up to 64 QAM and MIMO operation increase the achievable data rate.

The received signal of a mobile communication device is converted to baseband. Before analog-to-digital conversion, the signal needs to be filtered and amplified by the baseband filter. The most important task of the baseband filter is to suppress the unwanted blocker signals. For proper signal reception the filter has to be highly linear and provide low noise. The designed circuit has been fabricated in a 130-nm CMOS technology. Measurements show a very flat in-band ripple in all modes with a 50x cutoff frequency programmability range from GSM to the highest LTE mode. Currently, the filter is redesigned to support LTE advanced functionality and increase the power efficiency.