Product category:
Analogue and Mixed Signal ICs
News Release from: Quellan | Subject: QNx220 RF noise canceller
Edited by the Electronicstalk Editorial
Team on 05 September 2007
RF noise canceller improves receiver
sensitivity
In a weak signal area a mobile phone using the QNx220 can recover several bars of lost signal strength.
Quellan has released the QNx220 RF noise canceller for advanced mobile communications products Based on the company's CSP noise cancelling technology, the CMOS IC cancels unwanted RF interference to improve receiver sensitivity
This article was originally published on Electronicstalk on 12 Dec 2005 at 8.00am (UK)
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In a weak signal area a mobile phone 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.
Specifically designed for mobile and stationary platforms where electromagnetic noise impairs reception, the Quellan 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.
This is especially effective with closely spaced antenna radiation, internal processor noise, and camera and display noise.
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 measures less than 1mm3.
The device is available in a chip scale package for RF modules or in a QFN package for direct on-board use.
"Noise cancellation has traditionally been limited to the audio spectrum", said Tony Stelliga, Quellan's Chairman and CEO.
"By removing noise at the RF antenna level in the electromagnetic spectrum, a massive improvement in user experience beyond audio - including video, signal clarity and location accuracy - can be achieved".
"These improvements are impossible to achieve with conventional circuitry or signal processing techniques".
"The Quellan approach to the evasive noise problem is very innovative and profound, leading to an inexpensive solution for highly-converged mobile phone systems", comments Kenji Tsuda, a Semiconductor Technology Analyst based in Tokyo.
"Quellan's noise cancellers will greatly increase signal clarity even in weak-signal environments such as underground roadways or in high rise buildings".
"Moving forward, we'll see a wide variety of functional capabilities in a wireless system with Quellan's noise cancellation, so consumers will enjoy clear high-quality calls and mobile TV experience".
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