Résumé
This paper deals with the problematic of electromagnetic susceptibility of operational amplifiers and voltage controlled oscillators meant for a phase-lock loop circuit. Electromagnetic aggressions are injected through probes, hence without contact. They are however compared to results measured on devices subject to attacks injected in a driven mode. Different behaviours are observed, from voltage variations to oscillation frequencies synchronized on the aggression frequency. Results are presented versus aggression power, frequency and modulation.