The SDR-4000 board is a flexible platform for implementing high performance 'software defined radio' circuitry in a powerful Field Programmable Gate Array (FPGA).

Connected via a high-speed USB 2.0 interface, the entire SDR is implemented in downloadable programmable logic. The SDR-4000 contains a 14-bit A/D converter, sampling at 125MSps. All samples are fed to the SDR FPGA where the radio functions (listed below) are performed. Complete user control via USB endpoints is available for radio and down-converter functions within the FPGA.

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The following radio functions are implemented in the FPGA:

A/D signal strength monitor for automatically controlling VGA Gain.

Two independent Digital Down Converters.

Each DDC contains its own Direct Digital Synthesizer, Complex Mixer, and Programmable Digital Filters.

Beat Frequency Oscillator for Signal Sideband and CW.

Streaming End Point interfaces with FIFOs for Audio, Complex Wide and Narrow band DDC outputs, and A/D samples to the PC.

Snapshot Capture memory.

Digital filters which are loaded from the PC over the USB so their bandwidth and selectivity can be easily changed.

Automatic Gain Control.

Demodulators for AM, Single Sideband and FM.