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4-1
4. STH-N375 Block Diagrams
1. Base Band Part Block Diagram
.
MO
D
PL
L
S
y
nt
hes
iz
er
Po
w
e
r
M
ana
gemen
t
PR
EA
MP_
G
Au
x
AD
DR
DA
TA
CNTL
EXT
ME
MO
R
Y
(U
20
6)
KEY
PAD
OS
C
3
01
TCXO
(1
4.
4M
H
z
)
EXT
SYST
EM
RF IF
AG
C_
OUX
RX_
I
RX_
IX
RX_
Q
RX_
Q
X
DEM
O
D
A_
IF
_
I
R
SSI
MO
D
TX
_
I
TX
_
IX
TX
_
Q
TX
_
Q
X
TX
_
P
W
R
PA_
CNT
AF
C
_
OUX
AU
DIO I
F
RE
C2O+
RE
C2O-
MI
C
+
MI
C
-
RA
UX
O
XA
UX
PA_GAT
E
AL
C_EN
RX
_
B
AT
TX
_
B
AT
PLL
_
CLX
PLL
_
D
A
T
A
PLL
_
S
T
R
B
PR
EAM
P
_
G
Digi
tal
Signa
lX
BB
C
L
K
RX_
CLK
RX_
DA
T
A
RX_
S
Y
N
C
TX
_
C
LK
TX
_
D
AT
A
TX
_
S
Y
N
C
RS
T
WBDRX
WBDT
X
SI2
SO
2
SC
K
2
BEC
IF
PAR
T
EX
T
AU
D
IO A
M
P
(U
1
02)
DISP
L
A
Y
GP
IO
s
TC
XO
_I
N
UA
R
T
AUX
rx