Digital Receiver Handbook: Basics of Software Radio
Digital Receiver Handbook: Basics of Software Radio
Digital Receiver Handbook: Basics of Software Radio
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<strong>Digital</strong> <strong>Receiver</strong> <strong>Handbook</strong>: <strong>Basics</strong> <strong>of</strong> S<strong>of</strong>tware <strong>Radio</strong>ProductsTransceiver with 256-Channel Narrowband DDC Installed CoreModel 7140-430CH ARF InCH BRF InSampleClock A InClock/SyncBusSampleClock B InRFXFORMRRFXFORMRXTALOSC ACLOCK &SYNCGENERATORXTALOSC BAD6645105 MHz14-bit A/DAD6645105 MHz14-bit A/DADGC4016 DIGITALDOWNCONVERTERABBCMUXCDA/D AA/D BMUXCHANNELIZATIONCHAN 1CHAN 2CHAN 3CHANNELSWITCHMATRIX255CHAN 1022CHAN 1023256CHAN 1024TUNINGCONTROL12COARSE TUNINGFIRCOMPENSATIONFILTERFIRCOMPENSATIONFILTERFIRCOMPENSATIONFILTERFIRCOMPENSATIONFILTERFINE TUNINGDDC1DDC2DDC255DDC256OUTPUTGAINOUTPUTGAINOUTPUTGAINOUTPUTGAINMUXOUT ADDC AOUT BDDC BOUT CDDC COUT DDDC DMUXA/D AFIFOA/D BFIFODDC AFIFODDC BFIFODDC CFIFODDC DFIFOPCI BUS64 bits/66 MHzPCI 2.2INTERFACECH ARF OutCH BRF OutRFXFORMRRFXFORMR16-BIT500 MHzD/ADAC5686DIGITAL16-BIT UPCONVERTER500 MHzD/AXILINX XC2VP50 FPGA WITH GATEFLOW FACTORY INSTALLED CORE 430D/A AFIFOD/A BFIFOFigure 44For applications that require many channels <strong>of</strong>narrowband downconverters, Pentek <strong>of</strong>fers the GateFlowIP Core 430 256-channel digital downconverter bank.Factory installed in the Model 7140 FPGA as shown inFigure 44, Core 430 creates a flexible, very high channelcount receiver system in a small footprint.Unlike classic channelizer methods, the Pentek 430core allows for completely independent programmabletuning <strong>of</strong> each individual channel with 32-bit resolutionas well as filter characteristics comparable to manyconventional ASIC DDCs.Added flexibility comes from programmable globaldecimation settings ranging from 1024 to 8192 in steps<strong>of</strong> 256, and 18-bit user programmable FIR decimatingfilter coefficients for the DDCs. Default DDC filtercoefficient sets are included with the core for all possibledecimation settings.Core 430 utilizes a unique method <strong>of</strong> channelization.It differs from others in that the channel center frequenciesneed not be at fixed intervals, and are independentlyprogrammable to any value.Core 430 DDC comes factory installed in theModel 7140-430. A multiplexer in front <strong>of</strong> the coreallows data to be sourced from either A/D converter Aor B. At the output, a multiplexer allows the 7140 toroute either the output <strong>of</strong> the GC4016 or the Core 430DDC to the PCI Bus.In addition to the DDC outputs, data from bothA/D channels are presented to the PCI Bus at a rateequal to the A/D clock rate divided by any intergervalue between 1 and 4096. A TI DAC5686 digitalupconverter and dual D/A accepts baseband real or complexdata streams from the PCI Bus with signal bandwidths upto 40 MHz.Core 430 is also available for the Models 7240,7340 and 7640.38Pentek, Inc. • One Park Way, Upper Saddle River, NJ 07458 • Tel: (201) 818-5900 • Fax: (201) 818-5904 • Email: digrec@pentek.com • http://www.pentek.com
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