On-Board Type (DC) EMI Suppression Filters (EMIFILr)

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C31E.pdf
08.9.1
Noise EMI Suppression Effect Effect
!Noise Suppression in UHF Range
Testing Circuit
74HCU04
Measured radiation at 3m distance
74AC04
74HC00
1
BLM
10MHz
Type of Filter
EMI Suppression Effect
Description
Initial
(No filter)
Level (dBµV/m)
70
60
50
40
30
20
10
300 400 500 600 700 800 900 1000
Frequency (MHz)
70
60
Current BLM are effective in suppressing
noise in the range between 300MHz and
700MHz.
Conventional Type
BLM18AG102SN1
(1000Ω at 100MHz)
Level (dBµV/m)
50
40
30
Initial
20
10
300 400 500 600 700 800 900 1000
Frequency (MHz)
70
60
In addition to the effectiveness of current
BLM, BLM18HG suppresses noise in the
range beyond 700MHz.
for GHz Noise Suppression
BLM18HG102SN1
(1000Ω at 100MHz)
Level (dBµV/m)
50
40
30
Initial
BLM18AG102SN1
20
10
300 400 500 600 700 800 900 1000
Frequency (MHz)
Comparison between BLM18HG102SN1 and
BLM18AG102SN1 (Current Item)
2000
Impedance (Ω)
1500
1000
500
BLM18HG102SN1
BLM18AG102SN1
0
1 10
100 1000 2000
Frequency (MHz)
84