Samsung STH-N271 Service Manual page 68

STH-N271
Circuit Description
2-5. Radio component control
U101 monitors the state of the radio part, and delivers the information to U203. Then, U203 sends the
proper control signals to radio relating regulators and AGCs. The radio interface signals are summarized in
the Table 2-2
Signal Name
PON_LD
TX_RFBAND
VCTCXO_IN
VCTCXO_PC
PLL_DATA
PLL_CLK
PLL_STRB1
RF_BAND
PREAMP_G
RX_BAT
TX_BAT
ANALOG_DIG
LOCK_DET
PLL_ON
A_IF_IN
RX_Q, RX_QN
RX_I, RX_IN
TX_Q, TX_QN
TX_I, TX_IN
MOD
TX_PWR
RSSI
AFC_OUT
AGC_OUT
PA_CNT
DEMOD
TXDA_REF
PON_TX
PON_VRF3
Table 2-2. Radio Interface Signals
Source/Destination
BEC/RFIC
BEC/IF VCO
TCXO/BEC
BEC/TCXO
BEC/RFIC
BEC/RFIC
BEC/RFIC
BEC/Various
BEC/Regulator
BEC/RFIC
BEC/RFIC
BEC/Oscillators
RFIC/BEC
BEC/Regulator
RFIC/IFC
RFIC/IFC
RFIC/IFC
IFC/RFIC
IFC/RFIC
IFC/RFIC
Detector/IFC
RFIC/IFC
IFC/VCTCXO
IFC/RFIC
IFC/RFIC
RFIC/IFC
RFIC/IFC
BEC/Regulator
BEC/Regulator
SAMSUNG Proprietary-Contents may change without notice
Function
Limiter/Discriminator power control
Tx band control (0=PCS, 1=Cell)
14.4 MHz clock
14.4 MHz clock power control
PLL serial data
PLL serial clock
PLL serial strobe
Cell/PCS band select (0=Cell, 1=PCS)
Rx AGC Gain step
Receiver power control
Transmitter power control
Band control (0=Analog, 1=Digital)
PLL lock detect status
PLL power control(V_RF1:RFIC)
IF comparator input
Differential analog receive Q channel
Differential analog receive I channel
Differential analog transmit Q channel
Differential analog transmit I channel
Drive to modulator
Tx power detector
Rx Signal Strength Indicator
Auto Frequency Control voltage
Auto Gain Control voltage
Power Amplifier control voltage
Discriminator output
Tx section common mode DC bias
TX up converter power (V_RF2:RFIC)
Local Amp power(V_RF3:RFIC)
11-8