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Noise canceller improves cellphone signal sensitivity

Posted: 10 Sep 2007 ?? ?Print Version ?Bookmark and Share

Keywords:noise canceller? cellphone signal? signal sensitivity?

Quellan Inc. has announced the QNx220, an RF noise canceller for advanced mobile communications products.

Based on Quellen's patented CSP noise canceling technology, the ultrasmall CMOS IC cancels unwanted RF interference to improve receiver sensitivity. In a weak signal area a cellphone using the QNx220 can recover several bars of lost signal strength and a GPS receiver can obtain a location lock in just seconds rather than minutes.

The QNx220 actively cancels interference by inverting and electronically subtracting emulated local noise signals from the receiver input signal. Gain and phase of the cancellation signal are continuously adjusted for optimum performance.

The QNx220 complements the QNx100 with a digital control interface for direct connection to SPI baseband processors, and a dual stage LNA for increased noise source sensitivity. The QNx220 is extremely small for ease of integration, measuring less than 1mm on a side. The device is available in a CSP for RF modules or in a QFN package for direct on-board use.

- Ismini Scouras

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