Transceiver Block Diagram - Ericsson EF738 Service Manual

Transceiver Block Diagram

The transceiver (transmitter/receiver) consist of a digital part that controls and
supervises transmission/reception on the radio channel. It also handles keyboard,
display and protocol transmission to the MTX (Mobile Telephone eXchange). The
audio part controls audio signals for earphone, microphone and modem.
RADIO
TRANSMITTER
FREQ. GENERATOR
MOD. RECEIVER
m o d discr
AUDIO PROCESSING
MICRO/LOUDSPKR
control bus
Figure 3: Transceiver Block Diagram
Technical Description
LOGIC
CPU
MEMORIES
On/Off
KEYPAD
M M I
DISPLAY
ATMS/AFMS
E
X
T
E
R
N
A
L
C
O
N
N
E
C
T
O
R
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