Motorola Timeport 280 Service Manual page 53

B C
A
1
ANTENNA SWITCH
J100 N_GSM_EXC_SW
A10
EXT_TEST CONN GSM_EXC_SW
DCS_SW
2
N_DCS_SW
U10
3
4
PA_B+
5
6
7
PA_B+
U550
DCS/PCS IPA
8
9
U400 PAC_275 N_GSM_EXC_EN
PAC IC
PAC_275
10
11
P280 - RF SCHEMATICS
D E F
RECEIVER FRONT END
RF_V2
FL100
TX1
RX_EN N_GSM_SEL
TX2
RX1
RX2
FL101
1805-1880MHz
U100
FL102
Frontend IC
1930-1990MHz
FL103
925-960MHz
RVCO
RF_V2
TRANSMITTER
PA_B+
Q450
B+
DM_CS
Q451
U500
GSM IPA
U300
RX VCO
1342MHz; 1442MHz; 1560MHz
GSM_EXC_EN
SF_OUT
PA_B+
N_GSM_EXC_EN
U1905
Q530
CR545
N_GSM_SEL
N_DCS_SEL
N_GSM_EXC_EN
GSM_EXC_EN
GSM_EXC_EN
Q410
N_GSM_EXC_EN
VCTRL
G H I J
RF_V2
FL104
400MHz
RF_V2
RF_V2
Q151
N_DCS_SEL
PAC_275
RF_V2
RF_V2
N_DCS_SEL
PRE_IN
SW_VCC
CR200
RX Local Osc.
5V
N_GSM_SEL
DCS_SEL
RF_V2
N_DCS_SEL
N_GSM_SEL
RF_V2
N_TXVCO
CPRX
CP_TX
U350
TX VCO
GSM DCS PCS
0 1 1
VCO
1 0 1 BAND
0
1 1
BUFFER
ENABLE
0 0
1
SAT_DET
DET_SW
TX_KEY_OUT
AOC_DRIVE
RX SIGNAL PATH
TX SIGNAL PATH
MAIN VCO SIGNAL PATH
TUNING VOLTAGES
13 MHz REFERENCE CLOCK
DATA BUS
ADDRESS BUS
TEXT REFERENCE SIGNALS
K L
M
Q203
U402
Q202
DCS_SEL DCS_SEL
DCS_SW
RF_V2 EXC_EN
RX_EN
N_TX_EN
N_EXC_EN N_GSM_SEL
Q202
RF_V2 N_DCS_SEL
N_DCS_SW
RX_EN EXC_EN
GSM_EXC_EN
U110
RF_V2
GSM_EXC_SW
Q202 5V
U110
Q204 N_GSM_EXC_EN
Q351
U120
N_RVCO
EXC_EN N_GSM_EXC_SW
PAC_275 N_GSM_SEL
RVCO 5V
N_TXVCO RF_V2 U120
RF_V2
RVCO
GP04 TP201
Q200
GP05 TP202
BFSR
BCLKR
13MHz Osc.
BDR
CR201
RF_V1
RF_V1
5V
MAGIC_13MHz
BCLKX
CLK_SELECT
U201
TX_KEY
MAGIC DM DM_CS
MAGIC_SPI_CS
RF_SPI_CLK
RF_MOSI
BDX
RF_V1
RF_V2
Q201
RF_V2
Vref
V1_FILT
B+
SF_OUT
5V
Y200
26MHz
N