The SRXL2 mezannine board provides software defined radio in a PCI or PCI Express platform. The board is designed to mount on the EDT PCI GS or PCIe8 LX main board, and accepts simultaneous RF inputs in the L-Band range of 800-2400 MHz and the IFs of 70, 140, or 160 MHz. The IF input also has a selectable direct sampling path. Each RF input is processed with an analog mixer. The mixer outputs are bandpass-filtered and digitized with 12-bit precision at a fixed sample rate of 250 MHz.
The resulting two channels of digital sample data are available as inputs to the Xilinx Virtex 4 FPGA. The Virtex 4 is user-programmable to perform signal processing or serve as a configurable switch matrix to route data to the main board and up to four four-channel GC4016 digital down-converter Graychips.
Additional user-configurable processing can be performed on the PCI GS or PCIe8 LX main board user interface FPGA. The GS main board provides a flexible high-performance 32-bit 66 MHz PCI DMA interface to the host computer memory and applications. The LX main board provides an 8-bit PCI Express interface.
The SRXL2 is similar to the SRXL with the following differences:
- Supported by the PCI GS and PCIe8 LX main boards but not the PCI SS
- Sampling the RF inputs at a higher sampling frequency (250 MHz instead of 65)
- Higher sampling frequency allows digitization of larger chunk of bandwidth
- Much larger FPGA, better suited towards DSP applications
- 8 more channels of digital down-conversion
- Provides GPS time code input for time-stamping data