STMicroelectronics' new common mode filters have an extremely wide differential bandwidth of 10.7 GHz to protect antenna sensitivity in wireless circuits adjacent to the latest serial digital interfaces.
The 2-channel ECMF2-40A100N10 and 4-channel ECMF4-40A100N10 support high-speed interface standards including USB 3.2 Gen 2, USB4, HDMI 2.1, and DisplayPort. With their low serial resistance of just 3Ω, which minimizes eye diagram distortion, the filters preserve signal integrity.
The filters provide deep common mode attenuation (Scc21) from 2.4 GHz to 7 GHz, reaching -21 dB at 5 GHz, and effectively prevent interference with Wi-Fi and Bluetooth receivers.
In addition to resolving antenna insensitivity issues, filters can be used for general interface noise reduction to ensure compliance with electromagnetic compatibility (EMC) regulations. ESD protection of up to ±9kV (contact discharge) and ±20kV (air discharge) is also integrated, which exceeds IEC 61000-4-2 level 4.
Both filters are housed in compact lead-free micro quad flat (µQFN) packages measuring just 0.5 mm in height and are suitable for demanding industrial applications as well as consumer products. They are suitable for protecting smart factory equipment, imaging systems, medical devices, laboratory equipment, home automation systems, set-top boxes, smart televisions, game consoles, notebooks, tablets and docking stations.
Evaluation boards are available and offer a choice of SMA connector or USB-C connector to provide a convenient connection to test equipment to explore filter performance.