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filters

What’s the difference between equalizers?

May 5, 2022 By Jeff Shepard

Equalizers are used to alter the performance of signal chains. In some cases, that means linearizing signal chain performance. In other cases, equalizers are used to introduce nonlinearities. As a result, equalizer designs vary widely from simple passive circuits to complex multi-stage designs and active circuits. This FAQ reviews equalizer basics, looks at equalizers for […]

Filed Under: Analog ICs, Applications, FAQ, Featured, filters, Products, Telecommunications, Wireless Tagged With: FAQ

What are reflectionless filters? Part 4: Implementations

March 18, 2022 By Bill Schweber

Standard filters reflect unwanted stopband energy, but reflectionless filters present a seamless impedance across both stopband and passband which greatly improves performance of the RF signal chain. Filters are an area of intense interest, analysis, simulation, and often physical fabrication along with tests and academic papers. Yet, for hands-on design engineers, it’s important to be […]

Filed Under: Applications, FAQ, Featured, filters, Products, Wireless Tagged With: FAQ

What are reflectionless filters? Part 2: The need

March 17, 2022 By Bill Schweber

Standard filters reflect unwanted stopband energy, but reflectionless filters present a seamless impedance across both stop band and pass band which greatly improves performance of the RF signal chain. The higher frequency world of hundreds of megahertz and into gigahertz is very different than the low-frequency world. It is a world where design tools such […]

Filed Under: Applications, FAQ, Featured, filters, Products, Wireless Tagged With: FAQ

What are reflectionless filters? Part 1: Context

March 16, 2022 By Bill Schweber

filters

Standard filters reflect unwanted stopband energy, but reflectionless filters present a seamless impedance across both stopband and passband which greatly improves performance of the RF signal chain. Filters are an inherent, inescapable, necessary component in electrical and electronic circuits. Modern systems would be impractical and likely impossible without filters, whether at low frequencies down to […]

Filed Under: 5G, Applications, FAQ, Featured, filters, Products, Telecommunications, Wireless Tagged With: FAQ

Notch filters boast built-in ESD protection function

March 15, 2022 By Redding Traiger

TDK Corporation announces the release of its newly developed AVRF041A150MT242 and AVRF061D2R4ST532 notch filters with ESD protection function. Volume production of these devices will begin in March 2022. The new notch filters are compliant with the IEC61000-4-2 Level 4 immunity standard. They are well suited to ensuring EMC requirements are met in the audio circuits […]

Filed Under: 5G, Audio, filters, IoT, Products, Telecommunications, Tools, Wireless Tagged With: tdkcorporation

The practical magical first-order analog filter: Part 1

August 27, 2021 By Bonnie Baker

Finding the right analog filter to build a sensor circuit doesn’t have to be complicated. Understandably, the plethora of filter options can be overwhelming. Also, selecting a less-than-ideal filter may result in compromises, potentially increasing system cost, or affecting performance. To help simplify filter selection, this series of blogs explore key considerations when assessing your […]

Filed Under: Analog ICs, FAQ, Featured, filters Tagged With: FAQ

An overview of filters and their parameters, Part 4: Time and phase issues

August 26, 2021 By Bill Schweber

Understanding how filters are characterized is the first step in choosing an appropriate topology with suitable specifications. Thus far, we have focused on filters primarily in terms of their frequency response. However, it is equally legitimate to look at their time-domain and phase-related performance, and in many cases, just as or even more important. Q: […]

Filed Under: Analog ICs, FAQ, Featured, filters, Products Tagged With: FAQ

An overview of filters and their parameters, Part 3: Key parameters

August 25, 2021 By Bill Schweber

filter parameters

Understanding how filters are characterized is the first step in choosing an appropriate topology with suitable specifications. This part looks at the basics of filter characterization and parameters. Q: What is an example of a very basic filter? A: The most common analog filter is the single-stage low-pass RC filter (Figure 1). It is often […]

Filed Under: FAQ, Featured, filters, Products Tagged With: FAQ

An overview of filters and their parameters, Part 2: Basic Concepts

August 24, 2021 By Bill Schweber

Understanding how filters are characterized is the first step in choosing an appropriate topology with suitable specifications. Filters are both a simple and also complicated and often confusing topic. This part clarifies some of the issues. Q: Why are so many discussions about filters so confusing? A: There are many reasons, but one is that […]

Filed Under: FAQ, Featured, filters, Products Tagged With: FAQ

An overview of filters and their parameters, Part 1: Context

August 23, 2021 By Bill Schweber

bandpass filters

Understanding how filters are characterized is the first step in choosing an appropriate topology with suitable specifications. Mention “filters” to electrical engineers of the older persuasion, and you’ll likely see a look of nostalgia mixed with fear. Why so? Because “back in the day” a course on filter theory was mandatory for nearly all EE […]

Filed Under: Analog ICs, FAQ, Featured, filters, Products Tagged With: FAQ

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