RMPA0959 データシートの表示（PDF） - Fairchild Semiconductor
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RMPA0959 Datasheet PDF : 13 Pages
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Typical Characteristics (Continued)
RMPA0959 Cellular 4x4 PAM, Pout = 16dBm, IS95 mod.
Vcc = 3.4V, Vref = 2.85V, Vmode = 2.0V, Tc = 25C,
-70.0
-72.0
-74.0
-76.0
-78.0
-80.0
824
836.5
849
Frequency (MHz)
RMPA0959 Cellular 4x4 PAM
Frequency = 836.5MHz, Vcc = 3.4V, Vref = 2.85V
500
450
400
350
300
250
Vmode = 0V
Vmode = 2.0V
200
150
100
50
0
0.0
4.0
8.0 12.0 16.0 20.0 24.0 28.0
Pout (dBm)
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 frequently 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.
The following charts show measured performance of the
PA module in low-power mode (Vmode = +2.0V) at
+16dBm output power and over a range of supply voltages
from 3.4V nominal down to 1.5V over temp. Power-added
efficiency is more than doubled from 9.5 percent to nearly
20 percent (Vcc = 1.5V) 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. The PA module can be biased at a supply
voltage of as low as 0.7V with an efficiency as high as 10-
12 percent at +8dBm output power. Excellent signal
linearity is still maintained even under this low supply
voltage condition.
RMPA0959
Vref = 2.85V, Pout = 16dBm, Vmode = 2.0V
24.0
22.0
20.0
18.0
16.0
14.0
12.0
10.0
8.0
6.0
1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6
Vcc (V)
RMPA0959
Vref = 2.85V, Pout = 16dBm, Vmode = 2.0V
-40.0
-42.0
-44.0
-46.0
-48.0
-50.0
-52.0
-54.0
-56.0
1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6
Vcc (V)
RMPA0959
Vref = 2.85V, Pout = 16dBm, Vmode = 2.0V
30.0
28.0
26.0
24.0
22.0
20.0
1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6
Vcc (V)
-50.0
RMPA0959
Vref = 2.85V, Pout = 16dBm, Vmode = 2.0V
-55.0
-60.0
-65.0
-70.0
-75.0
-80.0
1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6
Vcc (V)
RMPA0959 Rev. F
5
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