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>Products<strong>Digital</strong> 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 <strong>of</strong>fersthe 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 <strong>of</strong> thePCI bus.A clock/sync bus allows synchronization <strong>of</strong> 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 S<strong>of</strong>tware<strong>Radio</strong> Transceiver, visit pentek.com/sftradcentral.As shown in Figure 43, this module is also availablein a variety <strong>of</strong> form factors including PCI (Model 7640),3U cPCI (Model 7340), 6U cPCI (Model 7240 with twicethe density <strong>of</strong> 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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