Model 7131 (147)
Model 7131 is a general-purpose 16-channel multiband digital receiver PMC module which attaches directly to PMCcompatible baseboards. It includes both a Virtex-II FPGA and two 14-bit A/Ds for signal processing.
*Two 80 or 105 MHz, 14-bit A/D converters * 16 channels of multiband digital downconverters *5 kHz to 10 MHz output bandwidth for ƒS = 100 MHz *250 MHz input bandwidth * Ideal for IF sampling *User-configurable Xilinx Virtex-II FPGA *Custom FPGA I/O through the P4 PMC connector *Bypass path allows direct capture of A/D data *Front panel clock and sync bus *Synchronization of up to 80 modules (with Model 9190) *Ruggedized version available: 7131-702
The Model 7131 accepts two analog RF
inputs at +4 dBm full scale into 50 ohms on
front panel SMA connectors.
The two inputs are transformer coupled
and digitized by AD6645 14-bit A/D converters.
The AD6645 operates at a maximum
sampling rate of 80 MHz in the standard unit
and up to 105 MHz for option -100.
The sampling clock can be driven from
an internal 80 MHz or 100 MHz crystal
oscillator, or from an external sample clock
supplied through a front panel SMA connector
or the front panel sync bus.
The 7131 includes four TI/Graychip
GC4016 quad multiband digital downconverter
chips. The maximum input sampling
rate for the GC4016 is 100 MHz. Each
device includes four independently tunable
channels capable of center frequency tuning
from DC to ƒS/2, where ƒS is the sample
Each GC4016 accepts two 14-bit parallel
inputs from the two A/D converters. A crossbar
switch in each GC4016 allows all 16
channels on the board to select either of the
two A/D inputs for flexible switching.
With a 100 MHz sample clock, the
useable output bandwidth of each of the
downconverter channels is 2.5 MHz. However,
since the Model 7131 delivers parallel
digital outputs from the GC4016 into the
FPGA, users can take advantage of the
GC4016 channel combining mode to join
two or four channels into a single channel
with a resulting bandwidth of 5 or 10 MHz,
respectively. This supports many of the
new wideband wireless standards.
Since both A/D converters connect
directly to the FPGAs, signals with even
wider bandwidths can be accommodated.
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