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              Technical Description
Ericsson Handheld Telephone 1341-B
Technical Description




2
                                             Technical Description




                   Contents



Design ________________________________________________ 6
Mechanical ______________________________________________ 6
Electronics ______________________________________________ 6
Functional Overview __________________________________ 7
Reception _______________________________________________ 7
Transmission_____________________________________________ 8
Automatic Frequency Control (AFC)__________________________ 8
Low Frequency (Audio) Processing ___________________________ 8
Companding _____________________________________________ 9
Logic ___________________________________________________ 9
Power Supply ___________________________________________ 9
Functional Blocks and Units Description ____________ 10
Frequency Generation_____________________________________ 10
   VCTCXO____________________________________________ 10
   Rx Frequency Synthesizer_______________________________ 10
   Tx Frequency Synthesizer _______________________________ 12
Transmitter _____________________________________________ 12
   Driver Stage__________________________________________ 13
   Control of Output Power ________________________________ 13
Receiver _______________________________________________ 13
   RF-Stage ____________________________________________ 13
   IF Stage _____________________________________________ 13
Power Supply Monitoring _________________________________ 14
Power Supply: Charging __________________________________ 15
Control Logic ___________________________________________ 15
   System Interface ______________________________________ 16
   Processor ____________________________________________ 16
   Display _____________________________________________ 16
   Keyboard ____________________________________________ 16
Audio Processing ________________________________________ 17
   Audio Circuits in Transmission___________________________ 17
   Audio Circuits in Reception _____________________________ 18
ON/OFF-Button _________________________________________ 18

Continued on next page




                                                                  3
Technical Description



              The Major IC Packages ______________________________ 19
              CARL ________________________________________________           19
                 Built-in Microprocessor _______________________________      19
                 Serial Port (in Processor) _______________________________   20
                 ROM ______________________________________________           20
                 RAM ______________________________________________           20
                 Clock Generator _____________________________________        20
                 Modem ____________________________________________           20
                 SAT ______________________________________________           20
                 BAR Generator ______________________________________         21
                 Serial Interface ______________________________________      21
                 IF Counter _________________________________________         21
                 Ports ______________________________________________         21
                 Baud Clock__________________________________________         21
              BERTRAM ____________________________________________            22
                 Serial interface _______________________________________     22
                 ADC ______________________________________________           22
                 Digital inputs _______________________________________       22
                 Digital outputs ______________________________________       23
                 DAC ______________________________________________           23
                 AFC amplifier ______________________________________         23
              LINA _________________________________________________          23
              Duplex Filter ___________________________________________       24
              EPROM _______________________________________________           24
              EEPROM______________________________________________            24
              Interface Block _________________________________________       24




4
                                                     Technical Description




The Ericsson Handheld Telephone 1341-B is a pocket telephone for opera-
tion in the ETACS system.

Special features are:

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