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Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3. TECHNICAL BRIEF
LG Electronics
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LGE Property
3.21 Power Amplifier Module
The TQM7M5005 is an extremely small (5x5x1.1mm3) multi-mode power amplifier module for GSM/EDGE
applications. This module has been optimized for high EDGE efficiency and EDGE power class E2 operation while
maintaining high GSM/GPRS efficiency. In EDGE mode, the Vramp pin provides a continuously variable bias
control to minimize current consumption during backed-off power
conditions.
The module incorporates two highly integrated InGaP power amplifier die with a CMOS controller. The CMOS
controller implements a fully integrated closed-loop power control within the module for GSM Operation. This
eliminates the need for any external couplers, power detectors, current sensing etc., to assure the output power
level. The latter is set directly from the Vramp input from the DAC. The module has Tx enable, band select, mode
(EDGE or GSM) inputs. Module construction is a low-profile over-molded land-grid array on laminate.
.Table 9 PAM pin description
Pin #
Description
Function
1
DCS/PCS in
DCS/PCS RF INPUT – DC blocked
2
MODE SELECT
MODE = High, the PAM operation in EDGE(SPSK) mode
MODE = Low, the PAM operation in GMSK mode.
BAND SELECT (BS)
BAND SELECT = Low, Low-band active
BAND SELECT = High, High-band active
4
VBATT
Battery supply voltage, typ..0 – 4.5 V, nom. 1.6
5
VRAMP
DAC Control signal(analog), Nominal Vramp range is 0.2 to 1.6V
GMSK mode – Controls ramp profile and output power
EDGE mode – Controls ramp profile
6
TX_EN
TX_EN = High, PA is enabled for operation
TX_EN = Low, PA is sleep mode
7
GSM850 / 900 in
GSM850 / GSM900 RF input –- DC blocked
10
GSM850 / 900 out
GSM850 / GSM900 RF output –- DC blocked
12
DCS / PCS out
DCS / PCS RF output –DC blocked
9, 1
Bypass Cap
Connect 0.01uF bypass capacitor as close to pin as practical
8, 11, 14
GND
Ground
Содержание GM360i
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