Synthesizer modulation for wideband FM generation

[摘要] ENGLISH ABSTRACT:The high performance of present digital phase-locked loops makes itthe preferred choice for the generation of stable, low noise, tunable localoscillators in wireless communications applications. Most transmittersuse superheterodyn techniques for up-conversion of the modulated signalto the required transmission frequency. Another technique is to inject themodulation signal into a phase-locked loop and consequently generate afrequency modulated signal directly at the transmission frequency.The aim of this study is to obtain a synthesizer configuration for theeffective generation of wideband FM, considering both passive and activeloop filters. The selection is based on synthesizer output signal quality,settling time and loop response to the modulation signal.

[发布机构] Stellenbosch University