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TI Tx/Rx processors tip DPD tech base stations

Posted: 15 Feb 2011 ?? ?Print Version ?Bookmark and Share

Keywords:transmit/receive? processors? 3G? 4G? wireless?

Texas Instruments Inc. unveils the GC533x family of transmit/receive processors with digital pre-distortion (DPD) for 3G and 4G wireless base stations, remote radio heads and government communication systems.

The devices feature two turn-key processors that provide a complete and flexible digital transmit and receive solution for wide-bandwidth and multiantenna wireless base stations at a fraction of the cost of high-gate-count FPGAs, and without the time and investment required to develop a custom ASIC solution. A complete system evaluation and reference design kit is also available.

Tx/Rx processors tip DPD techThe GC533x family provides up to 148MHz of fifth order corrected transmit bandwidth with crest factor reduction (CFR), along with wideband digital up/down converters with fractional re-samplers, 48bit numerically controlled oscillators and automatic gain control that can support four transmit and eight receive antennas simultaneously. When combined with TI's TMS320C6748 floating point DSP, the GC533x platform offers customers a high-performance adaptive DPD algorithm or the ability to implement their own DPD IP.

The GC533x family members also enable power amplifier efficiencies as high as 40 percent in three carrier LTE operation with 54dB adjacent channel leakage ratio and 48dBm output. They deliver 20dB of ACLR improvement compared to uncorrected signals in wide-bandwidth applications and 40dB improvement in narrow-bandwidth applications while offering multichannel, multicarrier, multimode and multiband support for standards such as 3GPP, MC-GSM, WiMAX, WiBRO and 3GPP2.

They offer interfaces for up to four transmit and eight receive antennas and a real or complex observation path, enabling 2x2, 2x4, 4x4 and 4x8 transmit/receive solutions while simplifying board layout and cutting cost compared to FPGAs.

The devices feature 48 digital up/down convert channels configurable for data rates as wide as 184MSps with four fractional re-samplers, 48bit NCOs and a bulk upconverter that enables expanded clocking and frequency planning flexibility. Plus, they integrate I/Q imbalance correction for enhanced performance of wideband complex receive and DPD observation signal chains, enabling lower sample rate and lower-cost receive and feedback ADCs.

The GC5330SEK system evaluation and reference design kit provides a complete transceiver reference design for wide bandwidth applications. It includes the following a DAC3283 communications DAC; TRF372017 IQ modulator with integrated PLL/VCO and TRF370417 IQ modulator for diversity transmit;PGA870 programmable-gain amplifier, THS770006 fully-differential op amp and ADS62P49 ADC for diversity receive;PGA870 and ADS41B49 ADC for DPD observation; CDCE72010 clock synthesizer and jitter cleaner for system clocking; and a TMS320C6748 fixed/floating point DSP.

The GC533x family comes in a 23 x 23mm TE-PBGA package. The GC5330, featuring 620MHz of total DPD bandwidth with up to four transmit and eight receive antenna support, is available today for a suggested resale price of $80 in 1,000-unit quantities. The GC5337, offering 740MHz of total DPD bandwidth with up to four transmit and eight receive antenna support, will be available in March for a suggested resale price of $95 in 1,000-unit quantities. The GC5330SEK is available through TI today for $8,500. Software licensing agreement and support fees may apply.

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