Jaeger, MarvinMarvinJaegerSchulz, SimonSimonSchulzKoelpin, AlexanderAlexanderKoelpin2026-06-232026-06-232026-0317th German Microwave Conference, GeMiC 2026https://hdl.handle.net/11420/63599Qubit implementations like trapped ions can be controlled by microwave signals in the gigahertz range, which require a local oscillator (LO) for upconversion. The LO superimposes a static frequency offset and phase noise, both leading to errors in qubit gate operation. Both error terms can be reduced by implementing the LO as an integer-N frequency synthesizer, where a phase-locked loop controls and stabilizes the frequency. An exemplary integer-N frequency synthesizer is realized and its performance for quantum computers is characterized in this work. The qubit fidelity calculated based on phase noise measurement results is above 99.943% for primitive π-gates.enFidelityinteger-N synthesizerlocal oscillator (LO)phase noisequantum computersynthesizertrapped ionNatural Sciences and Mathematics::537: Electricity and ElectronicsConference Paper10.1109/GeMiC71240.2026.11516354