Text preview for : zap_diagrams.pdf part of Motorola CD920 Service Manual Phone Gsm (Tot. 11 File) - Part 2/2
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MAIN VCO
ANT
RF SWITCH
FL400
Q410 LOW NOISE AMP.
FL461
Q460 MIXER
FL480
GCAP U900
SMOC U500
GIF_SYN_5.2 U220
Q480 ISOLATION AMPLIFIER
SPEAKER
ZAP RECEIVER BLOCK DIAGRAM (GSM)
Motorola Internal Use Only
Aux RF
TX_EN
RX_EN
V2
V1
ANT
AUX
ANTENNA
TX
YES
LOW
HIGH
+3V
-7V
RX
YES
HIGH
LOW
-7V
+3V
TX
U401
V2 VI NO LOW HIGH -7V +3V RX
NO
HIGH
LOW
+3V
-7V
TX
RX AUX RF ZAP T/R SWITCH COMBINATIONS
LOW NOISE AMP SIGNAL FROM RF SWITCH FL400 Q410 FL461 FL461 IF MIXER. Q460
MAIN VCO
RF SWITCH TO RECEIVER FRONT END BLOCK DIAGRAM (GSM)
SIGNALS FROM LNA & VCO.
MIXER SAW FL480
ISOLATE AMP Q480
Q460
TO GIF_SYN RX_EN MUTE = 0V PIN 31 (U220)
BLOCK DIAGRAM OUTPUT OF LNA TO GIF_SYN (GSM).
FROM ISOLATE AMP Q480
LOCAL OSCILLATOR 430 MHz
153 MHz 42 31 43 46 48 RXI RXQ
GIF_SYN (U220) 22 23 SMOC U500
BLOCK DIAGRAM ISOLATE AMP TO SMOC (GSM).
PA BIAS
MAIN VCO
TIC PA RF SWITCH EXCITER Q301 VCO TX U370
PAC U340 SMOC U500 GCAP MIC U900 LOCAL OSCILLATOR GIF_SYN U220
ZAP TX BLOCK DIAGRAM.
45 SMOC U500
26 27 29 28
GIF_SYN_5.2 TXIM &TXQM are reference lines. 60 61 62 63 64 U220
4
TXI &TXQ AFE 330mVpp ridding on 1.38V dc. INPUT FROM GCAP VIA MIC MIC TO GIF_ SYN BLOCK DIAGRAM O/P TO THE TIC TX_EN
pin14 tx vco
rx vco pin1 TX VCO To Exciter stage CHARGE PUMP pin8 cp out PHASE DETECTOR MIXER MAIN VCO
pin23 main cp pin4 U370 TIC IF in lim out pin4 GIF SYN
108Mhz+- 67Khz
26 MAIN VCO 23
GIF_SYN_5.2 U220
27 28 26 29
TXIM TXQM TXI TXQ TO EXCITER
10
6/7
4
LOCAL OSCILLATOR
1
14 TIC
TX VCO
4 8 7
VR354
DM_CS ZAP GIF SYN TO TIC BLOCK DIAGRAM (GSM)
IF FROM GYN_SYN PIN4 MAIN VCO
EXCITER 1 TIC U370 Q331 4
14
TX VCO
8
VR354
LOOP FILTER TX VCO TO EXCITER BLOCK DIAGRAM (GSM)
1.8Ghz max 7v peak max rf in pin2 rf detector
power range 0v=high/float=low det_sw pin11 fb pin5 int pin6
loop activity detection
power range selection
pin7
To exciter
tx_en ov=off 5v=on
pin4 pin10 pin9 act tx_key pin13 sat_byp sat_det pin12 pin8 aoc
PAC IC U340
aoc drive
512K 16 FLASH EEPROM
+
64K 16 SRAM
+
8K 8 EEPROM
+
Memory Data D0-D15 SMoC SPI Interface Address A0-A18 Data D0-D3 Enable/Control 96 32 LCD Display
68338
Control(10)
Keypad
Sim Card
SIM Interface
D8-D15
A0-A4
Reset/ Watchdog
Peripherals
EMMI DHFA Headset LOGIC BLOCK DIAGRAM DSC Bus
BIC 4.1
GCAP Batt+ Thermistor Smart Battery Pack
+
RF SWITCH
FL301
PA Q301
EXCITER Q331
TX VCO
O
7 PAC 12 4 U340 11 9 8 SAT DET DET SW AOC SMOC U500
EXCITER TO POWER AMP BLOCK DIAGRAM
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