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Solution for 3G, WiMAX base stations suits Freescale RF transistors

Posted: 10 Apr 2006 ?? ?Print Version ?Bookmark and Share

Keywords:TC8242? transmit linearizer board? TC0003? test and development? Freescale?

TelASIC Communications announced the availability of transmit subsystems for high-speed downlink packet access (HSDPA)/W-CDMA, EVDO/CDMA2000 and WiMAX base station radios using adaptive digital linearization technology, which is tuned for Freescale Semiconductor's RF power amplifiers (PAs). A digitally-linearized PA is said to increase power efficiency and reliability over traditional analog linearization techniques.

The company said that it has fine-tuned its solution to maximize power efficiency, achieving 45 percent at the output stage while maintaining 55dB ACPR (adjacent channel power ratio) for 3G air-interfaces. The entire PA chain efficiency achieved, including driver, pre-driver and output stages, is said to be 38 percent with 55dB ACPR.

TelASIC offers a transmit linearizer board (TC8242) for 1-4 carrier HSDPA/WCDMA and 1-15 carrier EVDO/CDMA2000 applications, based on its internally-developed ICs that implement adaptive digital predistortion (DPD) technology tuned for Freescale transistors. TelASIC also offers a DPD-friendly PA test and development system (TC0003), which uses the transmit linearizer board along with performance analysis software, to assist designers in optimizing their DPD-friendly PA line-ups using Freescale's RF power transistors. The TC8242 sample boards are priced at $5,000. The TC0003 DPD-friendly PA test and development system is priced at $35,000. Both products are already available.

According to TelASIC, base station OEMs have primarily been using analog solutions for power amplifier linearization for radio design. Radios based on analog techniques are said to be power-hungry because of the low (8-10 percent typical) power efficiency. High power efficiency is needed for next-generation distributed RF network architectures where a high-capacity radio server is connected to low power-consuming and small-footprint remote radio heads (RRH).

The solution aims to address the need for such high power efficiency. It touts higher reliability as all components used for correcting the PA non-linearity are fully digital. TelASIC said that the linearization process is adaptive in nature, automatically correcting for drift in PA characteristics in the field.

"Over the next five years, over one billion subscribers will be migrating from voice-centric 2G services to ARPU-rich TV/video/audio/data-centric 3G services," said Ashis Khan, vice president of sales and marketing for TelASIC. "Several operators are planning to deploy RRH to meet high data rate, low latency, and hole-free coverage for multimedia services. The RRH require efficient power amplifiers to lower costs, minimize power consumption, reduce weight, increase reliability and eliminate the requirement for periodic PA tuning in remote locations. Our PA solutions enable OEMs to meet these goals in their RRH design."

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