TI transmit/receive processors for 3G, 4G wireless base stations provide industry’s widest bandwidth digital pre-distortion

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

Key features and benefits

* Provides up to 148 MHz of fifth order corrected DPD bandwidth across two transmitters with CFR 2 dB better than competitive solutions, enabling power amplifier efficiencies as high as 40 percent in three carrier LTE operation with 54-dB adjacent channel leakage ratio (ACLR) and 48-dBm output.
* Delivers 20 dB of ACLR improvement compared to uncorrected signals in wide-bandwidth applications and 40 dB improvement in narrow-bandwidth applications while offering multi-channel, multi-carrier, multi-mode and multi-band support for standards such as 3GPP, MC-GSM, WiMAX, WiBRO and 3GPP2.
* Includes 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 reducing cost by an order of magnitude compared to FPGAs.
* Features 48 digital up/down convert channels configurable for data rates as wide as 184 MS/s with four fractional re-samplers, 48-bit NCOs and a bulk up-converter that enables expanded clocking and frequency planning flexibility.
* Integrates 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 analog-to-digital converters (ADCs).

Tools and support

The GC5330SEK system evaluation and reference design kit provides a complete transceiver reference design for wide bandwidth applications. It includes the following:

* DAC3283 communications DAC (digital-to-analog converter), 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
* TMS320C6748 fixed/floating point DSP