FreeCalypso > hg > fc-rfcal-tools

comparison doc/TI-docs @ 63:131abadbd74d

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doc/Rx-cal-theory written
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 28 May 2017 03:21:34 +0000
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62:a98873b713c3 63:131abadbd74d
1 We don't have a TI calibration document that exactly matches the
2 Calypso+Iota+Rita chipset we are working with, but we do have two different
3 documents from other points in TI history:
4
5 ftp://ftp.freecalypso.org/pub/GSM/Calypso/rf_calibration.pdf
6
7 https://www.freecalypso.org/LoCosto-docs/Production%20test%20and%20calibration/i_sample_rf_test_and_calibration_13_03_04_01991%20-%20v026.pdf
8
9 The rf_calibration.pdf document we found back in 2011 dates from well before
10 our Calypso+Iota+Rita chipset and describes TI's much earlier Sara RF, whereas
11 the LoCosto document naturally deals with TI's LoCosto/I-Sample platform.
12
13 To the best of our understanding of TI history, Sara RF is two generations
14 before our Rita RF (as far as we know, the evolutionary line went from Sara to
15 Clara to Rita), whereas LoCosto (combining the baseband processor and RF
16 in the same chip) was a later development after the Calypso, hence our chipset
17 and the corresponding TCS211 firmware fall right in between the two calibration
18 docs we have.
19
20 The details of the calibration procedures that are correct for our
21 Calypso+Iota+Rita chipset and closely match those that have been performed by
22 Openmoko's factory have been reconstructed by Mychaela Falconia after very
23 careful scrutiny of both Sara and LoCosto calibration documents, combined with
24 detective analysis of calibration artifact files found in Openmoko-made GTA02
25 units; neither the Sara document nor the LoCosto one is particularly instructive
26 by itself, and a *lot* of intelligent filling of the blanks was required.