EMC Question of the Week: October 21, 2024
Peaks in the radiated emissions from an electronic device are well above the CISPR 32 limit at 350, 370, and 390 MHz. They are found to be due to a 10-MHz signal from a clock driver that is distributed to two CMOS components on a 15-cm by 10-cm circuit board. Based on this information alone, there are at least two obvious deficiencies in this design, one of which is that the clock signal
- transition time is too fast
- is not matched
- is routed on an outer layer
- passes between resonant planes