Digital Receiver Handbook: Basics of Software Radio

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Digital Receiver Handbook: Basics of Software RadioProductsDigital Upconverters / DownconvertersModel 7140 PMC/XMC ● Model 7640 PCI ● Model 7240 6U cPCI ● Model 7340 3U cPCIModel 7140PMC/XMCFigure 42The Model 7140 PMC module combines bothtransmit and receive capability with a high-performanceVirtex II-Pro FPGA and supports the emerging VITA42 XMC standard with optional switched fabric interfacesfor high-speed I/O.The front end of the module accepts two +4 dBm fullscaleanalog RF inputs and transformer couples them intotwo 14-bit A/D converters running at 105 MHz. Thedigitized output signals pass to a Virtex-II Pro FPGAfor signal processing or routing to other moduleresources.These resources include a quad digitaldownconverter, a digital upconverter with dual D/Aconverters, 512 MB DDR SDRAM delay memory andthe PCI bus. The FPGA also serves as a control andstatus engine with data and programming interfaces toeach of the on-board resources. Factory-installed FPGAfunctions include data multiplexing, channel selection, datapacking, gating, triggering, and SDRAM memory control.Because the FPGA controls the data flow within themodule as well as providing signal processing, the modulecan be configured for many different functions. Inaddition to acting as a simple transceiver, the modulecan perform user-defined DSP functions on the basebandsignals, developed using Pentek’s GateFlow andReadyFlow ® development tools.The module includes a TI/GC4016 quad digitaldownconverter along with a TI DAC5686 digitalupconverter with dual D/A converters.Each channel in the downconverter can be set with anindependent tuning frequency and bandwidth. ➤36Pentek, 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
Digital Receiver Handbook: Basics of Software RadioProductsDigital Upconverters / DownconvertersModel 7140 PMC/XMC ● Model 7640 PCI ● Model 7240 6U cPCI ● Model 7340 3U cPCIModel 7640PCIModel 73403U PCIModel 72406U cPCIFigure 43➤The upconverter translates a real or complex basebandsignal to any IF center frequency from DC to 160 MHzand can deliver real or complex (I + Q) analog outputsthrough its two 16-bit D/A converters. The digitalupconverter can be bypassed for two interpolated D/Aoutputs with sampling rates to 500 MHz.Inputs to the downconverter can come from manysources, including the input A/D converters, the FPGAsignal processing engines, the SDRAM delay memory,or data sources on the PCI bus. The built-in clock/syncbus supports multiple module synchronization as well asdual on-board oscillators for independent input andoutput clock rates. Furthermore, the Model 7140 offersthe VITA 42 XMC interface. This allows it to transferdata through optional Serial RapidIO, PCI-Express, orother switched fabric interfaces, which provide a highspeedstreaming data path that is independent of thePCI bus.A clock/sync bus allows synchronization of localoscillator phase, frequency switching, decimating filterphase and data collection among multiple 7140s. Oneboard acts as a master, driving clock, sync and gatesignals out to a front panel flat cable bus using LVDSdifferential signaling. The master alone can drive asmany as seven slaves. By using a Pentek Model 9190Clock and Sync Generator to drive the signals, as manyas 80 modules can be configured to operate synchronously.For more information on the Model 7140 SoftwareRadio Transceiver, visit pentek.com/sftradcentral.As shown in Figure 43, this module is also availablein a variety of form factors including PCI (Model 7640),3U cPCI (Model 7340), 6U cPCI (Model 7240 with twicethe density of the other models) and a PMC conductioncooledversion (Model 7140-700). These models are alsoavailable with IP Core 430, a 256-channel narrowbandreceiver, installed, see the next page for more information.37Pentek, 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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Digital Receiver Handbook: Basics of Software Radio

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