H/W Sub System - LG GM750 Service Manual

3.12. H/W Sub System

3.12.1. RF Interface
A. RTR6285 (WCDMA_Tx, GSM_Tx/Rx)
MSM7200A controls RF part(RTR6285) using these signals.
SSBDT : SSBI I/F signals for control Sub-chipset
TX_ON : Power AMP on RF part
RX0_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
DAC_REF : Reference
B. the others
TRK_LO_ADJ
PA_ON0/PA_RANGE0
ANT_SEL[0-3]
PCS Tx/Rx)
GSM_PA_RAMP
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
input to the MSM Tx data DACs
: TCXO(19.2M) Control
: WCDMA(2100) TX Power Amp Enable
: Ant Switch Module Mode Selection(WCDMA,GSM Tx/Rx,DCS-
: Power Amp Gain Control of APC_IC
- 57 -
3. Technical Brief
LGE Internal Use Only