The Digital Radio Kit (DRK) is intended to aid in
the development and test of algorithms and signal processing
applications including:
· Digital radio, modulator/demodulator development
· Software defined radio
· High speed data acquisition and signal processing
· Audio data acquisition and signal processing
The system combines a PCI card, an FPGA signal
processing card, and a down converting digital radio card. All three
cards have connectors allowing them to stack, forming a digital radio
system. The kit will operate in standalone mode or the PCI
card can be attached to a computer.
The standard configuration for the digital radio card is the 75MHz to
150MHz band. The digital radio card is capable of
transmitting and receiving RF signals. Filters, Low Noise Amplifiers,
and mixers are socket-ed to simplify frequency changes. The card
includes a frequency synthesizer LO and mixers for up and down
conversion for transmitting and receiving. The card utilizes
a 13-bit, 210 million samples per second (MSPS) analog-to-digital
converter (ADC), a 14-bit, 400 MSPS digital-to-analog converter (DAC)
and an audio codec.
The acquired signals are sampled and then digitally
processed by the customizable Xilinx Spartan 3, 250,000
gate FPGA card. Users may customize the
FPGA to implement their own algorithms. The FPGA card comes with a JTAG
programming connector and a configuration PROM to retain the FPGA
settings.
The PCI card provides interfaces for the FPGA card
to a computer PCI bus, RS232, and user push buttons.
A Digital Radio
reference FPGA design example and full documentation are included. Features :
Analog
Input Path
Analog
Output Path
Synthesizer
- 600MHz
Synthesizer
- 75MHz to
150MHz VCO(Voltage Controlled Oscillator)
- High
precision, VC-TCXO(Voltage Controlled Temperature Compensated Crystal
Oscillator)
CODEC
- 16bit CODEC
Sampling Frequency 26kHz, Dynamic Range 88dB
- Input - 3.5mm
stereo jack (line level or 3.3V biased electret mic)
- Output - 3.5mm
mono jack (line level)
General
- Externally
powered with 12VDC
- On board
voltage regulators
- Hardware
tune-able antenna filter with an SMA jack
- Filters are
socket-ed for easy frequency changes
- Filter bypass
switches on board
- TX/RX
controlled with a "Push to talk" digital input
- Prototyping
area for user circuits
- Full
documentation with schematic
- Reference FPGA
Digital Radio design for board verification
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