Model 7x42-428 (Pentek Inc)
Model 7142-428, Digital Transceiver with Multiband DDC and Interpolation Filter core, is a complete software radio system in a PMC/XMC module. It includes four A/D and one D/A converters capable of bandwidths to 40 MHz and above for connection to HF or IF ports of a communications or radar system. The 7242-428 (6U cPCI), 7342-428 (3U cPCI),7642-428(PCI),7742-428(PCIe) and 7842-428 (x8PCIe) are also available.
*Complete software radio transceiver solution *GateFlow IP Core 428, with four high-performance multiband DDCs and Interpolation Filter, factoryinstalled *Improved dynamic range *Two sets of 18-bit userprogrammable FIR filter coefficients * Decimation range from 2 to 65,536 in steps of 1 *Interpolation range from 2 to 32,768 in steps of 4
A/D and D/A Converter Stages
The front end accepts four full scale
analog HF or IF inputs on front panel MMCX
connectors at +10 dBm into 50 ohms with
transformer coupling into Linear Technology
LTC2255 14-bit 125 MHz A/D converters.
The digital outputs are delivered to the
Virtex-4 FPGA for signal processing or for
routing to other module resources.
A TI DAC5686 digital upconverter (DUC)
and D/A accepts a baseband real or complex
data stream from the FPGA with signal bandwidths
up to 40 MHz.
When operating as an upconverter, it
interpolates and translates real or complex
baseband input signals to any IF center
frequency between DC and 160 MHz. It
delivers real or quadrature (I+Q) analog
output samples at up to 320 MHz to the 16-bit
D/A converter. Analog output is through
a front panel MMCX connector at +4 dBm
into 50 ohms.
If translation is disabled, the DAC5686
acts as an interpolating 16-bit D/A with output
sampling rates up to 500 MHz.
Core 428 Multiband DDCs
The Core 428 downconverter translates
any frequency band within the input bandwidth
range down to zero frequency. The
DDCs consist of two cascaded decimating
FIR filters. Each filter is capable of any decimation
from 2 to 256. The decimations of
the first stage filter and the second stage
filter multiply to yield overall decimation
factors up to 65,536. The second stage FIR
may be bypassed for decimations of 256 or
lower. The decimation of each DDC can be
set independently. After each filter stage is
a post filter gain stage. This gain is primarily
used to compensate for bit growth in
the filter at different decimations but may
also be used to amplify small signals after
out of band signals have been filtered out.
The NCO provides over 108 dB spurious-
free dynamic range (SFDR). The FIR
filter is capable of storing and utilizing two
independent sets of 18-bit coefficients.
These coefficients are user-programmable
using RAM structures within the FPGA.
NCO tuning frequency, decimation and
filter coefficients can be changed dynamically.
Four identical Core 428 DDCs are factory
installed in the 7142 FPGA. An input multiplexer
allows any DDC to independently
select any of the four A/D sources. The
overal decimation range from 2 to 65,536,
programmable in steps of 1, provides output
bandwidths from 50 MHz down to 1.52 kHz
for an A/D sampling rate of 125 MHz and
assuming an 80% filter.
Core 428 Interpolation Filter
The Core 428 interpolation filter increases
the sampling rate of real or complex baseband
signals by a factor of 16 to 2048,
programmable in steps of 4, and relieves
the host processor from performing
upsampling tasks. The interpolation filter
can be used in series with the DUC’s builtin
interpolation, creating a maximum
interpolation factor of 32,768.
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