Samsung Electronics
6-7
6-4 Transmitter Section
(For PCS)
POWER AMP
Power Amp module (U550) amplifier signal to be
sent out to the base station through the antenna.
DRIVER AMP
The driver amp (U522) allows the signal input to
the Power Amp module (U550) to be within a
specified level.
UP CONVERTER (MIXER)
The up converter (U521) receives the first local
signal to generate 1880±30 MHz from the signal
controlled by TX AGC amp (U501). 1880 ±30 MHz
signal comes out from the mixer output by adding
130MHz IF signal to 1750±30MHz first local signal.
The driver ampÕs reference number is U522 and up
converterÕs reference number is U521.
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.
ANTENNA
ANT allows signal to send to receive from the base
station.
RF BAND PASS FILTER (BPF)
The RF BPF (F522, F521) accepts only specific
frequency (1880±30MHz) to send it out to power
and Power Amp module. The band width is
60MHz.
ISOLATOR
Isolator (U542) is used to reduce a reflected signal to
protect the power amp module from being
damaged.
POWER SUPPLY REGULATOR
The power supply regulator (U751, U130) supply a
regulated power to each part of transmitter. U130
supplies 4.8V to Power Amp module (U550). U751
supplies 4.2V to the others.
Circuit Description
Summary of Contents for SCH-1500 series
Page 2: ...Samsung Electronics Co Ltd ELECTRONICS ...
Page 4: ...1 2 Samsung Electronics General Introduction Memo ...
Page 22: ...4 8 Samsung Electronics NAM Programming Memo ...
Page 46: ...Memo 7 4 Samsung Electronics Test Procedure ...
Page 81: ...10 1 DBDM Phone 10 1 1 Main Board PCB REV 2 1 10 PCB Diagrams Top View Bottom View ...
Page 82: ...10 1 2 Memory Board PCB REV 2 0 ...
Page 83: ...10 2 Desk Top Rapid Charger Board PCB ...
Page 84: ...10 3 Travel Charger Board PCB ...
Page 85: ...10 4 Cigarette Lighter Adaptor Board PCB ...
Page 86: ...10 5 Hands Free Kit Board PCB ...
Page 87: ...10 6 Cradle PCB ...
Page 88: ...Memo ...
Page 116: ...12 1 Main Block Diagram ...
Page 117: ...12 2 Desk Top Rapid Charger Block Diagram ...
Page 118: ...12 3 Travel Charger Block Diagram ...
Page 119: ...12 4 Cigarette Lighter Adaptor Block Diagram ...
Page 120: ...12 5 Hands Free Kit Block Diagram ...
Page 121: ...12 6 Logic Circuit Diagram REV 2 1 ...
Page 122: ......
Page 123: ...12 7 Memory Board Circuit Diagram REV 2 0 ...
Page 124: ...12 8 RF Circuit Diagram REV 2 1 ...
Page 125: ...12 9 Desk Top Rapid Charger Circuit Diagram ...
Page 126: ...12 10 Travel Charger Circuit Diagram ...
Page 127: ...12 11 Cigarette Lighter Adaptor Circuit Diagram ...
Page 128: ...12 12 Hands Free Circuit Diagram 12 12 1 Power Supply ...
Page 129: ...12 12 2 Audio Amp ...
Page 130: ...12 12 3 Comm Cont ...
Page 131: ...12 13 Cradle Circuit Diagram ...
Page 132: ...Memo ...