RMPA0959-108 Raytheon RF Components, RMPA0959-108 Datasheet - Page 10

• Manufacturer Part Number: RMPA0959-108
• Description: Type = Cellular Power Amplifier ;; Circuit Description = 3V Cellular Band Amps, Cdma & CDMA2000 Power Amplifier Module ;; Frequency = 824-849 MHZ
• Manufacturer: Raytheon RF Components

RF Components
www.raytheonrf.com
Efficiency
Improvement
Application
Specifications are based on most current or latest revision.
Revised April 16, 2003
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 +16 dBm. 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 +16 dBm output power and over a range of supply voltages 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 –52 dBc and ACPR2 of less than –61 dBc.
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 +8 dBm output power. Excellent signal linearity is still
maintained even under this low supply voltage condition.
RMPA0959-108
CDMA and CDMA2000-1X Power Amplifier Module
24.0
22.0
20.0
18.0
16.0
14.0
12.0
10.0
-40.0
-42.0
-44.0
-46.0
-48.0
-50.0
-52.0
-54.0
-56.0
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
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
Vref = 2.85V, Pout = 16dBm, Vmode = 2.0V
Vref = 2.85V, Pout = 16dBm, Vmode = 2.0V
RMPA0959-108
RMPA0959-108
Vcc (V)
Vcc (V)
Page 10
30.0
28.0
26.0
24.0
22.0
20.0
-50.0
-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
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
Vref = 2.85V, Pout = 16dBm, Vmode = 2.0V
Vref = 2.85V, Pout = 16dBm, Vmode = 2.0V
RMPA0959-108
RMPA0959-108
ADVANCED INFORMATION
Vcc (V)
Vcc (V)
Raytheon RF Components
Andover, MA 01810
362 Lowell Street