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EMI-shielding Class D amplifier targets portable audio systems

Posted: 01 Oct 2010 ?? ?Print Version ?Bookmark and Share

Keywords:smartphone? docking system? sound bar?

Silicon Laboratories Inc. introduced a new 5W stereo Class D amplifier, the Si270x, which is targeted at smartphone docking stations, tabletop radios, TV sound bars and monitors, boom boxes and battery-powered radios.

The company says that this is the first time that a Class D amplifier effectively shields EMI emissions for operation with inexpensive filters in radios.

Silicon Laboratories Si270x amplifier

It suppresses traditional Class D interference at its source using multi-layer EMI mitigation technology to allow the AM/FM radio and the smartphone to co-exist. Silicon Labs said the Si270x amplifier reduces radiated interference by 10X in the EMI compliance band, by 100X in the FM radio band and by 1000X across the AM band.

Developers can use it to reduce the size of portable audio systems without reducing performance. According to the company, systems using the Si270x can play 2.5 times longer than those using Class A/B amplifiers while using half the number of batteries.

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