Tag Archives: filter

I was concocting a rather silly low-pass filter design, when I remembered that Messrs Sallen and Key did it better in the 1950s, and decided to use their two-pole design to implement a Butterworth filter (thank you also Mr Butterworth). Wonderfully, there are free Sallen and Key Butterworth filter calculators on the web now – I used the one on ...

Emis has created a range of three phase, dual stage EMC filters designed for industrial motor and drive systems across 5 to 170kW. TMF3221 and TMF3222 “are housed in a space-saving slim book-shelf enclosure which may be installed next to inverters, converters or motor drives”, according to the company. “The devices are designed to meet the needs of power drive ...

A University of Pennsylvania team has turned to yttrium iron garnet to build a non-volatile microwave filter than can be tuned across 3.4 to 11.1GHz. “What’s special about YIG is that it propagates a magnetic spin wave,” said research engineer Troy Olsson. The team is researching filters for 6G communication in ‘frequency range 3’ – FR3, 7 to 24GHz. “At these ...

Akoustis Technologies, a maker of RF bulk acoustic wave (BAW) filters, has launched foundry service making filters for wireless markets including phones, Wi-Fi, military, 5G infrastructure and automotive. Using 150mm silicon substrates, its process, XB1, covers 1.6 to 7GHz and can handle up to 4W CW (continuously) – plus it has XP3F in the pipleline aimed at 7 to 20GHz ...

Liverpool-based defence electronics manufacturer MPE has certified its HEMP (high altitude electromagnetic pulse) protection filters to the latest defence standard, Mil-Std-188-125-1A “becoming the only manufacturer in the world to do so”, it claimed. Independent testing was by Jaxon Engineering and Maintenance of Colorado Springs (Jaxon team left). The filters span 16A to 1.2kA and including two, three and four-line options. ...

Johanson Technology had announced surface-mount filters to help Wi-Fi 5, Wi-Fi 6E and Wi-Fi 7 co-exist. 5500BP44A0700 (right) comes in a 4.5 x 3.2mm 1812 package and passes 5.1 to 5.8GHz while offering 50dB attenuation to the 6GHz Wi-Fi band. It can handle 3W (CW) and operates over -40 to +85°C 6100BP14A1995 is a 6.1GHz band pass filter in a ...

Murata has introduced a series of chip ferrite beads with a 20A current rating, aiming them at the battery charging systems and powertrains of electric vehicles, as well as in industrial equipment. Called the BLE32SN series, its members are 3.2 x 2.5 x 2mm (1210 or metric 3225) and operate over -55 to +125°C or -55°C to +150°C. “By leveraging ...

Smiths Interconnect has released a series of high frequency surface mount chip equalisers for controlling gain variation up to 40GHz with a maximum slope of 4dB. Called the CEX series, the parts combine thin-film and thick-film processing, offer multiple slope (1-4 dB) and band options. They come in standard and high-frequency versions. In the high-frequency types (see photo) Slope linearity of ...

Nexperia has announced the PCMFxUSB3BA, a common mode filter (choke)/ ESD protection combination. The filter features a differential passband of up to 10GHz 3dB frequency and surge robustness up to 7.5A 8/20µs. It’s designed to suppress common mode and single-ended noise while minimizing the impact on the signal integrity of extremely fast data lines. Developed to meet the requirements of ...

TDK-Lambda has announced quarter brick EMC filters with a rating of ±40Vdc at 20A and a choice of flanged or non-flanged baseplates. Called the FQA series, they are intended for harsh and demanding environments including MIL-COTS vehicle and airborne. Differential and common mode noise attenuation is described as sufficient to simplify system level compliance to MIL-STD-461G by the firm, and input spike protection is ...