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LGE Internal Use Only
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. RF Circuit Technical Brief
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Copyright
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2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
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4.4 GSM Power Amplifier Module
[Figure 4.4-1] Schematic Diagram of 2.5G PAM (TQM7M5005H)
[Table 4.4-1] TQM7M5005H Pin description
10u
C541
100n
C545
10n
C552
47p
C553
10K
R504
VBAT
C550
DNI
C551
1p
L506
3.3n
10p
L505
TQM7M5005
U501
15
7
8
6
11
14
5
9
4
13
3
10
2
12
1
DCS_PCS_IN
DCS_PCS_OUT
MODE_SELECT
GSM850_900_OUT
BS
BY_CAP1
VBATT
BY_CAP2
VRAMP
GND1
GND2
TX_EN
GND3
GSM850_900_IN
PGND
10n
C599
C544
18p
47p
C543
DNI
C549
33n
C548
PA_LEVEL
TXON_PA
PA_MODE
2G_BS
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Copyright
གྷ
2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
snlGpG|Gv G
4.4 GSM Power Amplifier Module
[Figure 4.4-1] Schematic Diagram of 2.5G PAM (TQM7M5005H)
[Table 4.4-1] TQM7M5005H Pin description
Pin #
Description
Function
1
DCS/PCS in
DCS/PCS RF INPUT – DC blocked
2
MODE SELECT
MODE = High, the PAM operation in EDGE(SPSK) mode
MODE = Low, the PAM operation in GMSK mode.
3
BAND SELECT (BS)
BAND SELECT = Low, Low-band active
BAND SELECT = High, High-band active
4
VBATT
Battery supply voltage, typ.3.0 – 4.5 V, nom. 1.6A
5
VRAMP
DAC Control signal(analog), Nominal Vramp range is 0.2 to 1.6V
GMSK mode – Controls ramp profile and output power
EDGE mode – Controls ramp profile
6
TX_EN
TX_EN = High, PA is enabled for operation
TX_EN = Low, PA is sleep mode
7
GSM850 / 900 in
GSM850 / GSM900 RF input –- DC blocked
10
GSM850 / 900 out
GSM850 / GSM900 RF output –- DC blocked
12
DCS / PCS out
DCS / PCS RF output –DC blocked
9,13
Bypass Cap
Connect 0.01uF bypass capacitor as close to pin as practical
8,11,4
GND
Ground
G
Содержание KM555
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