Texas Instruments has introduced a single-chip wireless transmit processor that combines digital up-converter (DUC), crest factor reduction (CFR), and digital pre-distortion (DPD) linearisation functions. The GC5322 increases the efficiency of multicarrier power amplifiers (PAs) in the RF transmit signal chain and eliminates the need for more costly high-performance RF power amplifier components. This enables base-station OEMs to achieve power efficiencies of 25% or more for Class AB PAs and reaching 40% or more for Doherty PAs.
Increased subscriber demand for wireless service, within limited licensed RF spectrum, has forced base-station OEMs to adopt wideband, complex, spectrally efficient modulation schemes to increase voice and data capacity over cellular networks. These signals are more sensitive to distortion. As a result, multicarrier PAs operate well below saturation, where they are much less efficient. RF systems engineers must compensate for this reduced efficiency by utilising more expensive components in the RF power amplifier subsystem design.
The advanced DPD linearisation technology of the GC5322 significantly reduces the requirements that would otherwise be placed on the base-station power amplifier. It processes composite input bandwidths of up to 40 MHz 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 linearisation algorithm supports multiple power amplifier architectures and emerging standards, such as CDMA2000, W-CDMA, TD-SCDMA, OFDMA (WiMAX, LTE), HSPA and HSPA+.
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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