Samsung SCH-i830 Service Manual page 8

Circuit Description
2-2-2. Transmitter
Antenna(ANT1)
Antenna(ANT1) sends signal to the base station and receives the signal from the base station.
It is a multi-band Antenna and covers PCS band, CDMA band DCS band, GSM Tx band and GPS band.
RF Switch(U1201)
It(U1201) is used to switch the PCS path, the CDMA path the GPS path and the GSM path, The RF
signal pass through PCS path when PCS_SW is high.
PCS_SW, CDMA_SW, GPS_SW and GSM_SW are digital signals from MSM6500 via Decoder(U1200).
Duplexer(F1103)
Duplexer(F1103) allows to transmit only the signals within acceptable Tx
frequency range (1880 ± 30 MHz) through the antenna.
Power Amp(PAM1103)
Power amplifier module(PAM1103:CX77107) amplifies signals to be sent to the base station
through the antenna.
RF Band Pass Filter(Tx RF SAW Filter)
The RF BPF(F1101) pass only specific frequency(1880 ±30MHz) to send it to power
amp(PAM1103:CX77107).
Direct Conversion Transmitter(U1102)
The Direct Conversion Transmitter(U1102: RTR6300) allows the signal to be inputted to the
power amp(PAM1103) as a specified level from I, Q base band signals.
Automatic Gain Control Amp
The TX AGC amp (in RTR6300) controls gain of AGC to deliver power level needed at
driver amp. Its control voltage varies from 0.2V to 2.5V.
2-4
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used with out Samsung's authorization