Sharp GX20 Service Manual - Page 94
Egsm 975ch - 4ch 656mhz
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GX20 [RF] BS0 BS1 BS2 RAMPDAC CONFIDENTIAL +B(VRF) IC991 NL27WZ08 IC992 TC7W00FK IC993 NL27WZ08 LOGIC SYNTHEN SYNTHDATA SYNTHCLK 35 39 SERIAL DATA 37 INTERFACE ITXN ITXP QTXN QTXP TCXOOUT +B(VTCXO) 20 21 22 23 36 28,30,31,32,41,46 TCX951 4 AFCDAC 26MHz 1 VCTCXO 3 38 2 LOOP 33 FILTER +B(VRF) 2,13,16,18,47,56 1,3,6,9,12,14,19 29,34,40,45,48,51 I&Q MOD 1/2 90DEG SHIFT1/2 1/2 IF SYNTHESIZER 1/2 IFVCO EGSM 975CH - 4CH 656MHz 5CH - 124CH 640MHz DCS 512CH - 665CH 640MHz 666CH - 885CH 656MHz PCS 512CH - 810CH 640MHz RF IC901 HD155148TF PHASE 1 DETECTOR 1/2 1 RF SYNTHESIZER 4 1/2 1/2 90DEG SHIFT 4 5 11 LNA 1 QRXN QRXP IRXP IRXN 24 PGA PART 25 26 PGA 27 Figure 3 RF BLOCK DIAGRAM (1/2) 4 - 3 90DEG SHIFT 8 LNA 7 90DEG SHIFT 5 LNA 4
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GX20
4 – 3
CONFIDENTIAL
Figure 3
RF BLOCK DIAGRAM (1/2)
[RF]
PGA PART
I&Q
MOD
PHASE
DETECTOR
1/2
90DEG
SHIFT1/2
SERIAL DATA
INTERFACE
1/2
ITXN
ITXP
QTXN
QTXP
IRXP
IRXN
QRXN
QRXP
SYNTHEN
SYNTHDATA
SYNTHCLK
AFCDAC
TCXOOUT
RAMPDAC
BS0
BS1
BS2
RF
IC901
HD155148TF
TCX951
1/2
LOOP
FILTER
90DEG
SHIFT
LNA
LNA
PGA
+B(VRF)
35
39
37
20
21
22
23
36
1
2
3
4
+B(VTCXO)
33
28,30,31,32,41,46
+B(VRF)
2,13,16,18,47,56
1,3,6,9,12,14,19
29,34,40,45,48,51
24
25
26
27
1
1
4
5
4
11
1
8
7
38
IFVCO
EGSM 975CH - 4CH 656MHz
5CH - 124CH 640MHz
DCS
512CH - 665CH 640MHz
666CH - 885CH 656MHz
PCS
512CH - 810CH 640MHz
4
5
IC991 NL27WZ08
IC992 TC7W00FK
IC993 NL27WZ08
1/2
26MHz
VCTCXO
IF SYNTHESIZER
90DEG
SHIFT
RF SYNTHESIZER
LNA
90DEG
SHIFT
LOGIC
1/2
1/2