Hardware » History » Version 6
laforge, 02/19/2016 10:50 PM
1 | 3 | laforge | [[PageOutline]] |
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2 | 1 | laforge | = OsmoSDR Hardware = |
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4 | The OsmoSDR hardware consists of an oscillator, Zero-IF silicon tuner, ADC, FPGA and a USB-capable microcontroller. |
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6 | 5 | laforge | The block schematics looks like this: |
7 | [[Image(osmo_sdr_block.png)]] |
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8 | 1 | laforge | |
9 | == Major Components == |
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10 | |||
11 | === Atmel AT91SAM3U Microcontroller === |
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12 | |||
13 | The SAM3U is a quite powerful but inexpensive Cortex-M3 based Microcontroller. What makes it special compared |
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14 | to many other devices is its integrated USB 2.0 High-Speed device, combined with scatter-gather DMA and an internal |
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15 | memory/bus architecture that can actually drive the USB 2.0 at 480Mbps without any problems. |
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17 | The SAM3U [wiki:Firmware] will be available as Free Software / Open Source in our git repository. |
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19 | 4 | laforge | * Homepage: http://www.atmel.com/sam3u |
20 | * Data Sheet: http://www.atmel.com/dyn/resources/prod_documents/doc6430.pdf |
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22 | 1 | laforge | === Lattice XFP2 FPGA === |
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24 | The FPGA is mainly intended to interface the ADC with the SSC peripheral of the SAM3U. However, it is reasonable |
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25 | to assume it can do some simple filtering, too. |
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27 | The FPGA design will be available as Free Software / Open Source in our git repository |
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28 | |||
29 | === Analog Devices AD7357 ADC === |
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31 | This ADC provides two channels (I and Q) and can run at up to 4.2 Megasamples / second and provides 14 bits of resolution. |
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33 | 4 | laforge | * Homepage: http://www.analog.com/en/analog-to-digital-converters/ad-converters/ad7357/products/product.html |
34 | * Data Sheet: http://www.analog.com/static/imported-files/data_sheets/AD7357.pdf |
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35 | |||
36 | 1 | laforge | === Silicon Tuner === |
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38 | FIXME |
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39 | |||
40 | === !SiLabs Si570 Oscillator === |
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41 | 3 | laforge | |
42 | The Si570 is a 10MHz to 1.4GHz programmable oscillator. The exact frequency can be set and adjusted via an I2C interface. |
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44 | 4 | laforge | * Data Sheet: http://www.silabs.com/Support%20Documents/TechnicalDocs/si570.pdf |
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46 | 1 | laforge | == Status == |
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48 | 4 | laforge | * As of 13 December 2011, we had the first 5 prototypes |
49 | * As of 28 December 2011, we have hardware verification code and detected some bugs that need a 2nd PCB revision |
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50 | 6 | laforge | |
51 | == Options / Extensions == |
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52 | |||
53 | OsmoSDR is prepared for a number of extensions... |
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55 | === GPS locked clock === |
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56 | |||
57 | There is a 1pps input on OsmoSDR. It can be used to slave the OsmoSDR clock to the 1pps output of a GPS receiver in order |
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58 | to achieve high clock accuracy. |
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59 | |||
60 | === Transmitter === |
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61 | |||
62 | OsmoSDR is a pure Rx device. However, there are extension headers of both the SAM3U and the FPGA which permit stacking |
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63 | of a future transmitter board. |
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64 | |||
65 | === Filters === |
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67 | There are jumpers for the differential analog I and Q baseband signals between the mixer/downconverter and the ADC. This can |
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68 | be used to plug custom analog base band filters into the signal chain. |