Summary

International Symposium on Electromagnetic Compatibility

2009

Session Number:22Q3

Session:

Number:22Q3-7

Programmable PLL Impact on EMC Behavior

S. Y. Yuan,  H. I. Wang,  C. C. Chen,  

pp.437-440

Publication Date:2009/7/20

Online ISSN:2188-5079

DOI:10.34385/proc.14.22Q3-7

PDF download (458.1KB)

Summary:
This paper discuss the electromagnetic compatibility (EMC) effect of a programmable phase-locked loop (PLL). The international electrotechnical commission (IEC) 61967-2 measurement standard is followed to measure the electromagnetic interference (EMI) by TEM-CELL. Comparisons are done among EMI behaviors and different PLL settings of the same functionality. Different measurements are done to confirm the stability and repeatability. Generally, the measurements and observations are reasonable across the bandwidth ─ the higher the PLL frequency the higher EMI. However, at some frequencies, the phenomena are reversed. Thus, it is possible to control PLL by program to change the behavior of EMI and reduce EMI at specific frequencies by software which may save the hardware cost.