User's Manual

SRM9000X8 800MHz SERVICE MANUAL
© TMC Radio 2008 page 25 TNM-M-E-0022 Issue 1
Directional
Coupler
RX VCO
Q623
VCO
Buffer
Q631/
Q632
TX/RX Switch
D641/
Q642
TX
Driver
Q531a
TX PA U561
Antenna
Switch
D581/ D582/
D583
Power
Control
Comparator
U551A
Antenna
Filter
L592/
L593/L594
To RX
Mixer
LO1_RX
ADC/DAC/
CODEC U800
TX_MOD
From PLA/DSP
RX/TX
AF
Switch
U801C
Q
I
Switch
U801A
Standard
Microphone
External Accessory
Audio
Current
Sense
U551B
TX Current Sense to
PLA
13V8_UNSW
Audio
Gate
U801B
DATA_EN
TX
Buffer
Amp
Q521
TX/RX AF Control
From PLA
TX_MODE
Internal MIC/ External
Audio Control From
PLA
MOD_SW
CURRENT_SENSE
Antenna
Switch
Control
Q571/572
Power
Control
Detector
D561
Integrator
R308/
C307
PWM TX
Power Set
from PLA
PA_ON
from
PLA
Thermal
Shut Back
R557
TX_PWR
Switch
D683/
D684
Switch
D681/
D682
TX
Buffer
Amp
Q670
TX Mixer
806 - 825 MHz
851 - 870 MHz
TX_LO2
RX_LO
Figure 3-2 Transmitter Block Diagram