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PDF RF3146D Data sheet ( Hoja de datos )

Número de pieza RF3146D
Descripción DUAL-BAND GSM900/DCS POWER AMP MODULE
Fabricantes RF Micro Devices 
Logotipo RF Micro Devices Logotipo



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Typical Applications
• 3V Dual-Band GSM Handsets
• Commercial and Consumer Systems
• Portable Battery-Powered Equipment
RF3146D
DUAL-BAND GSM900/DCS
POWER AMP MODULE
• EGSM900/DCS Products
• GPRS Class 12 Compatible
• Power StarTM Module
Product Description
The RF3146 is a high-power, high-efficiency power ampli-
fier module with integrated power control. The device is a
self-contained 7mmx7mmx0.9mm lead frame module
(LFM) with 50Ω input and output terminals. The power
control function is also incorporated, eliminating the need
for directional couplers, detector diodes, power control
ASICs and other power control circuitry; this allows the
module to be driven directly from the DAC output. The
device is designed for use as the final RF amplifier in
EGSM900 and DCS handheld digital cellular equipment
and other applications in the 880MHz to 915MHz and
1710MHz to 1785MHz bands. On-board power control
provides over 50dB of control range with an analog volt-
age input; and, power down with a logic “low” for standby
operation.
0.10 C A
-A-
7.00 TYP
2 PLCS
6.75 TYP
0.10 C B
2 PLCS
0.08 C
0.70
0.65
0.90
0.85
0.05
0.00
2 PLCS
0.10 C B
2 PLCS
0.10 C A
-B-
3.37 TYP
3.50 TYP
SEATING
-C- PLANE
Dimensions in mm.
0.10M C A B
00..6204TYP
0.30
0.18
0.50
00..6204TYP
Shaded lead is pin 1.
0.30
2.20
1.90
0.50
0.30
TYP
5.25
4.95
Optimum Technology Matching® Applied
Si BJT
9GaAs HBT
GaAs MESFET
Si Bi-CMOS
9SiGe HBT
Si CMOS
InGaP/HBT
GaN HEMT
SiGe Bi-CMOS
3146
DCS IN 37
BAND SELECT 40
TX ENABLE 41
VBATT 42
VBATT 43
Fully Integrated
Power Control Circuit
VRAMP 45
GSM IN 48
31 DCS OUT
6 GSM OUT
Package Style: LFM, 48-Pin, 7mm x7mmx0.9mm
Features
• Integrated VREG
• Complete Power Control Solution
• +35dBm GSM Output Power at 3.5V
• +33dBm DCS Output Power at 3.5V
• 60% GSM and 55% DCSEFF
• 7mmx7mmx0.9mm Package Size
Ordering Information
RF3146D
RF3146D SB
RF3146DPCBA-41X
Dual-Band GSM900/DCS Power Amp Module
Power Amp Module 5-Piece Sample Pack
Fully Assembled Evaluation Board
Functional Block Diagram
RF Micro Devices, Inc.
7628 Thorndike Road
Greensboro, NC 27409, USA
Tel (336) 664 1233
Fax (336) 664 0454
http://www.rfmd.com
Rev A11 060719
2-491

1 page




RF3146D pdf
RF3146D
Pin Function Description
Interface Schematic
1 NC Internal circuit node. Do not externally connect.
2 VCC2 GSM Controlled voltage input to the GSM driver stage. This voltage is part of
the power control function for the module. This node must be con-
nected to VCC OUT. This pin should be externally decoupled.
VCC2
3 NC Internal circuit node. Do not externally connect.
4
GND
Internally connected to the package base.
5
GND
Internally connected to the package base.
6 GSM900 RF output for the GSM band. This is a 50Ω output. The output match-
OUT
ing circuit and DC-block are internal to the package.
VCC3
Output
Match
RF OUT
7
GND
Internally connected to the package base.
8 NC Internal circuit node. Do not externally connect.
9 NC Internal circuit node. Do not externally connect.
10 NC Internal circuit node. Do not externally connect.
11 NC Internal circuit node. Do not externally connect.
12 NC Internal circuit node. Do not externally connect.
13 NC No internal or external connection.
14 NC Internal circuit node. Do not externally connect.
15 NC Internal circuit node. Do not externally connect.
16 NC Internal circuit node. Do not externally connect.
17 NC Internal circuit node. Do not externally connect.
18 VCC3 GSM Controlled voltage input to the GSM output stage. This voltage is part of
the power control function for the module. This node must be con-
nected to VCC OUT. This pin should be externally decoupled.
VCC3
19 VCC OUT Controlled voltage output to feed VCC2 and VCC3. This voltage is part
of the power control function for the module. It cannot be connected to
any pins other than VCC2 and VCC3.
20 VCC OUT Controlled voltage output to feed VCC2 and VCC3. This voltage is part
of the power control function for the module. It cannot be connected to
any pins other than VCC2 and VCC3.
21 VCC3 DCS Controlled voltage input to the DCS output stage. This voltage is part of See pin 18.
the power control function for the module. This node must be con-
nected to VCC OUT. This pin should be externally decoupled.
22 NC Internal circuit node. Do not externally connect.
23 NC Internal circuit node. Do not externally connect.
24 NC No internal or external connection.
25 NC Internal circuit node. Do not externally connect.
26 NC Internal circuit node. Do not externally connect.
27 NC Internal circuit node. Do not externally connect.
28 NC Internal circuit node. Do not externally connect.
29 NC Internal circuit node. Do not externally connect.
30
GND
Internally connected to the package base.
Rev A11 060719
2-495

5 Page





RF3146D arduino
RF3146D
Theory of Operation
Overview
The RF3146 is a dual-band EGSM900 and DCS1800 power amplifier module that incorporates an indirect closed loop
method of power control. This simplifies the phone design by eliminating the need for the complicated control loop
design. The indirect closed loop appears as an open loop to the user and can be driven directly from the DAC output in
the baseband circuit.
Theory of Operation
The indirect closed loop is essentially a closed loop method of power control that is invisible to the user. Most power con-
trol 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 regulate the collector voltage of the amplifier while the stage are held at a con-
stant 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 in the following diagram.
TX ENABLE
VRAMP
VBATT
H(s)
RF IN
RF OUT
TX ENABLE
By regulating the power, the stages are held in saturation across all power levels. As the required output power is
decreased from full power down to 0dBm, the collector voltage is also decreased. This regulation of output power is
demonstrated in Equation 1 where the relationship between collector voltage and output power is shown. Although load
impedance affects output power, supply fluctuations are the dominate mode of power variations. With the RF3146 regu-
lating collector voltage, the dominant mode of power fluctuations is eliminated.
PdBm
=
10 log
-(--2-------V----C----C----–-----V----S---A---T---)--2-
8 RLOAD 10–3
(Eq. 1)
There are several key factors to consider in the implementation of a transmitter solution for a mobile phone. Some of
them are:
• Current draw and system efficiency
• Power variation due to Supply Voltage
• Power variation due to frequency
• Power variation due to temperature
• Input impedance variation
• Noise power
• Loop stability
• Loop bandwidth variations across power levels
• Burst timing and transient spectrum trade offs
• Harmonics
Rev A11 060719
2-501

11 Page







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