3.9 RF Interface
E-GOLDvoice features a fully integrated constant-gain direct conversion receiver, i.e. there is no
interstage filter needed and the baseband level at the analogue IQinterface follows directly the RF
input level. Depending on the baseband ADC dynamic range, single- or multiple-step gain switching
schemes are possible.
An integrated, selfaligning, low-pass filter ensures the receivers to function under blocking and
reference interference conditions and avoids aliasing by baseband sampling. An automatic DC-offset
compensation is implemented and can be switched depending on the gain setting.
3. TECHNICAL BRIEF
- 31 -
Figure 3-9-1. ASM interface
Figure 3-9-2. SAW Filter interface
C417
27p
C418
27p
FL400
5
GND1
GND2
8
GND3
10
GSM1800_1900RX
6
1
GSM1800_1900TX
GSM850_900RX
4
2
GSM850_900TX
9
IN
VC_GSM1800_1900TX
7
3
VC_GSM850_900TX
LMSP2PAA-575TEMP
VC2
VC1
IN CASE OF GSM850/PCS1900
CHANGE THIS DUAL SAW FILTER
PART_NO SFSB0001401
TO PART_NO SFSB0001301
3p
C421
L403
18nH
1
I2
4
9
O1_1
O1_2
8
O2_1
7
6
O2_2
B9308
FL401
2
G1
3
G2
5
G3
10
G4
I1
3p
C419
3p
C422
L404
5.1nH
3p
C420
GSM_RXN
DCS_RXN
GSM_RXP
DCS_RXP
Содержание KG270
Страница 1: ...Date April 2007 Issue 1 0 Service Manual Model KG270 MG160 Service Manual KG270 MG160 ...
Страница 3: ... 4 ...
Страница 81: ...5 DOWNLOAD 82 5 DOWNLOAD 5 1 Download Setup Configure system like figure 5 1 Figure 9 1 Download Setup ...
Страница 87: ... 88 6 BLOCK DIAGRAM 6 BLOCK DIAGRAM ...
Страница 92: ... 93 8 PCB LAYOUT ...
Страница 93: ... 94 8 PCB LAYOUT ...
Страница 104: ... 105 10 CALIBRATION 10 2 3 Click SETTING Memu 10 2 4 Setup Ezlooks menu such as the following fugure KG278 ...
Страница 106: ...10 CALIBRATION 107 10 2 7 Select MODEL 10 2 8 Click START for RF calibration 10 2 9 RF Calibration finish KG278 ...
Страница 107: ...10 CALIBRATION 108 10 2 10 Calibration data will be saved to the following folder ...
Страница 113: ... 114 ...
Страница 124: ...Note ...
Страница 125: ...Note ...