<p>The goal of this final year project is to investigate various techniques to up-convert a baseband signal into radio frequency signals, and to investigate the practical problems encountered in an offset phase locked loop design by implementation. </p><p>Phase locked loops are commonly used in radio transmitters and receivers to generate accurate RF signals from a low-frequency reference. This thesis will highlight some of the problems and strengths of various up-conversion schemes, and suggest an offset-PLL architecture free from many of those problems. </p><p>An offset-PLL is often used in mobile communication systems where the required levels of out of band transmission are tough and the use of superheterodyne up-conversion cannot be used due to spectrum or bandwidth requirements. </p><p>However a drawback of an offset-PLL is the high locking time; this can render the offset-PLL useless in TDMA communication systems. This problem among others has been studied theoretically as well as practically on an actual implementation of an offset-PLL for mobile communications. The offset-PLL was designed and manufactured as part of this project.</p>
| Identifer | oai:union.ndltd.org:UPSALLA/oai:DiVA.org:liu-1838 |
| Date | January 2003 |
| Creators | Nilsson, Anders |
| Publisher | Linköping University, Department of Electrical Engineering, Institutionen för systemteknik |
| Source Sets | DiVA Archive at Upsalla University |
| Language | English |
| Detected Language | English |
| Type | Student thesis, text |
| Relation | LiTH-ISY-Ex, ; 3450 |
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