3. TECHNICAL BRIEF
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3.27. Power Amplifier Module
The SKY77340 (U404) designed in a compact form factor for quad-band cellular handsets comprising
GSM850/900,DCS1800,PCS1900, supporting GMSK and linear EDGE modulation. The module
consists fo a GSM850/900 PA block and a DCS1800/PCS1900 PA block, impedance-matching
circuitry for 50 ohms input and output impedances, and a Multi-function Power Amplifier Control(MFC)
block. Two separate Heterojunction Bipolar Transistor9HBT) PA blocks are fabricated onto InGaP die.
One supports the GSM850.900 bands, the other supports the DCS1800 and PCS1900 bands. Both
PA blocks share common power supply pins to distribute current. RF input and output ports are
internally matched to 50 ohms to reduce the number of external components.
Table 13 PAM pin description
PIN
Name
Description
1
MODE
GMSK/EDGE Power control mode. L=GMSK, H=EDGE
2
DCS/PCS_IN
RF input(DCS/PCS) DC Blocked
3 BS
Band
Select
4 REVD1
Reserved
5 VBATT
DC
Supply
6 VRAMP
Analog PA Bias Control(All Bands, EDGE Mode)
Analog Output Power Control(All Bands, GMSK Mode)
7
GSM_IN
RF input(EGSM) DC Blocked
9
GSM_OUT
RF Output(EGSM) DC Blocked
10,11 GND
Ground
12 REVD2
Reserved
13,14,15 GND
Ground
16
DCS/PCS_OUT
RF Output(DCS/PCS) DC Blocked
Pad
GND PAD GRID
Ground pad grid is device underside.
Summary of Contents for Prada KE850
Page 1: ...Date March 2007 Issue 1 0 Service Manual Model KE850 Service Manual KE850 ...
Page 3: ... 4 ...
Page 5: ... 6 ...
Page 71: ...4 PCB layout 72 Main PCB bottom Main PCB bottom placement ...
Page 115: ... 116 6 Download S W upgrade 6 Press the START button ...
Page 117: ...6 Download S W upgrade 118 KE850 KE850P40 7 V09a KE850 KE850P40 7 V09a ...
Page 127: ... 128 LGMC 8 pcb layout ...
Page 128: ... 129 LGMC 8 pcb layout ...
Page 129: ... 130 LGMC 8 pcb layout ...
Page 130: ... 131 LGMC 8 pcb layout ...
Page 131: ... 132 8 pcb layout ...
Page 132: ... 133 8 pcb layout ...
Page 133: ... 134 8 pcb layout ...
Page 134: ... 135 8 pcb layout ...
Page 135: ... 136 8 pcb layout ...
Page 136: ... 137 8 pcb layout ...
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Page 172: ...Note ...
Page 173: ...Note ...