21st November 2006

World’s First CMOS TD-SCDMA Transceiver

Comlent Technology Inc has announced that it has started sampling RFIC transceiver and analog baseband (ABB) chipset in advanced CMOS technology for TD-SCDMA, claimed to be the world's first in its kind.

The company's 3G transceiver design is very indicative of rapid acquaintance of high-end chip design capability by China based design houses in recent years. The chipset includes a single chip transceiver CL4020 that uses a direct-conversion architecture that integrates the voltage-controlled oscillator (VCO), fractional-N phase-locked loop (PLL), a receiving channel select filter and a transmit driver amplifier and an analog baseband (ABB) chip CL4520 that uses digital signal processing (DSP) to compensate for the imperfections in the analog channel-select filter and to perform dc-offset cancellation.

The transmit channel achieves the root mean square (RMS) of the error vectors, EVM, of less than 4%. The phase locked loop integrated phase noise from 1KHz through 640KHz achieves 0.85 degree and noise figure of whole receiving channel is below 4dB, to name a few performance indicators. The testing was conducted in Agilent-Comlent TD-SCDMA RF Labs, the only such RF testing lab for TD-SCDMA in Asia. Nearly a dozen inventions have been disclosed during the development of this chipset. Most of them are being filed for patents in both China and the US.

Before this, TD-SCDMA transceivers provided by two foreign companies were both BiCMOS technology based and cover only one of the two allocated frequencies (1880 - 1920MHz and 2010 - 2025MHz) to TD-SCDMA in China. CL4020 is claimed to be world's first dual-band CMOS TD-SCDMA transceiver that also lifts China's final bottleneck of domestic TD-SCDMA equipment and chip supplying chain. RF transceiver has been identified as the bottleneck of domestic industrial base by China for both TD-SCDMA and other modern wireless communications.

Web: www.comlent.com