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PDF RF3140 Data sheet ( Hoja de datos )
| Número de pieza | RF3140 | |
| Descripción | QUAD-BAND GSM850/GSM900/DCS/PCS PCS | |
| Fabricantes | RF Monolithics | |
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Typical Applications
• 3V Quad-Band GSM Handsets
• Commercial and Consumer Systems
• Portable Battery-Powered Equipment
RF3140
QUAD-BAND GSM850/GSM900/DCS/PCS
POWER AMP MODULE
• GSM850/EGSM900/DCS/PCS Products
• GPRS Class 12 Compatible
• Power StarTM Module
Product Description
The RF3140 is a high-power, high-efficiency power ampli-
fier module with integrated power control. The device is
self-contained 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 out-
put. The device is designed for use as the final RF ampli-
fier in GSM850, EGSM900, DCS and PCS handheld
digital cellular equipment and other applications in the
824MHz to 849MHz, 880MHz to 915MHz, 1710MHz to
1785MHz and 1850MHz to 1910MHz bands. On-board
power control provides over 50dB of control range with an
analog voltage input; and, power down with a logic “low”
for standby operation.
Optimum Technology Matching® Applied
Si BJT
9GaAs HBT
GaAs MESFET
Si Bi-CMOS
9SiGe HBT
Si CMOS
InGaP/HBT
GaN HEMT
SiGe Bi-CMOS
DCS/PCS IN 1
BAND SELECT 2
TX ENABLE 3
VBATT 4
VREG 5
VRAMP 6
GSM850/GSM900 IN 7
12
8
11 DCS/PCS OUT
10 VCC OUT
9 GSM850/GSM900 OUT
Functional Block Diagram
9.600 TYP
8.800 TYP
8.200 TYP
7.400 TYP
6.800 TYP
6.000 TYP
5.400 TYP
4.600 TYP
4.000 TYP
3.200 TYP
2.600 TYP
1.800 TYP
1.200 TYP
0.400 TYP
0.000
Pin 1
8.747
5.925
4.075
1.245
0.306
Pin 1
1.70
1.45
10.00
± 0.10
10.00 ± 0.10
0.450
± 0.075
Package Style: Module (10mmx10mm)
Features
• Complete Power Control Solution
• Single 3.0V to 5.5V Supply Voltage
• +35dBm GSM Output Power at 3.5V
• +33dBm DCS/PCS Output Power at 3.5V
• 60% GSM and 55% DCS/PCS ηEFF
• 10mmx10mm Package Size
Ordering Information
RF3140
RF3140
RF3140 PCBA
Quad-Band GSM850/GSM900/DCS/PCS Power
Amp Module
Power Amp Module 5-Piece Sample Pack
Fully Assembled Evaluation Board
RF Micro Devices, Inc.
7628 Thorndike Road
Greensboro, NC 27409, USA
Tel (336) 664 1233
Fax (336) 664 0454
http://www.rfmd.com
Rev A6 040113
2-491
1 page  
RF3140
Parameter
Specification
Min.
Typ.
Max.
Overall (DCS Mode)
Operating Frequency Range
Maximum Output Power
+32
+29.5
Total Efficiency
Input Power Range
48
0
Output Noise Power
Forward Isolation 1
Forward Isolation 2
Second Harmonic
Third Harmonic
All Other
Non-Harmonic Spurious
Input Impedance
Input VSWR
Output Load VSWR Stability
Output Load VSWR Ruggedness
8:1
10:1
Output Load Impedance
Power Control VRAMP
Power Control Range
Note: VRAMP MAX=3/8*VBATT+0.18<1.5V
1710 to 1785
+33
+31.0
55
+3
-85
-40
-20
-15
-30
50
-
50
50
+5
-80
-30
-10
-7
-15
-36
2.5:1
Unit
MHz
dBm
dBm
%
dBm
dBm
dBm
dBm
dBm
dBm
dBm
Ω
Ω
dB
Condition
Temp=25°C, VBATT=3.5V,
VRAMP=VRAMP MAX, PIN =3dBm,
VREG=2.8V, Freq=1710MHz to 1785MHz,
25% Duty Cycle, pulse width=1154µs
Temp=25°C, VBATT=3.5V,
VRAMP = VRAMP MAX
Temp=+85°C, VBATT=3.0V,
VRAMP=VRAMP MAX
At POUT MAX, VBATT=3.5V
Maximum output power guaranteed at mini-
mum drive level
RBW=100kHz, 1805MHz to 1880MHz,
POUT > 0dBm, VBATT=3.5V
TXEnable=Low, 0V, PIN=+5dBm
TXEnable=High, VRAMP=0.2V, PIN=0dBm
to +5dBm
VRAMP=0.2V to VRAMP MAX
VRAMP=0.2V to VRAMP MAX
VRAMP=0.2V to VRAMP MAX
VRAMP=0.2V to VRAMP MAX
Spurious<-36dBm, RBW=3MHz
Set VRAMP where VRAMP<34.2dBm into
50Ω load
Load impedance presented at RF OUT pin
VRAMP=0.2V to VRAMP MAX, PIN=+5dBm
Rev A6 040113
2-495
5 Page 
Power control loop stability often presents many chal-
lenges to transmitter design. Designing a proper power
control loop involves trade-offs affecting stability, tran-
sient spectrum and burst timing.
In conventional architectures the PA gain (dB/ V) varies
across different power levels, and as a result the loop
bandwidth also varies. With some power amplifiers it is
possible for the PA gain (control slope) to change from
100dB/V to as high as 1000dB/V. The challenge in this
scenario is keeping the loop bandwidth wide enough to
meet the burst mask at low slope regions which often
causes instability at high slope regions.
The RF3140 loop bandwidth is determined by internal
bandwidth and the RF output load and does not
change with respect to power levels. This makes it eas-
ier to maintain loop stability with a high bandwidth loop
since the bias voltage and collector voltage do not vary.
An often overlooked problem in PA control loops is that
a delay not only decreases loop stability it also affects
the burst timing when, for instance the input power
from the VCO decreases (or increases) with respect to
temperature or supply voltage. The burst timing then
appears to shift to the right especially at low power lev-
els. The RF3140 is insensitive to a change in input
power and the burst timing is constant and requires no
software compensation.
Switching transients occur when the up and down
ramp of the burst is not smooth enough or suddenly
changes shape. If the control slope of a PA has an
inflection point within the output power range or if the
slope is simply too steep it is difficult to prevent switch-
ing transients. Controlling the output power by chang-
ing the collector voltage is as earlier described based
on the physical relationship between voltage swing and
output power. Furthermore all stages are kept con-
stantly biased so inflection points are nonexistent.
RF3140
Harmonics are natural products of high efficiency
power amplifier design. An ideal class “E” saturated
power amplifier will produce a perfect square wave.
Looking at the Fourier transform of a square wave
reveals high harmonic content. Although this is com-
mon to all power amplifiers, there are other factors that
contribute to conducted harmonic content as well. With
most power control methods a peak power diode
detector is used to rectify and sense forward power.
Through the rectification process there is additional
squaring of the waveform resulting in higher harmon-
ics. The RF3140 address this by eliminating the need
for the detector diode. Therefore the harmonics coming
out of the PA should represent the maximum power of
the harmonics throughout the transmit chain. This is
based upon proper harmonic termination of the trans-
mit port. The receive port termination on the T/R switch
as well as the harmonic impedance from the switch
itself will have an impact on harmonics. Should a prob-
lem arise, these terminations should be explored.
The RF3140 incorporates many circuits that had previ-
ously been required external to the power amplifier.
The shaded area of the diagram below illustrates those
components and the following table itemizes a compar-
ison between the RF3140 Bill of Materials and a con-
ventional solution:
Component
Power Control ASIC
Directional Coupler
Buffer
Attenuator
Various Passives
Mounting Yield
(other than PA)
Total
Conventional
Solution
$0.80
$0.20
$0.05
$0.05
$0.05
$0.12
$1.27
RF3140
N/A
N/A
N/A
N/A
N/A
N/A
$0.00
Rev A6 040113
2-501
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet RF3140.PDF ] | |
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