The universal SDR platform consists of modular converter cards that can be configured for multi-channel or phased array applications. The cards feature high-speed ADCs and DACs, digital signal processing resources, and programmable cross-connect switches allowing signals to be flexibly routed. This customizable open-source platform is intended as a prototyping tool to develop new SDR applications.

1. Universal SDR Platform
Intentions of the project:
Development of a universal Software Defined Radio (SDR)
hardware platform and operating software for multichannel,
wideband and phased array applications which can be used as
prototyping tool for further applications.
Analog
input
channels
Analog
input
BW
ADC
Input
sample
FIFO
DDC
DIU-202
2
250
MHz
14bit
65MHz
2KW65KW
1
-
2
DRU-204
4
2KW65KW
2KW65KW
-
1
2
14bit
65MHz
14bit
65MHz
14bit
65MHz
-
DCU-204
250
MHz
250
MHz
250
MHz
Different
front-end
configurations
CLK DRV
/2, /4
X2, X4
SCLK
OSC
Output
sample
FIFO
300
MHz
300
MHz
300
MHz
14bit
80MHz
14bit
80MHz
14bit
80MHz
2KW65KW
2KW65KW
2KW65KW
PCI
HOST
Interface
14bit
80MHz
-
16ch
Sampling
CLK
Local
CLK
LCLK
OSC
PCI
BUS
-
300
MHz
Dedicated
data
connection
FPGA
LOGIC and DSP
resource
DUC
2
Config
EEPROM
FPGA CFG
External
TRG in/out
External
CLK in/out
DAC
RS-232
serial control
interface
MCU
Clock
lines
Analog
output
BW
PROM
JTAG
I2C
Front-end
BUS
Analog
output
channel
s
FPGA
JTAG
-
DCU-202
Control
EEPROM
Control
BUS
Technical objectives:
•High-speed, high-bandwidth converters
•Desktop PCI based expansion cards
•Supporting transmit and receive path to
•Sample memory and digital conversion
•Real-time interface to DSP resources
•Analog frequency conversion front-end
Type
The SDR card family is based on feature-reach PCI base board:
DOU-202
4
Cross
Connect
Switch
(CPLD)
Digital
Receive
Processor
(AD6624)
Cross
Connect
Switch
(CPLD)
14-Bit
ADC
(AD6644)
Digital
Receive
Processor
(AD6624)
Cross
Connect
Switch
(CPLD)
RCLK
TRG
Clocking
and
Timing
Digital
Receive
Processor
(AD6624)
Cross
Connect
Switch
(CPLD)
-
16ch
DTU-204
RCh1
-
Digital
Receive
Processor
(AD6624)
Dedicted
Data ports
Local
DSP
and
Data
Routing
Resource
(Xilinx
FPGA)
PCI
Bus
HOST
Interface
(PLX9054)
Config
Control
DRU-204
DCU-204
One of the main feature
of the converter cards is
the programmable
universal cross-connect
switch.
Using these connection
elements the signal can
be routed to form
multidrop multichannel
(up to 16ch/board) or
phased array (up to
4ch/board) receiver or
transmitter board.
DRU-204
RCh1
14-Bit
ADC
(AD6644)
Cross
Connect
Switch
(CPLD)
Digital
Receive
Processor
(AD6624)
RCh2
14-Bit
ADC
(AD6644)
Cross
Connect
Switch
(CPLD)
Digital
Receive
Processor
(AD6624)
14-Bit
ADC
(AD6644)
Cross
Connect
Switch
(CPLD)
Digital
Receive
Processor
(AD6624)
14-Bit
ADC
(AD664)
Cross
Connect
Switch
(CPLD)
Digital
Receive
Processor
(AD6624)
RCh3
RCh4
RCLK
TRG
Clocking
and
Timing
www.sagax .
www.sagax.hu
Dedicted
Data ports
Local
DSP
and
Data
Routing
Resource
(Xilinx
FPGA)
PCI
Bus
HOST
Interface
(PLX9054)
Config
Control
DRU-204
Technology enhancements include:
•Up to 80MHz sampling clock
•270MHz input bandwidth
•Slot card or stand alone operation
•Control trough the PCI or on-board uC
•FPGA firmware booting trough PCI or by uC
•Using master mode PCI interface chip
•Local bus logic implementation in FPGA
•On-board Digital Down Conversion chips
•External connection (link, serial) to DSP
•Multifunctional triggering IO
•Internal or external clocking
Frequency
conversion unit
is implemented
as typical
analog RF
signal
processing
hardware
element
DTU-204
Link port or
serial port can
be used for
real-time data
connection to
the DSP
Typical
integrated
SDR platform
based on
Pentium SBC,
Sharc DSP,
DRU-204
converter
and FCU
Sagax, Ltd.
Sagax, Ltd.
Haller u. 11-13.
1096 Budapest, HUNGARY