GC5328 Datasheet, PDF (1/27 Pages) Texas Instruments – GC5328 Low-Power Wideband Digital Predistortion Transmit Processor

GC5328
www.ti.com
SLWS218A – OCTOBER 2009 – REVISED OCTOBER 2009
GC5328 Low-Power Wideband Digital Predistortion Transmit Processor
Check for Samples: GC5328
FEATURES
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• Integrated DUC, CFR, and DPD Solution
• 20-MHz Max. Signal Bandwidth, Based on Max.
DPD Clock of 200 Mhz, Fifth-Order Correction
• DUC: Up to 12 CDMA2000/TDSCDMA, 4
W-CDMA, 2–10 MHz or 1–20 MHz OFDMA
Carriers
• CFR: Typically Meets 3GPP TS 25.141 < 6.5 dB
PAR, < 8.5 dB PAR for OFDMA Signals
• DPD: Short-Term Memory Compensation,
Typical ACLR Improvement > 20 dB
• GC5328IZER PBGA Package, 23 mm × 23 mm
• 1.2-V Core, 1.8-V HSTL, 3.3-V I/O
• 2.5-W Typical Power Consumption
• TMS320C6727 DPD Optimization Software
• Supports Direct Interface to TI High-Speed
Data Converters
APPLICATIONS
• 3 GPP (W-CDMA) Base Stations
• 3 GPP2 (CDMA2000) Base Stations
• WiMAX, WiBRO, and LTE (OFDMA) Base
Stations
• Multicarrier Power Amplifiers (MCPAs)
BB Data
GC5328
DAC
I/Q
DAC
DUC-CFR-DPD
ADC
I/Q
Modulator
LO
Mixer
Attenuator
0–31.5 dB
HPA
LPA
Attenuator
0–31.5 dB
Host
Control
Interface
'C6727
DSP
Figure 1. GC5328 System Block Diagram
B0278-03
DESCRIPTION
The GC5328 is a lower-power version of the GC5322 wideband digital predistortion transmit processor. The
GC5328 includes a digital upconverter (DUC) block, a crest factor reduction (CFR) block, a digital predistortion
(DPD) block, feedback (FB) block, and capture buffer (CB) blocks.
The GC5328 GPP block receives the interleaved IQ data from the baseband input. The individual IQ channels
are gain-adjusted in the GPP and routed to the DUC. The GPP and DUC can be bypassed to input a combined
IQ signal. The DUC provides three stages of interpolation and a complex mixer. There are two DUC blocks. The
output from the DUC blocks is combined in the sum chain. Each of the 1 to 12 DUC channels can be summed,
and the composite signal can be scaled.
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2009, Texas Instruments Incorporated