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df071c3398
adding an inductor to the clock line. - ecn/INDEX, ecn/ecn0005.txt: new ECN discussing the switch to a capacitative clock voltage divider. With frequency measurements. - atusd/tests/send-20100910: measurement of transceiver performance when placing an inductor in the 16 MHz clock line.
67 lines
1.6 KiB
Plaintext
67 lines
1.6 KiB
Plaintext
Same test setup as for send-20100909. Board 100908-A was modified to have
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a 220 nH inductor in the C7 position, instead of a 0R resistor.
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Distant Local
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--------------- --------------- ---------------
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100813-red 100813-orange 100908-A (with inductor)
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TX 255, -91 255, -85
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TX 255, -90 255, -85
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TX 255, -91 -
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TX 255, -90 255, -85
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TX 255, -91 garbled
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- TX 255, -47
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- TX 255, -47
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- TX 255, -47
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- TX 255, -47
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garbled (-90) TX 255, -47
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255, -82 255, -43 TX
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255, -82 255, -43 TX
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255, -82 255, -43 TX
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255, -82 255, -43 TX
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255, -82 255, -43 TX
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Control experiment:
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100813-red 100813-orange 100908-B (unmodified)
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TX - 255, -83
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TX garbled (-91) 255, -86
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TX - 255, -86
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TX garbled (-91) 255, -86
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TX - 255, -86
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255, -83 255, -43 TX
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255, -84 255, -43 TX
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255, -85 255, -43 TX
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255, -84 255, -43 TX
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255, -84 255, -43 TX
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Summary
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-------
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Direction No inductor (1) With ind. (2) Change
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------------------------------- --------------- ------------ ------
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100813-red -> 100813-orange 255, -87 255, -91 -4 dB
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100813-red -> 100908-A 255, -88 255, -85 +3 dB
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100908-A -> 100813-red 255, -85 255, -82 +3 dB
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100813-red -> 100813-orange 255, -90 - ?
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100813-red -> 100908-B 255, -90 255, -86 +4 dB
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100908-B -> 100813-red 255, -87 255, -84 +3 dB
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(1) Data from send-20100909
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(2) Only 100908-A was modified. Changes in the measurements with
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100908-B show inaccuracies of the test setup.
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Conclusion
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----------
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The differences observed are the same for the modified 100908-A board
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and the unmodified 100908-B board. The inductor therefore does not seem
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to have a significant effect on transceiver performance.
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