Pentek Debuts Dual Digital Transceiver with DDC Core, Interpolation Filter

Pentek, Inc., one of the pioneers of VME board-level technology, released its Model 7140-420 Dual Digital Transceiver with Wideband Digital Downconverter (DDC) Core and Interpolation Filter. This is a complete software radio system in a PMC/XMC module. It includes two A/D and two D/A converters for connection to HF and IF ports. This highly versatile transceiver, with greatly extended bandwidth, can fulfill an unusually wide range of applications in signal intelligence, military and commercial communications systems and in radar. This module is also available in a variety of form factors including PCI, 3U and 6U cPCI, as well as a PMC/XMC conduction-cooled version.

“We expanded the capability of the basic hardware ASICs on the board with the GateFlow FPGA IP Core 420, which adds high-performance wideband DDCs and an interpolation filter. This enhanced product is far more powerful than the original, operating over a wider range of bandwidths – at both the input and the output,” says Rodger Hosking, vice president, Pentek. “Pentek is proud of this industry-first installation of IP cores in an off-the-shelf module to extend the original decimation and interpolation by more than three orders of magnitude,” he added.

A Single Product Performs Multiple Roles
The Model 7140-420 Dual Digital Transceiver with Wideband DDC Core and Interpolation Filter handles a range of input and output signal bandwidths from 4.8 kHz to 40 MHz – highly extraordinary for a single product. Customers benefit from the economy of scale realized by purchasing one product to fulfill all their required functionalities.

“For example, a signal-intelligence customer may acquire a voice band signal with an 8-kHz bandwidth one day, and the next day the same customer might want to acquire a cell phone signal 10 MHz wide,” says Hosking. “By choosing the Model 7140-420, this customer can employ a single product to address multiple applications spanning a huge range of bandwidth requirements.”

Down-Converting Enhanced by an IP-Based DDC
The GateFlow Core 420 includes a two-channel, wideband DDC IP core that complements the multiband Texas Instruments GC4016 ASIC. This DDC can be driven directly from the A/D converters to achieve decimations from 2 to 64 for signal bandwidths up to 40 MHz.

Alternatively, the GateFlow Core 420 DDC can be driven from the outputs of the Texas Instruments GC4016 ASIC DDC using a cascade connection. This provides a maximum decimation of 1,048,576 to handle extremely low bandwidth signals down to 76 Hz.
Thus, the GateFlow Core 420 DDC significantly extends both the upper and lower bandwidth limits of GC4016 ASIC alone.

Core-based Interpolator Improves Upconverting Performance
On the upconverter side, an IP core interpolation filter boosts the sampling rate of real or complex signals by a factor of 16 to 1024, programmable in steps of 2. Acting as a pre-processing stage for the Texas Instruments DAC5686 DUC (digital up converter), the core extends the overall interpolation range for the module so it is now programmable from 2 to 16,384.

Consequently, with a 100 MHz output sample rate, the module now accepts baseband transmit signal bandwidths that can range from 40 MHz down to about 4.8 kHz.

Software Support
Pentek’s ReadyFlow Board Support Libraries and C-callable device functions simplify board operation and setup with easy-to-use function calls. ReadyFlow libraries offer flexibility and provide low-level access to all of the board’s hardware.

Pentek support libraries, device drivers and software development tools, plus third-party offerings, are all available for a variety of platforms, including PCs running Windows 2000/XP or Linux operating systems and PowerPCs running VxWorks, Linux or eCos operating systems.

All these software resources allow full control of all new features of the GateFlow Core 420, including configuration of the data flow into and out of the new IP cores and full access to operating parameters like interpolation and decimation factors, filter coefficients, data formatting, and modes of operation.

Pricing and Availability
The Model 7140-420 PMC/XMC module’s prices start at $11,995 USD for the PMC version, with delivery 8 to 10 weeks ARO.

About Pentek
Pentek develops, manufactures and markets innovative DSP systems to original equipment manufacturers, distributors and value-added resellers. Pentek offers powerful VME, VXS, PMC, XMC, cPCI and PCI boards for data acquisition, software radio and digital signal processing featuring Texas Instruments C6000 DSPs, Freescale G4 PowerPCs and Xilinx FPGAs. Pentek’s I/O includes A/Ds, D/As, FPGAs, digital up/downconverters and more. Pentek equips all products with high-performance I/O including Gigabit serial interfaces and offers strong DSP software support.

Pentek, GateFlow, SystemFlow and RTS are trademarks or registered trademarks of Pentek, Inc.

North American Sales Contact: Mario Schiavone, Pentek, Inc., One Park Way, Upper Saddle River, NJ 07458-2311; Telephone 201-818-5900, ext. 770; Fax 201-818-5904; Email

International Sales Contacts: Elexo in France 0141 22 1000, VSystems Electronic GmbH in Germany at 892737630, VSystems s.r.l. in Italy at 119661319, VSystems AB in Sweden at 84441550, VSystems UK at 1494476000, Sela Electronic Systems in Israel at 36479969 and MISH International in Japan at 425387650, Beijing BetaOne Sysjob Ltd. in China at 1082784106 and Acetronix Co. Ltd. in Korea at 24202343.