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A Self-Tuning Technique for Optimization of Dual Band LNA
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.
2008 (English)In: European Wireless Technology Conference (EuWiT), EuMW 2008, October 27-28, 2008, Amsterdam, The Netherlands, IEEE , 2008, 178-181 p.Conference paper, Published paper (Refereed)
Abstract [en]

This paper presents a self-tuning technique for optimization of a dual band LNAthat can be used in a flexible RF front-end suitable for IEEE 802.11a/b/g WLANapplications. With this tuning technique the LNA can perform self-calibrationfor the optimal performance. A possible shift in resonance frequency due toprocess and temperature variations can be compensated by this method. Theproposed self-tuning technique is implemented by using a simple RF detector atthe LNA output. Based on the DC value provided by this detector the LNA istuned for a maximum gain through the tuning loop, which incorporates ADC,digital base-band and DAC. We show that the tuning error can be within halfLSB of ADC provided the DAC and ADC resolutions are constraint by aspecified condition. For 4-bit case this value corresponds to a gain error of0.4 dB. The LNA has been implemented in 0.2μm GaAs process offered byOMMICTM. In measurements the LNA achieves a gain of 15.1 dB and 21.6 dBin the upper and lower band, respectively, with corresponding NF of 3.8 dB and2.8 dB. In the lower band the measured IIP3 is -3 dBm and 1dB_CP is -8 dBm.

Place, publisher, year, edition, pages
IEEE , 2008. 178-181 p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-14862ISBN: 978-2-87487-008-8 (print)OAI: oai:DiVA.org:liu-14862DiVA: diva2:25372
Available from: 2008-09-26 Created: 2008-09-26 Last updated: 2009-05-29Bibliographically approved
In thesis
1. Reconfigurable and Broadband Circuits for Flexible RF Front Ends
Open this publication in new window or tab >>Reconfigurable and Broadband Circuits for Flexible RF Front Ends
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Most of today’s microwave circuits are designed for specific function and special need. There is a growing trend to have flexible and reconfigurable circuits. Circuits that can be digitally programmed to achieve various functions based on specific needs. Realization of high frequency circuit blocks that can be dynamically reconfigured to achieve the desired performance seems to be challenging. However, with recent advances in many areas of technology these demands can now be met.

Two concepts have been investigated in this thesis. The initial part presents the feasibility of a flexible and programmable circuit (PROMFA) that can be utilized for multifunctional systems operating at microwave frequencies. Design details and PROMFA implementation is presented. This concept is based on an array of generic cells, which consists of a matrix of analog building blocks that can be dynamically reconfigured. Either each matrix element can be programmed independently or several elements can be programmed collectively to achieve a specific function. The PROMFA circuit can therefore realize more complex functions, such as filters or oscillators. Realization of a flexible RF circuit based on generic cells is a new concept. In order to validate the idea, two test chips have been fabricated. The first chip implementation was carried out in a 0.2μm GaAs process, ED02AH from OMMICTM. The second chip was implemented in a standard 90nm CMOS process. Simulated and measured results are presented along with some key applications such as low noise amplifier, tunable band pass filter and a tunable oscillator.

The later part of the thesis covers the design and implementation of broadband RF front-ends that can be utilized for multistandard terminals such as software defined radio (SDR). The concept of low gain, highly linear frontends has been presented. For proof of concept two test chips have been implemented in 90nm CMOS technology process. Simulated and measurement results are presented. These RF front-end implementations utilize wideband designs with active and passive mixer configurations.

We have also investigated narrowband tunable LNAs. A dual band tunable LNA MMIC has been fabricated in 0.2μm GaAs process. A self tuning technique has been proposed for the optimization of this LNA.

Place, publisher, year, edition, pages
Link: Linköping University Electronic Press, 2009. 82 p.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1259
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-18512 (URN)978-91-7393-605-7 (ISBN)
Public defence
2009-08-25, Visionen, Hus B, Campus Valla, Linköpings universitet, Linköping, 13:15 (English)
Opponent
Supervisors
Available from: 2009-05-29 Created: 2009-05-29 Last updated: 2009-05-29Bibliographically approved
2. Programmable and Tunable Circuits for Flexible RF Front Ends
Open this publication in new window or tab >>Programmable and Tunable Circuits for Flexible RF Front Ends
2008 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Most of today’s microwave circuits are designed for specific function and specialneed. There is a growing trend to have flexible and reconfigurable circuits. Circuitsthat can be digitally programmed to achieve various functions based on specific needs. Realization of high frequency circuit blocks that can be dynamically reconfigured toachieve the desired performance seems to be challenging. However, with recentadvances in many areas of technology these demands can now be met.

Two concepts have been investigated in this thesis. The initial part presents thefeasibility of a flexible and programmable circuit (PROMFA) that can be utilized formultifunctional systems operating at microwave frequencies. Design details andPROMFA implementation is presented. This concept is based on an array of genericcells, which consists of a matrix of analog building blocks that can be dynamicallyreconfigured. Either each matrix element can be programmed independently or severalelements can be programmed collectively to achieve a specific function. The PROMFA circuit can therefore realize more complex functions, such as filters oroscillators. Realization of a flexible RF circuit based on generic cells is a new concept.In order to validate the idea, a test chip has been fabricated in a 0.2μm GaAs process, ED02AH from OMMICTM. Simulated and measured results are presented along withsome key applications like implementation of a widely tunable band pass filter and anactive corporate feed network.

The later part of the thesis covers the design and implementation of tunable andwideband highly linear LNAs that can be very useful for multistandard terminals suchas software defined radio (SDR). One of the key components in the design of a flexibleradio is low noise amplifier (LNA). Considering a multimode and multiband radiofront end, the LNA must provide adequate performance within a large frequency band.Optimization of LNA performance for a single frequency band is not suitable for thisapplication. There are two possible solutions for multiband and multimode radio frontends (a) Narrowband tunable LNAs (b) Wideband highly linear LNAs. A dual bandtunable LNA MMIC has been fabricated in 0.2μm GaAs process. A self tuningtechnique has also been proposed for the optimization of this LNA. This thesis alsopresents the design of a novel highly linear current mode LNA that can be used forwideband RF front ends for multistandard applications. Technology process for thiscircuit is 90nm CMOS.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2008. 120 p.
Series
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1379
Keyword
Microwave circuits, phase shifters, programmable circuits, active corporate feed network, four-port circuit, generic cells, phase shift capability, programmable microwave function array, tunable recursive filter
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-14864 (URN)LiU-TEK-LIC-2008:37 (Local ID)978-91-7393-815-0 (ISBN)LiU-TEK-LIC-2008:37 (Archive number)LiU-TEK-LIC-2008:37 (OAI)
Presentation
2008-09-12, Glashuset, Campus Valla, Linköpings universitet, Linköping, 10:15 (English)
Opponent
Supervisors
Available from: 2008-09-26 Created: 2008-09-26 Last updated: 2009-04-22Bibliographically approved

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Ahsan, NaveedDabrowski, JerzyOuacha, Aziz

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