LG -P970 Service Manual page 35

Figure shows the schematic of GPS RF path circuit of P970, The CN801has connected GPS antenna, GPS signal is
routed from connector (CN801) and antenna, through a dielectric band pass filter (FL801) and then is amplified
by The GPS LNA module(U802).
The GPS LNA module combines low noise amplifier with filter. The LNA module has RF character, that is 18.2dB
gain and 0.95dB noise figure and rejected spurious signal.
GPS_TCXO_1.8V
GPS_2.8V
C809
2.2u
GPS_UART_RXD
GPS_UART_TXD
GPS_UART_CTS_N
GPS_UART_RTS_N
LGE Internal Use Only
Fig3.8. The Schematic of GPS RF path circuit of P970
G3
AUXOP
A1
CAL_REQ/ANT_SEL
C2
VSSADC
E3
VDD_AUX_O
E5
VDD_AUX_IN
B1
HOST_REQ
B2
LNA_EN
U801
G4
REF_CAP
C6
SCL2/UART_TX
C4
SDA2/UART_RX
B5
UART_nRTS
B3
UART_nCTS
E4
AVSS
D4
VSSC1
D3
VSSC2
C3
VSSC3
1.8V_VIO
C811
2.2u
Fig3.9. The Schematic of GPS main circuit of P970
FB801
C801
2.2u
G1
RFIP
F1
VSSIF
G2
VSSLNA
A5
GPS_CAL
D1
TCXO/TSXO
D5
LPO_IN
D2
ADCP
C1
VDDADC
E1
ADCN
A3
SYNC/PPS_OUT
A2
GPS_GSM_CTL
IFVALID
B6
GPS_RESET_N
RST_N
G6
GPS_PWR_ON
REGPU
E6
TM2
A4
SDA1
C5
SCL1
1.8V_VIO
C812 C813
2.2u 2.2u
- 35 - Copyright © 011 LG Electronics. Inc. All right reserved.
3. TECHNICAL BRIEF
L803 9.1n
C808
1.8p
26MHz_GPS_REF
GPS_26MHz
CLK32K_TWL
Only for training and service purposes