Designing Lowpass Lumped Element Filter

What are filters?

Water filters? Usually that’s the confusion by laymen when talking about filters. Electronic filters are components in an electronic system that is used for isolating a bandwidth of frequency either to be used as a channel for data throughput or noise removal. Ever wonder why a radio can have so many stations? Wonder why each station is categorized by a specific frequency? That is because each station subscribe to a certain frequency channel. Electronic filters act to compartmentalize each station in its frequency channel. Without them, you cannot tune into a radio station. In fact, you might just hear every single radio station blasting into your ears at the same time!

This same concept works for TVs, mobile phones and even our internet services. Virtually anything that works with frequency spectrum requires filters for it to work properly.

Lumped filters

Lumped filters are filters consisting of lumped elements, mainly elements that are familiar to most of us, such as resistors, inductors and capacitors which are tangible and usually bigger in size. The reason they are called lumped is because the electronic properties and behaviors are all concentrated (lumped) into discrete components instead of distributed across the entire filter.

Lumped elements are relatively easy to construct and are generally used in lower frequency range. In higher frequency range, the parasitic inductance and capacitance in these discrete components will start to affect its behaviors and characteristic, causing distortion to its response as the frequency goes higher, making it increasingly unreliable.

Draw a Lowpass Lumped Filter with EDS

This week, we present a demo video on how to design a lowpass lumped filter using EDS. A lowpass filter attenuates frequencies after the cut-off point at the right side of its band, which means higher frequencies are removed while lower frequencies can “pass”. Attached also is the design document for your reference. We hope you enjoy designing your own lowpass lumped filter.

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