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GC1115 Status: ACTIVE

Programmable Wideband Crest Factor Reduction Engine

      
         
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Datasheet

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 GC1115
Number of Channels1 x 20MHz,2 x 10MHz  
Input Rate(Max)(MSPS)130  
Output Rate(Max)(MSPS)250  
No. Peak Detect/Cancel Stages4  
No. Cancel Pulse Generators32  
Output PAR(dB)6  
Cancellation Pulse Lengths(Taps)15 to 509  
Pin/Package256BGA  
Operating Temp Range(Celsius)-40 to 85  
 Samples
 Inventory

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    • Product Information

    Features

    • Reduces Signal Peaks to ≥ 6 dB PAR
    • One- and Two-Channel Operation
    • Programmable PAR With Four Stages
    • Programmable Cancellation Pulse Coefficients
    • 256-Ball PBGA Package, 17-mm × 17-mm
    • 1.2-V Core, 3.3 V I/O
    • APPLICATIONS
      • 3GPP (W-CDMA, HSDPA) Base Stations
      • 3GPP2 (cdma2000) Base Stations
      • TDSCDMA Base Stations
      • PAPR Reduction of OFDM, Wibro, OFDMA Signals
      • Two-Channel Transmit Diversity Applications
      • Operates With TI DAC5687 (500 Msps)

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    All other trademarks are the property of their respective owners.

    Description

    The GC1115 is a flexible, programmable, wideband crest factor reduction (CFR) processor with a maximum composite bandwidth of 32 MHz (4 clocks/complex sample, one channel) or 16 MHz (8 clocks/complex sample, two channels). The GC1115 selectively reduces the peak-to-average ratio (PAR) of wideband digital signals provided in quadrature (I and Q) format. By reducing the PAR of digital signals, the efficiency of follow-on power amplifiers (PAs) is improved, the D/A converter requirements are eased, and the out-of-band spectral regrowth caused by simple hard limiting is eliminated.

    Manufacturers of 3G BTS equipment can realize significant savings on power amplifier costs by including the GC1115. The GC1115 meets multicarrier 3G performance standards (PCDE, composite EVM, and ACLR) at PAR levels down to 6 dB. The GC1115 integrates easily into the transmit signal chain, between a digital upconverter such as the Texas Instruments GC5016 or GC5316 and a high-quality D/A converter, such as the Texas Instruments DAC5687.

    the GC1115 can be interleaved or parallel complex. The GC1115 uses four cascaded stages of peak detection and cancellation (PDC) to remove over-threshold peaks from the input signal. Each PDC stage can be independently programmed with detection target peak levels and cancellation pulse coefficients. A pool of 32 cancellation pulse generators can be flexibly assigned in groups of 4 to any PDC stage. Real or complex FIR cancellation coefficients are preprocessed into coefficients and derivative values. Cancellation pulses are designed to match the user's carrier frequency allocation. Cancellation pulse energy is bandlimited and thus is only added within allocated carrier bands. The GC1115 peak cancellation algorithm has minimal effect on the ACLR of the signal. The CFR data can be interpolated and output in complex or real formats.

    Input sampling rates to 130 Msps are supported, in either parallel or multiplexed I/Q modes, and in either 2s complement or unsigned format. The GC1115 includes an interpolator that increases the output sampling rate by 2× or 4× and optionally modulates the output signal to the fs/4 center frequency. Output sampling rates to 130 Msps are supported in either parallel or multiplexed I/Q modes, and in either 2s complement or unsigned format. A special one-channel, 2× output mode uses both GC1115 output ports to carry odd/even real output samples. Dual on-chip RAM provides either time-domain snapshots or long-term histogramming of the internal peak cancellation signal chain at five user-selected points, enabling real-time monitoring of the CCDF function. A power-level meter monitors either the GC1115 input or output power level.

    		    

    Pricing / Packaging / CAD Design Tools / Samples

    PricePackagingCAD Design ToolsSamples
    DeviceStatusTemp (oC)Price | QuantityPackage | PinsPackage QTY | Package CarrierSymbolsFootprintsSamples
    GC1115IZDJACTIVE-40 to 8543.75 | 1kuBGA (ZDJ) | 256 90 | JEDEC TRAY (10+1) Download CAD Format for this Symbol Download CAD Format for this Footprint

    * Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For higher volume price quotes,prices in local currency or delivery quotes, please contact your local Texas Instruments Sales Office or Authorized Distributor.

    Inventory

      TI Inventory Status Reported Distributor Inventory
    GC1115IZDJAs of 11:29 AM GMT, 03 Jul 2009As of 11:29 AM GMT, 03 Jul 2009
     Lead TimeRegionCompanyIn StockPurchase
     8 Weeks AmericasDigiKey 154
     Rochester Electronics 34
    View all Distributors  

    ** Lead time information is not available at this time. However, our information is updated daily so please check back with us soon. Please contact your preferred TI Authorized Distributor for additional information.

    Quality & Lead (Pb)-Free Data

     Product ContentDPPM / MTBF / FIT Rate
    DeviceEco Plan* Lead / Ball FinishMSL Rating / Peak ReflowDetailsDetails
    GC1115IZDJ RoHS Compliant Green (RoHS & no Sb/Br) SNAGCU Level-3-260C-168 HRViewView

    * The planned eco-friendly classification: Pb-Free (RoHS) or Pb-Free (RoHS Exempt) or Green (RoHS & no Sb/Br) - please click on the Product Content Details "View" link in the table above for the latest availability information and additional product content details.

    If the information you are requesting is not available online at this time, contact one of our Product Information Centers regarding the availability of this information.

    Technical Documents

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    Tools & Software

    NamePart # Company Tool / Software Type
    GC1115 Evaluation DaughterboardGC1115EVMTexas InstrumentsDaughter Cards
    GC1115 System Evaluation KitGC1115SEKTexas InstrumentsDesigner's Kits

    Part # Name Product Family Comments
    DAC5687   16-bit, 500 MSPS 2x-8x Interpolating Dual-Channel Digital-to-Analog Converter (DAC)   DATA CONVERTERS - DIGITAL TO ANALOG CONVERTERS      
    DAC5688   16-bit, 800 MSPS 2x-8x Interpolating Dual-Channel Digital-to-Analog Converter (DAC)   DATA CONVERTERS - DIGITAL TO ANALOG CONVERTERS      
    GC5316   Integrated 24 ch DDC and 24 ch DUC   WIRELESS INFRASTRUCTURE DIGITAL RADIO PRODUCTS - DIGITAL UP AND DOWN CONVERTERS      
    GC5318   High Density Digital Up Converter   WIRELESS INFRASTRUCTURE DIGITAL RADIO PRODUCTS - DIGITAL UP AND DOWN CONVERTERS      
    GC5016   4 channel wideband DDC and/or DUC   WIRELESS INFRASTRUCTURE DIGITAL RADIO PRODUCTS - DIGITAL UP AND DOWN CONVERTERS      
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