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Circuit Description
6-5 Transmitter Section
POWER AMP MODULE
Power Amp module (U571) amplifier signal to be
sent out to the base station through the antenna.
UP CONVERTER (MIXER)
The up converter (U561) receives the first local
signal to generate 836±12.5 MHz from the signal
controlled by TX AGC amp (U501). 836 ±12.5 MHz
signal comes out from the mixer output by adding
130MHz IF signal to 966±12.5MHz first local signal.
IF AUTOMATIC GAIN CONTROLLER AMP
The signal out to BBA (Base Band Analog) should
be a constant level. The TX IF AGC Amp (U501)
controls power to keep the signal at a constant level.
Dynamic range is 85dB, up gain -40dB, and down
gain -45dB.
6-8
(For AMPS)
ANTENNA
ANT allows signal to send to receive from the base
station.
RF BAND PASS FILTER (BPF)
The RF BPF (F562) accepts only specific frequency
(836±12.5MHz) to send it out to base station
module. The band width is 25MHz.
POWER SUPPLY REGULATOR
The power supply regulator (U751, U130) supply a
regulated power to each part of transmitter. U751
supplies 4.2V to TX driver (U562), mixer (U561) and
TX AGC Amp (U501). U130 supplies 4.8V to power
amp (U571).
Samsung Electronics
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