Rita » History » Version 5
laforge, 02/19/2016 10:48 PM
1 | 4 | laforge | [[PageOutline]] |
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3 | = TRF6151C = |
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4 | 1 | laforge | This is the Texas Instruments RF Chip TRF6151C |
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6 | It includes a VCO, Mixers, etc. |
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7 | 2 | laforge | |
8 | == TSP == |
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9 | |||
10 | The TSP to the TRF6151 uses three wires: |
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11 | * CLOCK (regular CLK_13M) |
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12 | * STROBE (generated by TPU) |
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13 | * DATA (provided by TPU at falling edge of CLOCK, TRF samples data at rising edge of CLOCK) |
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15 | 3 | laforge | [[Image(Rita:trf6151_tsp.png)]] |
16 | 4 | laforge | |
17 | == Analog I/Q baseband output == |
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19 | During development I've taken some measurements of the I/Q output of the TRF6151. |
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21 | The green and black graph of the diagrams below are the "I" channel positive and negative signal. |
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22 | The magenta graph is the difference signal computed by the Scope. |
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23 | |||
24 | === baseband output in idle mode listening on paging channel === |
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26 | This is zoomed out to a very long timebae to see the Rx activity at 1.8 second intervals, |
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27 | which apparently was the paging channel for the paging group of that IMSI. |
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28 | |||
29 | [[Image(Rita:trf6151_iq_rx_paging_channel.png)]] |
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30 | |||
31 | === multiple consecutive bursts === |
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33 | This shows multiple consecutive received bursts. |
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34 | You can see that there is a DC offset when the TRF6151 is powered up, but you can't really see data on that DC offset |
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35 | |||
36 | [[Image(Rita:trf6151_iq_rx_burst_distance.png)]] |
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37 | |||
38 | === a single burst === |
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39 | |||
40 | [[Image(Rita:trf6151_rx_iq_one_burst.png)]] |
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41 | |||
42 | === bits of a burst === |
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44 | [[Image(Rita:trf6151_rx_iq_bits_of_burst.png)]] |