M
ODEL
SL900A V
ERSION
V_1.0
P
REPARED BY
H/W
D
ATE
2006.06.30
S
UBJECT
T
ECHNICAL
M
ANUAL
P
AGE
51/51
SL900A
T
ECHNICAL
M
ANUAL
Most power control systems in GSM sense either forward power or collector/drain current. The
RF3146 does not use a power detector A high-speed control loop is incorporated to regulated the
collector voltage of the amplifier while the stage are held at a constant bias. The Vramp signal is
multiplied by a factor of 2.65 and the collector voltage for the second and third stages are regulated to
the multiplied Vramp voltage. The basic circuit is shown as above.
III. LMSP54HA-348TEMP
(Antenna Switch Module for Tri- Band with SAW Filter)
LMSP54HA-348TEMP is an Antenna Switch Module for GSM900, DCS1800 and PCS1900 of
Murata with Three SAW Modules.
Control Pins (VC1, VC2, VC3) are connected to LB_TX, HB_TX,PCB (signals from baseband
processor). The Control Pins Operating range is 2.4V 2.8V.
Figure 35. The Evaluation board and control logic of LMSP54HA-348TEMP
The GSM900 and DCS1800/PCS1900 input port matching impedances are 50 ohm.
The GSM900, DCS1800 and PCS1900(Balance) output port matching impedance are 150ohm.
Summary of Contents for SL900A
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