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Today's Topics:
1. r5717 - trunk/gta02-core/docs/ecn (re...@docs.openmoko.org)
2. r5718 - in trunk/gta02-core: . docs/ecn (re...@docs.openmoko.org)
3. r5719 - in trunk/gta02-core: . docs/ecn (re...@docs.openmoko.org)
--- Begin Message ---
Author: rehar
Date: 2009-11-28 21:12:05 +0100 (Sat, 28 Nov 2009)
New Revision: 5717
Added:
trunk/gta02-core/docs/ecn/ecn0042.txt
Modified:
trunk/gta02-core/docs/ecn/STATUS
trunk/gta02-core/docs/ecn/ecn0019.txt
trunk/gta02-core/docs/ecn/ecn0033.txt
Log:
- added C3017 (1uF) change to ECN0033
- rewrote ECN0019 to reflect Joergs changes, reopened for further discussion
- added ECN0042, switch to symmetrical microphone configuration
Modified: trunk/gta02-core/docs/ecn/STATUS
===================================================================
--- trunk/gta02-core/docs/ecn/STATUS 2009-11-27 23:31:03 UTC (rev 5716)
+++ trunk/gta02-core/docs/ecn/STATUS 2009-11-28 20:12:05 UTC (rev 5717)
@@ -18,7 +18,7 @@
0016 Done Remove upper acceleration sensor (U7801)
0017 Done Move Bluetooth module (U2) to main PCB
0018 Cancel Add beads/filters to audio signals leaving/entering can
-0019 Done Consider applying buzz fix
+0019 Discuss Consider applying buzz fix
0020 Cancel No common mode choke on stereo signals (B4102)
0021 Defer Use EMI-hardened microphone (MC4301)
0022 Done Apply bass fix
@@ -41,6 +41,7 @@
0039 Discuss Insert 0R resistors into SPI signals
0040 Discuss Remove backup battery (BAT1701)
0041 Discuss Test points and 0R resistors for camera interface
+0042 Discuss Changing internal microphone to symmetrical configuration
Open ECNs
@@ -51,6 +52,7 @@
0008 GPS
0010 AUDIO
0011 USB
+0019 AUDIO
0024 GPS
0026 SD-SIM
0027 General
@@ -61,3 +63,5 @@
0039 CPU, LCM
0040 PMU, MODEM
0041 CPU
+0042 AUDIO
+
Modified: trunk/gta02-core/docs/ecn/ecn0019.txt
===================================================================
--- trunk/gta02-core/docs/ecn/ecn0019.txt 2009-11-27 23:31:03 UTC (rev
5716)
+++ trunk/gta02-core/docs/ecn/ecn0019.txt 2009-11-28 20:12:05 UTC (rev
5717)
@@ -4,17 +4,23 @@
RF feeds into the microphone line of the headset jack JK4401. This RF causes
ripples on the microphone bias line of the codec which leads to a poor audio
quality of the microphone.
-One goal of the ECN0018 is to prevent any RF from reaching the wolfson codec,
+One goal of ECN0018 is to prevent any RF from reaching the wolfson codec,
therefore this problem would be solved. However in GTA02-A7 this issue was
-taken care of by adding C4306/C4307 to the microphone lines. Those caps are
-still defined as NC but the footprint(1206) is big enough so that a 100uF cap
-can be easily mounted if necessary. Also R4303 is interchangeable with a 2.2k
-resistor as mentioned in the big-C Buzz Fix [1].
+taken care of by adding C4306/C4307 to the microphone lines [1].
-I'd consider to leave those cap footprints in the circuit if the solution with
-the beads fails and we still get ripple on the mic bias line.
+C4306 in conjunction with R4305(2.2k) acts as a low-pass filter and keeps
+any RF from entering the internal microphone path. It would be a good idea to
+move C4307 before R4305 to protect against RF entering the MICBIAS line at all.
+However to be on the save side we could add a 0R resistor(R4310) in series to
+be able to switch back to the current configuration if necessary.
+I also would consider removing the C4307 footprint completely because it does
not
+participate in a noise cancellation when RF is entering the microphone path
+through MICBIAS.
+Despite the above changes we still leave the C4306 footprint unpopulated. This
+is just a pre-emptive fix if ECN0018 does not archive the expected effect.
+
[1] http://people.openmoko.org/joerg/GSM_EMI_noise/big-C_rework_SOP_rc2.pdf
Modified: trunk/gta02-core/docs/ecn/ecn0033.txt
===================================================================
--- trunk/gta02-core/docs/ecn/ecn0033.txt 2009-11-27 23:31:03 UTC (rev
5716)
+++ trunk/gta02-core/docs/ecn/ecn0033.txt 2009-11-28 20:12:05 UTC (rev
5717)
@@ -11,6 +11,7 @@
- C3007 and C3006 (GSM modem input)
- C3018 and C3011 (GSM modem output)
- C3016 and C4406 (headset MIC)
+- C3017 (ACOP/ACIN coupling)
[1] http://www.wolfsonmicro.com/uploads/documents/en/WM8753.pdf (p. 88)
Added: trunk/gta02-core/docs/ecn/ecn0042.txt
===================================================================
--- trunk/gta02-core/docs/ecn/ecn0042.txt (rev 0)
+++ trunk/gta02-core/docs/ecn/ecn0042.txt 2009-11-28 20:12:05 UTC (rev
5717)
@@ -0,0 +1,16 @@
+Changing internal microphone to symmetrical configuration
+
+According to Joerg, the internal microphone was switched to an asymmetrical
+configuration in GTA02-Rev06. It was expected that this would influence the
+noise (Buzz) dramatically. However a real improvement of the noise could not be
+achieved.
+
+In most cases a symmetrical configuration offers a better common mode noise
+rejection than an asymmetrical one. Therefore it is prefered to operate the
+internal microphone in a symmetrical configuration.
+
+Changes:
+ - replace R4304 with a 2k2 resistor
+
+
+Author Rene Harder <re...@saweb.de>
--- End Message ---
--- Begin Message ---
Author: rehar
Date: 2009-11-28 21:24:15 +0100 (Sat, 28 Nov 2009)
New Revision: 5718
Modified:
trunk/gta02-core/audio.sch
trunk/gta02-core/docs/ecn/STATUS
trunk/gta02-core/docs/ecn/ecn0038.txt
Log:
implemented ECN0038 and moved to done
Modified: trunk/gta02-core/audio.sch
===================================================================
--- trunk/gta02-core/audio.sch 2009-11-28 20:12:05 UTC (rev 5717)
+++ trunk/gta02-core/audio.sch 2009-11-28 20:24:15 UTC (rev 5718)
@@ -1,4 +1,4 @@
-EESchema Schematic File Version 2 date Mon 12 Oct 2009 11:40:06 PM CDT
+EESchema Schematic File Version 2 date Sat 28 Nov 2009 02:20:32 PM CST
LIBS:power,device,conn,gta02-core
EELAYER 24 0
EELAYER END
@@ -13,7 +13,22 @@
Comment3 ""
Comment4 ""
$EndDescr
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Wire Wire Line
+ 13500 4900 13500 5150
+Wire Wire Line
+ 11900 5150 13650 5150
+Connection ~ 13250 5950
+Wire Wire Line
+ 13250 5750 13250 5950
+Connection ~ 14750 5700
+Wire Wire Line
+ 14750 6150 14750 5700
+Wire Wire Line
+ 14850 5400 14850 5450
+Wire Wire Line
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+Wire Wire Line
2650 3750 3600 3750
Connection ~ 1750 2200
Wire Wire Line
@@ -155,38 +170,12 @@
Wire Wire Line
15250 5650 14850 5650
Wire Wire Line
- 13100 5400 13350 5400
+ 14750 6850 14750 6650
Wire Wire Line
- 14850 5950 13350 5950
+ 13850 4250 13500 4250
Wire Wire Line
- 14850 5950 14850 5650
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Wire Wire Line
- 13550 6200 13550 5950
-Wire Wire Line
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-Wire Wire Line
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-Connection ~ 14600 5150
-Wire Wire Line
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-Connection ~ 14050 5150
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-Connection ~ 14050 5950
-Wire Wire Line
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-Wire Wire Line
3450 7100 3150 7100
Wire Wire Line
4550 8050 5200 8050
@@ -503,42 +492,16 @@
Wire Wire Line
4300 7100 4300 7400
Wire Wire Line
- 13350 5950 13350 5700
-Connection ~ 13550 5950
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Wire Wire Line
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-Connection ~ 13800 5950
-Connection ~ 13550 5150
+ 14750 4250 15100 4250
Wire Wire Line
- 13550 4250 13200 4250
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Wire Wire Line
- 13200 4250 13200 4450
+ 13500 4250 13500 4500
Wire Wire Line
- 14050 5150 14050 4900
+ 13500 6850 13500 6600
Wire Wire Line
- 14600 4450 14600 4250
-Wire Wire Line
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-Wire Wire Line
- 14950 4250 14950 4450
-Wire Wire Line
- 14050 4250 14050 4500
-Wire Wire Line
- 14550 5950 14550 6150
-Connection ~ 14550 5950
-Wire Wire Line
- 14050 6850 14050 6600
-Wire Wire Line
- 14050 5950 14050 6200
-Wire Wire Line
- 14850 5150 14850 5450
-Wire Wire Line
- 12300 5700 11900 5700
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-Wire Wire Line
- 13350 5700 13100 5700
-Wire Wire Line
14850 5450 15250 5450
Wire Wire Line
15050 5250 15050 5450
@@ -695,6 +658,29 @@
Connection ~ 1300 2200
Wire Wire Line
2650 3550 2850 3550
+Wire Wire Line
+ 14650 5700 14850 5700
+Wire Wire Line
+ 14850 5700 14850 5650
+Wire Wire Line
+ 14750 4950 14750 5400
+Connection ~ 14750 5400
+Wire Wire Line
+ 13850 5700 13650 5700
+Wire Wire Line
+ 13650 5700 13650 5950
+Wire Wire Line
+ 13650 5950 11900 5950
+Wire Wire Line
+ 13500 6200 13500 5950
+Connection ~ 13500 5950
+Wire Wire Line
+ 13850 5400 13650 5400
+Wire Wire Line
+ 13650 5400 13650 5150
+Wire Wire Line
+ 13250 5350 13250 5150
+Connection ~ 13250 5150
Text GLabel 2650 3550 0 60 Input ~ 0
EP_R
Text GLabel 2650 3750 0 60 Input ~ 0
@@ -1083,67 +1069,58 @@
1 15050 5250
-1 0 0 -1
$EndComp
-Text GLabel 11900 5400 0 60 Input ~ 0
+Text GLabel 11900 5150 0 60 Input ~ 0
SPK_P
-Text GLabel 11900 5700 0 60 Input ~ 0
+Text GLabel 11900 5950 0 60 Input ~ 0
SPK_N
$Comp
-L GND #PWR0199
-U 1 1 4A41B011
-P 13550 6850
-F 0 "#PWR0199" H 13550 6850 30 0001 C CNN
-F 1 "GND" H 13550 6780 30 0001 C CNN
- 1 13550 6850
- -1 0 0 -1
-$EndComp
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L GND #PWR0200
U 1 1 4A41B00D
-P 14050 6850
-F 0 "#PWR0200" H 14050 6850 30 0001 C CNN
-F 1 "GND" H 14050 6780 30 0001 C CNN
- 1 14050 6850
+P 13500 6850
+F 0 "#PWR0200" H 13500 6850 30 0001 C CNN
+F 1 "GND" H 13500 6780 30 0001 C CNN
+ 1 13500 6850
-1 0 0 -1
$EndComp
$Comp
L GND #PWR0201
U 1 1 4A41B008
-P 14550 6850
-F 0 "#PWR0201" H 14550 6850 30 0001 C CNN
-F 1 "GND" H 14550 6780 30 0001 C CNN
- 1 14550 6850
+P 14750 6850
+F 0 "#PWR0201" H 14750 6850 30 0001 C CNN
+F 1 "GND" H 14750 6780 30 0001 C CNN
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$EndComp
$Comp
L GND #PWR0202
U 1 1 4A41AF96
-P 14950 4450
-F 0 "#PWR0202" H 14950 4450 30 0001 C CNN
-F 1 "GND" H 14950 4380 30 0001 C CNN
- 1 14950 4450
+P 15100 4450
+F 0 "#PWR0202" H 15100 4450 30 0001 C CNN
+F 1 "GND" H 15100 4380 30 0001 C CNN
+ 1 15100 4450
-1 0 0 -1
$EndComp
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L VARISTOR D4106
U 1 1 4A41AF7D
-P 14600 4700
-F 0 "D4106" V 14500 4450 60 0000 C CNN
-F 1 "150pF" V 14600 4450 60 0000 C CNN
-F 2 "0402" H 14540 4910 60 0001 C CNN
-F 4 "5.6Vac" V 14700 4450 60 0000 C CNN "AC-Voltage"
- 1 14600 4700
+P 14750 4700
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+F 1 "150pF" V 14750 4450 60 0000 C CNN
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0 -1 1 0
$EndComp
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U 1 1 4A41AF4C
-P 14550 6400
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+F 4 "5.6Vac" V 14850 6150 60 0000 C CNN "AC-Voltage"
+ 1 14750 6400
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$EndComp
$Comp
L CONN_2 SPK4102
@@ -1157,79 +1134,50 @@
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$EndComp
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- 1 13800 5550
+P 13250 5550
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+F 1 "47p" H 13300 5450 50 0000 L CNN
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$EndComp
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$EndComp
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-$EndComp
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U 1 1 4A41ACD2
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-F 1 "EXC24CB102U" H 12700 5200 60 0000 C CNN
-F 2 "EXC24C" H 12640 5960 60 0001 C CNN
- 1 12700 5550
+P 14250 5550
+F 0 "B4105" H 14250 5900 60 0000 C CNN
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$EndComp
Text GLabel 5200 8500 2 60 Input ~ 0
Modified: trunk/gta02-core/docs/ecn/STATUS
===================================================================
--- trunk/gta02-core/docs/ecn/STATUS 2009-11-28 20:12:05 UTC (rev 5717)
+++ trunk/gta02-core/docs/ecn/STATUS 2009-11-28 20:24:15 UTC (rev 5718)
@@ -37,7 +37,7 @@
0035 Done Kill WLAN unused RF components
0036 Done Removal of decoupling capacitor C3020
0037 Done Route ROUT1/LOUT1 back to LINE1/LINE2 input
-0038 Execute Loudspeaker EMI filter
+0038 Done Loudspeaker EMI filter
0039 Discuss Insert 0R resistors into SPI signals
0040 Discuss Remove backup battery (BAT1701)
0041 Discuss Test points and 0R resistors for camera interface
@@ -59,7 +59,6 @@
0030 MODEM
0032 AUDIO
0034 IO
-0038 AUDIO
0039 CPU, LCM
0040 PMU, MODEM
0041 CPU
Modified: trunk/gta02-core/docs/ecn/ecn0038.txt
===================================================================
--- trunk/gta02-core/docs/ecn/ecn0038.txt 2009-11-28 20:12:05 UTC (rev
5717)
+++ trunk/gta02-core/docs/ecn/ecn0038.txt 2009-11-28 20:24:15 UTC (rev
5718)
@@ -16,3 +16,4 @@
Author: Rene Harder <re...@saweb.de>
Review: Werner Almesberger <wer...@openmoko.org>, SVN 5690
+Commit: SVN 5718
--- End Message ---
--- Begin Message ---
Author: rehar
Date: 2009-11-28 21:27:44 +0100 (Sat, 28 Nov 2009)
New Revision: 5719
Modified:
trunk/gta02-core/audio.sch
trunk/gta02-core/docs/ecn/ecn0033.txt
Log:
implemented C3017 (1uF) change
Modified: trunk/gta02-core/audio.sch
===================================================================
--- trunk/gta02-core/audio.sch 2009-11-28 20:24:15 UTC (rev 5718)
+++ trunk/gta02-core/audio.sch 2009-11-28 20:27:44 UTC (rev 5719)
@@ -1,4 +1,4 @@
-EESchema Schematic File Version 2 date Sat 28 Nov 2009 02:20:32 PM CST
+EESchema Schematic File Version 2 date Sat 28 Nov 2009 02:26:03 PM CST
LIBS:power,device,conn,gta02-core
EELAYER 24 0
EELAYER END
@@ -1825,7 +1825,7 @@
U 1 1 4A3EE484
P 3950 4450
F 0 "C3017" V 3850 4250 50 0000 L CNN
-F 1 "100n" V 4000 4600 50 0000 L CNN
+F 1 "1u" V 4000 4600 50 0000 L CNN
F 2 "0402" H 4050 4600 60 0001 C CNN
1 3950 4450
0 1 1 0
Modified: trunk/gta02-core/docs/ecn/ecn0033.txt
===================================================================
--- trunk/gta02-core/docs/ecn/ecn0033.txt 2009-11-28 20:24:15 UTC (rev
5718)
+++ trunk/gta02-core/docs/ecn/ecn0033.txt 2009-11-28 20:27:44 UTC (rev
5719)
@@ -24,3 +24,4 @@
Author: Rene Harder <re...@saweb.de>
Commit: SVN 5589
Review: Werner Almesberger <wer...@openmoko.org>, SVN 5684
+Commit: SVN 5719, added C3017
--- End Message ---
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