Thesis (MScEng)--University of Stellenbosch, 2002. / ENGLISH ABSTRACT: The high performance of present digital phase-locked loops makes it
the preferred choice for the generation of stable, low noise, tunable local
oscillators in wireless communications applications. Most transmitters
use superheterodyn techniques for up-conversion of the modulated signal
to the required transmission frequency. Another technique is to inject the
modulation signal into a phase-locked loop and consequently generate a
frequency modulated signal directly at the transmission frequency.
The aim of this study is to obtain a synthesizer configuration for the
effective generation of wideband FM, considering both passive and active
loop filters. The selection is based on synthesizer output signal quality,
settling time and loop response to the modulation signal. / AFRIKAANSE OPSOMMING: Die hoe werksverrigting van fase-sluit lusse maak dit die verkiesde keuse
vir die generasie van stabiele, lae ruis, verstelbare ossillators vir draadlose
kommunikasie toepassings. Meeste senders gebruik "superheterodyn"
tegnieke vir die op-menging van die gemoduleerde sein na die verlangde
uitsaai frekwensie. 'n Ander tegniek is om die modulasie sein in
'n fase-sluit Ius te voer en so doende 'n gemoduleerde sein direk by die
transmissie frekwensie te genereer.
Die doel van hierdie studie is om 'n sintetiseerder konfigurasie te verkry
vir die effektiewe opwekking van 'n wyeband FM sein, deur beide passiewe
en aktiewe Ius filters in konsiderasie te neem. Die seleksie geskiet gebaseer
op sintetiseerder uittree sein kwaliteit, sluit tyd en Ius gedrag as gevolg
van die modulasie sein.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:sun/oai:scholar.sun.ac.za:10019.1/49736 |
| Date | 12 1900 |
| Creators | Snyman, A. (Anton) |
| Contributors | De Swardt, J. B., Stellenbosch University. Faculty of Engineering. Dept. of Electrical and Electronic Engineering. |
| Publisher | Stellenbosch : Stellenbosch University |
| Source Sets | South African National ETD Portal |
| Language | en_ZA |
| Detected Language | English |
| Type | Thesis |
| Format | 143 leaves : ill. |
| Rights | Stellenbosch University |
Page generated in 0.0018 seconds