RMPA2271 데이터 시트보기 (PDF) - Fairchild Semiconductor
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RMPA2271
Fairchild Semiconductor
RMPA2271 Datasheet PDF : 9 Pages
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PRELIMINARY
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 WCDMA 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 ACLR1 of –40dBc and ACLR2 of less than –54dBc. 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
1920
3.0
2.7
0
1.8
0
-30
Typ
3.4
2.85
2.0
Max
1980
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 > 16dBm)
Low-Power: Vmode = 2.0V (Pout < 16dBm)
RMPA2271 Rev. B
5
www.fairchildsemi.com
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