Datasheet

Chip Ferrite BeadChip EMIFILr
Chip Common Mode Choke Coil
Block Type EMIFILrMicrowave Absorber
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C31E.pdf
09.4.20
49
Frequency (MHz)
30 30050 100 150 200 250
45
85
50
55
60
65
70
75
80
Level (dBµV)
Frequency (MHz)
30 30050 100 150 200 250
45
85
50
55
60
65
70
75
80
Level (dBµV)
Frequency (MHz)
30 30050 100 150 200 250
45
85
50
55
60
65
70
75
80
Level (dBµV)
AC04
AC00
1MHz
Measuring Circuits
Filter
Measuring Point
Pattern20cm
Waveform Distortion Suppressing
Performance of BLMppR Series
Type of Filter EMI Suppression Effect / Description
Initial
(No filter)
Resister (47Ω)
is used
BLM18RK221SN1
(220Ω at 100MHz)
is used
Ringing is caused on the signal waveform.
Such ringing contains several hundred MHz harmonic components and generates noise.
Signal waveform (100nsec/div, 2V/div) Expand (10nsec/div, 2V/div) Spectrum
Comparing initial waveform, ringing is suppressed a little.
However there still remains high level waveform distortion.
Signal waveform (100nsec/div, 2V/div) Expand (10nsec/div, 2V/div) Spectrum
BLM18R has excellent performance for noise suppression and waveform distortion suppression.
BLM18R suppresses drastically not only spectrum level in more than 100MHz range but waveform distortion.
Signal waveform (100nsec/div, 2V/div) Expand (10nsec/div, 2V/div) Spectrum
EMI
Suppression
Effect
BLMppR Series