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The conducted RF immunity of microcontrollers is sometimes strongly frequency dependent. This paper discovers one origin of the frequency behavior of the immunity of microcontrollers against electromagnetic disturbances on oscillator pins. The behavior is explained by considering resonances in current loops through oscillator pins. The proposed theory is verified by systematically measurements.
This paper describes the origins of one kind of the degradation of the electromagnetic immunity of microcontrollers. That immunity degradation is strongly frequency dependent. They appear like holes in immunity-frequency curve. Mechanism based on resonance in two types of current loops is introduced to explain the formation of those immunity holes. Measurement results are given to support the introduced...
This paper presents an approach to constructing the immunity model of the microcontroller based on functional blocks. The microcontroller is treated as an assembly of functional blocks and propagation paths of electromagnetic interference. Function blocks are I/Os and cores where the interference propagation paths are referred to interconnections such as packages and on-chip power distribution network...
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