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Número de pieza | RMPA1965 | |
Descripción | CDMA2000-1X and WCDMA PowerEdge Power Amplifier Module | |
Fabricantes | Fairchild Semiconductor | |
Logotipo | ||
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May 2005
RMPA1965
US-PCS CDMA, CDMA2000-1X and WCDMA
PowerEdge™ Power Amplifier Module
Features
■ Single positive-supply operation with low power and shut-
down modes
■ 40% CDMA/WCDMA efficiency at +28 dBm average output
power
■ Compact lead-free compliant low-profile package
(3.0 x 3.0 x 1.0 mm nominal)
■ Internally matched to 50Ω and DC blocked RF input/output
■ Meets CDMA2000-1XRTT/WCDMA performance require-
ments
■ Meets HSDPA performance requirement
General Description
The RMPA1965 power amplifier module (PAM) is designed for
CDMA, CDMA2000-1X, WCDMA and HSDPA personal commu-
nications system (PCS) applications. The 2 stage PAM is inter-
nally matched to 50Ω to minimize the use of external
components and features a low-power mode to reduce standby
current and DC power consumption during peak phone usage.
High power-added efficiency and excellent linearity are
achieved using our InGaP Heterojunction Bipolar Transistor
(HBT) process.
Device
Functional Block Diagram
(Top View)
MMIC
Vcc1 1
RF IN 2
INPUT
MATCH
Vmode 3
DC BIAS CONTROL
Vref 4
8 Vcc2
OUTPUT
MATCH
7 RF OUT
6 GND
5 GND
(paddle ground on package bottom)
©2005 Fairchild Semiconductor Corporation
RMPA1965 Rev. I
1
www.fairchildsemi.com
1 page Efficiency Improvement Applications
In addition to high-power/low-power bias modes, the efficiency of the PA module can be significantly increased at backed-off RF
power levels by dynamically varying the supply voltage (Vcc) applied to the amplifier. Since mobile handsets and power amplifiers fre-
quently operate at 10-20 dB back-off, or more, from maximum rated linear power, battery life is highly dependent on the DC power
consumed at antenna power levels in the range of 0 to +16dBm. The reduced demand on transmitted RF power allows the PA supply
voltage to be reduced for improved efficiency, while still meeting linearity requirements for CDMA modulation with excellent margin.
High-efficiency DC-DC converters are now available to implement switched-voltage operation.
With the PA module in low-power mode (Vmode = +2.0V) at+16dBm output power and supply voltages reduced from 3.4V nominal
down to 1.2V, power-added efficiency is more than doubled from 9.5 percent to nearly 25 percent (Vcc = 1.2V) while maintaining a
typical ACPR1 of –52dBc and ACPR2 of less than –61dBc. Operation at even lower levels of Vcc supply voltage are possible with a
further restriction on the maximum RF output power.
Recommended Operating Conditions
Symbol
f
Vcc1, Vcc2
Vref
Vmode
Pout
Tc
Parameter
Operating Frequency
Supply Voltage
Reference Voltage
(Operating)
(Shutdown)
Bias Control Voltage
(Low-Power)
(High-Power)
Linear Output Power
(High-Power)
(Low-Power)
Case Operating Temperature
Min
1850
3.0
2.7
0
1.8
0
-30
Typ
3.4
2.85
2.0
Max
1910
4.2
3.1
0.5
3.0
0.5
+28
+16
+85
Units
MHz
V
V
V
V
V
dBm
dBm
°C
DC Turn-On Sequence
1) Vcc1 = Vcc2 = 3.4V (typical)
2) Vref = 2.85V (typical)
3) High-Power: Vmode = 0V (Pout > 16 dBm)
Low-Power: Vmode = 2V (Pout < 16 dBm)
RMPA1965 Rev. I
5 www.fairchildsemi.com
5 Page |
Páginas | Total 9 Páginas | |
PDF Descargar | [ Datasheet RMPA1965.PDF ] |
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