emi filter and filtered connector options for your...
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EMI Filter and Filtered Connector Options for your application
By Bob Ydens
President
EMI Solutions Inc
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Types of Filters
Filter inserts:Press in filters added to an existing system, providing decoupling capacitors on each pin.
Filtered connectors: Filtering being built into the already selected connector
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Types of FiltersFeed Through Filters: Simple implementation used when the signal or power passes through a bulkhead without any connectors.
• Press In/Threaded
• Solder In
• Power
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Types of FiltersFilter Modules: Common filtering devices with various forms of filters and transient suppression built into a module as opposed to a single connector.
• Standard AC Filters
• High Power Filters (AC and DC)
• Custom Filtering
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Types of Low Pass FiltersC filters - pure capacitive filter
• Chip Capacitor
• Discoidal / Feed thru
• Planar Array
CL/LC filters - combined inductance and capacitance filtering
Pi filters – Capacitive and Inductive filtering, named due to the shape resembling the pi symbol, π
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When to use a C Filter
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When to use a L-C Filter
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When to use a C-L Filter
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Noise Filtering vs Frequency
• Identify the capacitance of the filter to operate in the correct frequencies
• Select the capacitance so that it doesn’t interfere with designed signals
• Determine the type of filter (Notch or Broadband) that meets the frequency spectrum required in your application
• Choose optimum capacitance based on -3dB Cutoff Frequency of the filter
Low Pass Filters
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Understanding the -3dB Cutoff Frequency
• Formula for Cutoff Frequency
• Equivalent Circuit and Performance vs Frequency
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Calculated Cutoff Frequency Data
Capacitance 470 pF 10,000 pF
C 0.000470 0.010
2*P 6.28 6.28
R 0.000022 0.000022
Fc 15,399,967 723,798
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Industry Data
ALWAYS DO A SANITY CHECK!!
Benchmark calculations vs
published industry data!*
* Table courtesy of Syfer
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Actual Measured Chip Capacitor Data – 470pF
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10,000pF and
22,000pFchip capacitor
Actual Measured Data
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Chip Capacitor Filter Performance
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Self-Resonance
• Inherent to chip capacitors
• GREATLY impacted by mechanical packaging
• Creates “Notch Filter”
• Little to no high frequency performance
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Filter Connector Performance Comparison
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How chip cap filtered connectors are made
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How Pi filtered connectors are made
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How planar filtered connectors are made
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Voltage Considerations
Working Voltage: What voltages are your signals?
Rated Voltage: What voltage rating do you need for safety margin?
Dielectric Withstand Voltage: What voltage should the ceramics be able to withstand for 5 seconds?
Transient Voltage: Is your system susceptible to transient voltages?
Lightning: Is the system exposed to lightning? If so, what level?
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Additional Options
• Grounding
• Lightning protection
• TVS protection
• Combo filters
• Double Pi filters
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Using Filter Inserts for Debugging
Verify:• Grounding
• Capacitance
• Filter Frequency Band
Broadband filter
Upgraded voltage
Customize (grounds, resistors, diodes, overall configurations)
High performance filtered connector
Free Filter Insert Samples!
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Real Life Example
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10,000pF Chip Capacitor Insert
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22,000pF Chip Capacitor Insert
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22,000pF FlexFilter Insert