kopia lustrzana https://github.com/cariboulabs/cariboulite
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README.md
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README.md
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# cariboulite_sw_fw
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# CaribouLite
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CaribouLite is an affordable, open-source SDR platform that is also a certified HAT for the Raspberry-Pi family of boards (40-pin versions only). It is built for makers, hackers, and researchers and was designed to complement the SDR current eco-systems offering with a scalable, standalone dual-channel software-defined radio.
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<table>
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<tr>
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<td><img src="https://user-images.githubusercontent.com/616259/113452512-ce80d480-940c-11eb-93c7-d980459d7637.png" alt="Top View" height="200"></td>
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</tr>
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<tr>
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<td>Top view</td>
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</tr>
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</table>
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Unlike many other HAT projects, CaribouLite utilizes the <B>SMI</B> (Secondary Memory Interface) present on all the 40-pin RPI versions. This interface is scarcely documented by both Raspberry-Pi documentation and Broadcomm's reference manuals. An amazing work done by https://iosoft.blog/2020/07/16/raspberry-pi-smi/ (code in https://github.com/jbentham/rpi) in hacking this interface contributes to CaribouLite's technical feasibility. The SMI interface should allows exchanging ~500+ Mbit/s between the RPI and the HAT, and yet, the results vary between the different versions of RPI. The results further depends on the specific RPI version's DMA speeds.
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In our application, each ADC sample contains 13 bit (I) and 13 bit (Q), that are streamed with a maximal sample rate of 4 MSPS from the AT86RF215 IC. Such channel requires 4 bytes (samples padded to 32-bit) per sample (and I/Q pair) => 16 MBytes/sec which are 128 MBits/sec. By packing the samples into 24 bit I/Q pair (converting to 12-bit samples by decimating the samples), this required throughput decreases to 96 Mbit/sec. The AT86RF215 IC from Microchip contains two RX I/Q outputs from its ADCs (one for each physical channel - sub-1GHz and 2.4GHz), and a single TX I/Q intput directed to the DACs.
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Deeper project details can be found in our Wiki pages - https://github.com/babelbees/CaribouLite/wiki
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# Specifications
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<B>RF Channels:</B>
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- Sub-1GHz: 389.5-510 MHz / 779-1020 MHz
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- Wide tuning channel: 30 MHz - 6 GHz (excluding 2398.5-2400 MHz and 2483.5-2485 MHz)
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<table>
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<tr>
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<td><img src="https://user-images.githubusercontent.com/616259/113505667-03924180-9549-11eb-8ced-69ead48a2357.png" alt="spectra"></td>
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</tr>
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<tr>
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<td style="text-align:center">Applicable spectra, S1G - sub-1GHz, WB - Wide tuning channel</td>
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</tr>
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</table>
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<B>Note</B>: The gaps are defined by the design constarints of the system and may not exist in real-life hardware.
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<B>FPGA specifications:</B>
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- 160 LABs / CLBs
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- 1280 Logic Elements / Cells
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- 65536 Total RAM bits
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- 67 I/Os, Temp: -40-100 degC
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<B>Applicable RPI models</B>: RPI_1(B+/A+), RPI_2B, RPI_Zero(Zero/W/WH), RPI_3(B/A+/B+), RPI_4B
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<B>Prices @ 2500 units:</B>
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- Total: <$38.5
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- BOM: ~$35
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- PCB: <$1
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- PCBA: <$2.5
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Parameter | Sub-1GHz | Wide Tuning Channel
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---------------------------|------------------------------|------------------------------------------------------------------
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Frequency tuner range | 389.5-510 MHz / 779-1020 MHz | 30 MHz - 6 GHz (excluding 2398.5-2400 MHz and 2483.5-2485 MHz)
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Sample rate (ADC / DAC) | 4 MSPS | 4 MSPS
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Analog bandwidth (Rx / Tx) | <4 MHz | <4 MHz
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Max Transmit power | 14.5 dBm | >14 dBm @ 30-2400 MHz, >13 dBm @ 2400-6000 MHz
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Receive noise figure | <4.5 dB | <4.5 dB @ 30-3500 MHz, <8 dB @ 3500-6000 MHz
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# Board Layout
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<B>Description:</B>
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1. Rasperry-Pi 40-pin connector
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2. A modem - AT86RF215
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3. TCXO - 0.5 ppm @ 26 MHz
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4. FPGA - ICE40LP serier from Lattice Semi.
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5. A frequency mixer with integrated synthysizer - RFFC5072
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6. External reference clock connector (may be used to acheive coherence between many CaribouLite units.
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7. A PMOD connector for FPGA expantion
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8. RPI configuration EEPROM (following RPI-HAT specifications)
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9. RF front-end - switched, amplifiers, and filters.
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10. Reset switch
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11. User custom switch + RPI HAT EEPROM reconfiguration (write-enable) switch
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12. Wide band SMA connector
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13. Sub 1-GHz SMA connector
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