Motorola 880 Service Manual page 169

DUAL BAND 8800 / 8900 Voltage Supply Block Diagram
from External Devices
EXT_B+
VR901
Q906
Q905
B+
U900 39
GCAP
B+ DC/DC
34
Vswitch DC/DC
Boost Mode Circuitry
SW
35 37
C916
CR910
5.6V
VSWITCH
17
Q221 Q222
18
13
U220
GIFSYN
19 12
RX275
SF_OUT
MDM_ANA_VCC
to RF
to Q100 and to GIFSYN Pin 25, 56
Main VCO
to U805 ( Frequency Doubling )
SW_VCC
to IF Amplifier Q480
6
U101
4
Q222
R991
C105
Filtered -10V
-10V
to U104, Q304
DP -10V
REVISIONS
Europe Middle East & Africa Customer Services
Voltage Supply Block Diagram
DUAL BAND 8800 / 8900
Colin Jack, Michael Hansen, Billy Jenkins
from Battery
BATT+
B+
Q999
CR998
RF
AL
RF
AL
REF
22
11 41
3
VRef
to GIFSYN
R475 L275
to AL
to GIFSYN,
Q503, Q504, Q350
L500
to U703, U802 and Logic Signals
05.04.98
Rev. 1.0
Page 1
B+
28
Q100
Q1000
R275
MIX_R275
to MIXER
to RF
Q460
SW_RX_275
to GSM_DCS Matrix
Q115
B+
Q301
Q113 Q114
DCS_RX_275
to DCS LNA
Q430
GSM_RX_275 PA_B+
to GSM LNA
Q410