BLM21AG601SN1

Manufacturer Part NumberBLM21AG601SN1
ManufacturerMurata
BLM21AG601SN1 datasheet
 
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Page 159/163:

Capacitive Noise Suppression

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!Note
Please read rating and !CAUTION (for storage, operating, rating, soldering, mounting and handling) in this PDF catalog to prevent smoking and/or burning, etc.
!Note
• Please read rating and !CAUTION (for storage, operating, rating, soldering, mounting and handling) in this catalog to prevent smoking and/or burning, etc.
This catalog has only typical specifications. Therefore, you are requested to approve our product specifications or to transact the approval sheet for product specificaions before ordering.
• This catalog has only typical specifications because there is no space for detailed specifications. Therefore, please approve our product specifications or transact the approval sheet for product specifications before ordering.
Noise Suppression Principles by DC EMIFILr
Continued from the preceding page.
4. Capacitive Noise Suppression
When a capacitor is connected (bypass capacitor) to
ground from a noisy signal line or power line, the circuit
impedance decreases as the frequency increases. Since
noise is a high frequency phenomenon, it flows to ground
if a capacitor has been connected to ground, thereby
making it possible to eliminate noise. (See Fig.)
EMI suppression filters employing a capacitor in this way
are used to eliminate this type of noise.
5. High frequency Capacitor Characteristics Used
for EMI Suppression Filters
Even general-purpose capacitors can be used for noise
suppression. However, since noise has an extremely high
frequency range, general-purpose capacitors may not
function as effective bypass capacitors, due to the large
residual inductance built into the capacitor.
All the capacitors used in MURATA's EMI suppression
filters employ a 3 terminal structure or thru-type structure,
which functions effectively even at high frequencies,
thereby minimizing the influence of residual inductance.
Consequently, an effective filter circuit can be formed
even at frequencies exceeding 1GHz. (Refer to Fig.)
6. Inductive Noise Suppression
When an inductor is inserted in series in a noise
producing circuit (See Fig.), its impedance increases with
frequency. In this configuration it is possible to attenuate
and eliminate noise components (high frequency
components). The MURATA EMI suppression filter
functions in this way.
158
[Capacitive Noise Suppression]
1
Noise+Signal/DC Power
Noise
Z =
2 fc
f : Frequency
c : Capacitance Value
[Equivalent circuit of general-purpose capacitor and 3
terminal capacitor in the high frequency area and
comparison of insertion loss]
(a) Construction of capacitor
2-terminal capacitor
3-terminal capacitor
Dielectric
Electrode
Lead
(b) Equivalent circuit of capacitors which is concerning ESL effect.
(c) Improvement of Insertion Loss Characteristics
0
C=2200pf
20
40
60
80
1
5
10
50
100
Frequency [MHz]
[Inductive Noise Suppression]
Noise
Noise+Signal/DC Power
Z =
2 fL
f : Frequency
L : Capacitance Value
Continued on the following page.
C31E9.pdf 03.3.12
Signal/DC Power
Dielectric
Electrode
Lead
500 1000
Signal/DC Power