FreeCalypso > hg > fc-rfcal-tools
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doc/Rx-cal-theory: typo fix
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sun, 28 May 2017 05:10:32 +0000 |
parents | 131abadbd74d |
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We don't have a TI calibration document that exactly matches the Calypso+Iota+Rita chipset we are working with, but we do have two different documents from other points in TI history: ftp://ftp.freecalypso.org/pub/GSM/Calypso/rf_calibration.pdf https://www.freecalypso.org/LoCosto-docs/Production%20test%20and%20calibration/i_sample_rf_test_and_calibration_13_03_04_01991%20-%20v026.pdf The rf_calibration.pdf document we found back in 2011 dates from well before our Calypso+Iota+Rita chipset and describes TI's much earlier Sara RF, whereas the LoCosto document naturally deals with TI's LoCosto/I-Sample platform. To the best of our understanding of TI history, Sara RF is two generations before our Rita RF (as far as we know, the evolutionary line went from Sara to Clara to Rita), whereas LoCosto (combining the baseband processor and RF in the same chip) was a later development after the Calypso, hence our chipset and the corresponding TCS211 firmware fall right in between the two calibration docs we have. The details of the calibration procedures that are correct for our Calypso+Iota+Rita chipset and closely match those that have been performed by Openmoko's factory have been reconstructed by Mychaela Falconia after very careful scrutiny of both Sara and LoCosto calibration documents, combined with detective analysis of calibration artifact files found in Openmoko-made GTA02 units; neither the Sara document nor the LoCosto one is particularly instructive by itself, and a *lot* of intelligent filling of the blanks was required.