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Wideband LNA for aMultistandard RF-Sampling Front-End in 0.13 μm CMOS
Linköping University, Department of Electrical Engineering. Linköping University, The Institute of Technology.
Linköping University, Department of Electrical Engineering, Electronic Devices. Linköping University, The Institute of Technology.
Linköping University, Department of Electrical Engineering, Electronic Devices. Linköping University, The Institute of Technology.
Linköping University, Department of Electrical Engineering, Electronic Devices. Linköping University, The Institute of Technology.
(English)Manuscript (Other academic)
Abstract [en]

The pad pitch of modern RF ICs is in order of few tens of micrometers. Connecting the large number of high speed I/Os to outside world with good signal fidelity and low cost is extremely challenging. To cope with this requirement, we need reflection-free transmission lines from on-chip pad to on-board SMA connectors. Such a transmission line is very hard to design due to the difference in on-chip and on-board feature size and the requirement for extremely large bandwidth. In this paper, we propose the use of narrow tracks close to chip and wide tracks away from the chip. This narrow to wide transition in width results in impedance discontinuity. A step change in substrate thickness is utilized to cancel the effect of the width discontinuity, thus achieving a reflection-free microstrip. To verify the concept several microstrips were designed on multilayer FR4 PCB without any additional manufacturing steps. The TDR measurements reveal that impedance variation is less then 3Ω for 50Ω microstrip when the width changes from 165μm to 940μm and substrate thickness changes from 100μm to 500μm. The Sparameter measurement on same microstrip shows S11 better then -9dB for the frequency range 1-6GHz

National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-14088OAI: oai:DiVA.org:liu-14088DiVA: diva2:22600
Available from: 2006-10-16 Created: 2006-10-16 Last updated: 2010-01-14
In thesis
1. Multiband LNA Design and RF-Sampling Front-Ends for Flexible Wireless Receivers
Open this publication in new window or tab >>Multiband LNA Design and RF-Sampling Front-Ends for Flexible Wireless Receivers
2006 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The wireless market is developing very fast today with a steadily increasing number of users all around the world. An increasing number of users and the constant need for higher and higher data rates have led to an increasing number of emerging wireless communication standards. As a result there is a huge demand for flexible and low-cost radio architectures for portable applications. Moving towards multistandard radio, a high level of integration becomes a necessity and can only be accomplished by new improved radio architectures and full utilization of technology scaling. Modern nanometer CMOS technologies have the required performance for making high-performance RF circuits together with advanced digital signal processing. This is necessary for the development of low-cost highly integrated multistandard radios. The ultimate solution for the future is a software-defined radio, where a single hardware is used that can be reconfigured by software to handle any standard. Direct analog-to-digital conversion could be used for that purpose, but is not yet feasible due to the extremely tough requirements that put on the analog-to-digital converter (ADC). Meanwhile, the goal is to create radios that are as flexible as possible with today’s technology. The key to success is to have an RF front-end architecture that is flexible enough without putting too tough requirements on the ADC.

One of the key components in such a radio front-end is a multiband multistandard low-noise amplifier (LNA). The LNA must be capable of handling several carrier frequencies within a large bandwidth. Therefore it is not possible to optimize the circuit performance for just one frequency band as can be done for a single application LNA. Two different circuit topologies that are suitable for multiband multistandard LNAs have been investigated, implemented, and measured. Those two LNA topologies are: (i) wideband LNAs that cover all the frequency bands of interest (ii) tunable narrowband LNAs that are tunable over a wide range of frequency bands.

Before analog-to-digital conversion the RF signal has to be downconverted to a frequency manageable by the analog-to-digital converter. Recently the concept of direct sampling of the RF signal and discrete-time signal processing before analog-to-digital conversion has drawn a lot of attention. Today’s CMOS technologies demonstrate very high speeds, making the RF-sampling technique appealing in a context of multistandard operation at GHz frequencies. In this thesis the concept of RF sampling and decimation is used to implement a flexible RF front-end, where the RF signal is sampled and downconverted to baseband frequency. A discrete-time switched-capacitor filter is used for filtering and decimation in order to decrease the sample rate from a value close to the carrier frequency to a value suitable for analog-to-digital conversion. To demonstrate the feasibility of this approach an RF-sampling front-end primarily intended for WLAN has been implemented in a 0.13 μm CMOS process.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2006. 234 p.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1036
Keyword
RF, Microelectronics, Multiband LNAs, RF-Sampling, Sampling Front-Ends, Flexible Wireless Receivers, Multistandard Receivers.
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:liu:diva-7582 (URN)91-85523-22-4 (ISBN)
Public defence
2006-10-27, Visionen, Hus B, Campus Valla, Linköpings universitet, Linköping, 10:15 (English)
Opponent
Supervisors
Available from: 2006-10-16 Created: 2006-10-16 Last updated: 2012-01-30Bibliographically approved

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Ramzan, RashadAndersson, StefanDabrowski, JerzySvensson, Christer

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