H/W Sub System - LG L705ix Service Manual

3. TECHNICAL BRIEF

3.11 H/W Sub System

3.11.1 RF Interface
A. RTR6275(WCDMA_Tx, GSM_Tx/Rx)
MSM6280 controls RF part(RTR6275) using these signals.
• SSBDT_RTR: SSBI I/F signals for control Sub-chipset
• RX_I/Q_M/P,TX_I/Q_M/P: I/Q for T/Rx of RF
• TX_AGC_ADJ: control the gain of the Tx signal prior to the power amplifier
H18
SBST1_GPIO93
H13
TX_AGC_ADJ
L13
TRK_LO_ADJ
F19
TCXO_EN_GPIO94
F17
PA_ON0
A12
Q_OUT_N
B12
Q_OUT
A13
I_OUT_N
B13
I_OUT
F12
DAC_REF
W23
Q_IM_CH1
V23
Q_IP_CH1
V25
I_IM_CH1
W25
I_IP_CH1
AA25
Q_IM_CH0
Y25
Q_IP_CH0
AB25
I_IM_CH0
AC25
I_IP_CH0
D17
GP_PDM2_PA_RAN_GE1
H17
GP_PDM1_PA_RAN_GE0
Figure.3.11.1 Schematic of RF Interface of MSM6280
LGE Internal Use Only
AP_1.2V_EN
TP100
TCXO_EN
(WCMDA 2100PAM Enable)
TX_QM
TX_QP
TX_IM
TX_IP
DAC_REF
RX_QM
RX_QP
RX_IM
RX_IP
PA_R0
- 44 -
R109 2K
PA_ON0 C139
33nF
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
TX_AGC_ADJ
TRK_LO_ADJ
Near to MSM