As electronic devices, cell phones, of course, are often faced with the problem interference (interference) from other frequencies, especially with the development of features, the phone is currently widely adopted multi-frequency in one handset. As a result of the interference, the performance of mobile phones can be compromised, some indicators can be seen from the weak received signal bar, often drop the call to voice reception quality is far from clear. When you have so happens, mobile phone users would be the aggrieved party.
Several solutions have been made to address the problem of interference, one with a chip buried in the component PCB (printed circuit board) for mobile phones. The concept was developed by Quellan Inc.., A company that produces analog integrated circuit (IC) of Santa Clara, California, USA. Solutions offered Quellan the break frequency dikendaki not received by the antenna when the phone. Solution Quellan trade labeled Noice canceller IC. This chip's ability to diagnose multiple frequencies, including GSM, GPS, CDMA, DVB-H, ISDB-T, WiFi, Bluetooth and various protocols that have frequencies up to 3GHz.
Chip Noise canceller works by sorting the incoming frequency according to specifications used on mobile phones. The main components used are CE (Channel Emulator) and two LNA (Low Noise Amplifier) in the sampling path. Quellan introduce three types of noice canceller chip variants, namely QHx100 narrowband, adaptable and QHx230 QHx220 settable. Version tarbaru QHx230 successfully tested to amplify the GPS signal reception on the console at CES (Consumer Electronic Show) 2009 in Las Vegas, USA.
Chip Architecture Noice canceller
"With this sophistication, we hope to market the noice canceller chip to the OEM (original equipment manufacture) mobile phone," said Philip Gadd, Vice President of Marketing Quellan. Besides can be embedded in mobile phones, noice canceller chip is also able to install on devices such as laptops, gaming consoles and portable digital TV. Another advantage offered, the chips used relatively energy efficient with consumption less than 12 milli-Watts. Plus noice canceller chip size relatively ultra small, which is only 9 square millimeters with 15 dBm noice cancellation. The entire system is designed to withstand the chip in the temperature range of -40 to 85 degrees Celsius. (Haryo Seno Adjie Nogo)