Texas Instruments Launches Highly Integrated Transmit Processor for Wireless Basestations

(Product News, 14 Feb 2008)

Texas Instruments Inc. (TI) has released a single-chip wireless transmit processor that combines digital upconverter (DUC), crest factor reduction (CFR), and digital pre-distortion (DPD) linearization functions. The GC5322 increases the efficiency of multi-carrier power amplifiers (PAs) in the RF transmit signal chain and eliminates the need for more costly high-performance RF power amplifier components. This enables basestation OEMs to achieve power efficiencies of 25 percent or more for Class AB PAs and reaching 40 percent or more for Doherty PAs.

Featuring advanced DPD linearization technology, TI's GC5322 wireless transmit processor significantly reduces the requirements that would otherwise be placed on the basestation power amplifier. The device processes composite input bandwidths of up to 40MHz and significantly reduces the Peak-to-Average ratio (PAR) of the input signals while also improving adjacent channel leakage ratio (ACLR). The flexible DSP-based pre-distortion linearization algorithm supports multiple power amplifier architectures and emerging standards, such as CDMA2000, W-CDMA, TD-SCDMA, OFDMA (WiMAX, LTE), HSPA, and HSPA+. By optimizing the PA performance, engineers will be able to meet the cost, linearity and efficiency goals of current and future radio card architectures.

Coupled with TI's TMS320C6727 DSP, the GC5322 offers basestation OEMs real-time processing power and the flexibility to modify the DPD algorithm to adapt to emerging wireless standards. The GC5322 is supported by a complete evaluation system, including high speed data converters, power solutions, clock synthesis, and high performance RF.

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