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A Switch Mode Resonating H-Bridge Polar Transmitter using RF Sigma Delta Modulation
KTH, School of Information and Communication Technology (ICT), Electronic Systems.
KTH, School of Information and Communication Technology (ICT), Electronic Systems.
KTH, School of Information and Communication Technology (ICT), Electronic Systems.
2010 (English)In: IEEE INT SYMP CIRC SYST PROC, 2010, 1911-1914 p.Conference paper, Published paper (Refereed)
Abstract [en]

Using saturated power amplifier (PA) as the last stage, polar transmitter has the potential to be the most power efficient architecture to transmit large Peak-to-Average Ratio (PAR) signals. In this work, a polar transmitter using H-Bridge configured Class-D amplifiers is proposed. To fully exploit low voltage resource, maintain linearity and meet the spectrum mask requirements, RF Sigma-Delta Modulation (SDM) is used. An on-chip transformer based filter network is designed to filter out SDM noise and provide load matching. The system verification is carried out by using Matlab passband simulation on a 13dB PAR mobile WiMAX signal. Evaluation of noise shaping and spectral regrowth shows the proposed architecture can achieve -45dBc/10kHz ACPR in a 140MHz bandwidth range. This provides a solid ground for the circuit design work.

Place, publisher, year, edition, pages
2010. 1911-1914 p.
Series
IEEE International Symposium on Circuits and Systems, ISSN 0271-4302
Keyword [en]
Polar Architecture, Sigma-Delta Modulation, Class-D Power Amplifier
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-32139DOI: 10.1109/ISCAS.2010.5537969ISI: 000287216002034Scopus ID: 2-s2.0-77955995322ISBN: 978-1-4244-5309-2 (print)OAI: oai:DiVA.org:kth-32139DiVA: diva2:409264
Conference
International Symposium on Circuits and Systems Nano-Bio Circuit Fabrics and Systems (ISCAS 2010)
Note

QC 20110407

Available from: 2011-04-07 Created: 2011-04-07 Last updated: 2013-01-29Bibliographically approved
In thesis
1. All Digital Polar Transmitter Design for Software Defined Radio: Architecture and Low Power Circuit Implementation
Open this publication in new window or tab >>All Digital Polar Transmitter Design for Software Defined Radio: Architecture and Low Power Circuit Implementation
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The evolving wireless communication technology is aiming highdata rate, high mobility, long distance and at the meantime, co-existwith various different standards. This developing trend requires ahighly linear transceiver system and it causes the problem of lowefficiency due to the large crest factor of signals. On the other hand,with process scaling, digital blocks are occupying more functions andchip area than before, to fully utilize the digital process low poweradvantage and save design cost, hardware reuse is preferable. Theconcept of Software Defined Radio (SDR) is raised to make thesystem more adaptable to multiple communication standards withminimal hardware resources.

In this doctoral dissertation work, the software defined radioarchitecture especially the all-digital polar transmitter architecture isexplored. System level comparison on different transmitter topologiesis carried out in the first place. Direct conversion, out-phasing andpolar transmitter topologies are compared. Based on the system levelevaluation, a Lowpass Sigma Delta Modulation (LPSDM) digitalpolar transmitter is designed under 90nm CMOS process andpackaged in QFN32. 19.3% peak efficiency and 11.4dBm outputpower is measured under single 1.0V supply. The constellationmeasurement achieved 5.08% for 3pi/8PSK modulation and 7.01%for QAM16 modulation output. The measurement on the packagedtransmitter AM/AM and AM/PM also demonstrated the linearity andpower efficiency performance under low voltage environment. This verified the possibility for a fully SDR solution in the future.

As a specific application and genuine creation, the UHF RFIDstandard is mapped into digital polar transmitter architecture. System level simulation is performed and transient signal parameters areextracted. To prove the SDR possibility, the system is fully designedby VHDL language and downloaded into FPGA hardware with highspeed serial port. The measured results confirm the possibility of thedigital polar transmitter architecture potential in SDR systemrealization.

Based on the design and verification of two different systems, themethodology for digital implementation of linear transmitter systemis developed and the skill to carry out optimization and measurementis also possessed. In conclusion, the academic publication andverification proved the feasibility of digital polar transmitterapplication in linear system and point out the direction for a fullySDR realization.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2012. xviii, 96, 13, 17 p.
Series
Trita-ICT-ECS AVH, ISSN 1653-6363 ; 12:10
Keyword
Switching Power Amplifier, All Digital Polar Transmitter, Lowpass Sigma Delta Modulation, Software Defined Radio, RFID, H-Bridge Architecture, Resonating, Filter Matching Network.
National Category
Computer Systems
Research subject
SRA - ICT
Identifiers
urn:nbn:se:kth:diva-116861 (URN)978-91-7501-614-6 (ISBN)
Public defence
2013-02-22, Forum Sal-D, Isafjordsgatan 39, Kista, 09:00 (English)
Opponent
Supervisors
Projects
iPack
Note

QC 20130129

Available from: 2013-01-29 Created: 2013-01-28 Last updated: 2013-01-29Bibliographically approved

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