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RMPA0951A-102 Datasheet PDF : 15 Pages
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RMPA0951A-102
3V Cellular CDMA Power Amplifier Module
DC Power
Management
for Reduced-Power
Operating Modes
PRODUCT INFORMATION
Many Cellular/PCS handsets can benefit from gain control and DC power management to optimize transmitter
performance while operating at backed-off output power levels. Oftentimes, cellular systems will operate at 10-20
dB back-off from maximum-rated linear power and peak power-added efficiency. The ability to reduce current
consumption under these conditions, without sacrificing linearity, is critical to extending battery life in next-
generation mobile phones.
The RMPA0951A-102 PA offers the ability to lower quiescent current by more than 60 percent and small-signal
gain by 10-12 dB using a single control voltage (Vref). Even with the amplifier biased for lowest current
consumption, high linearity is maintained over the full operating temperature range and at output power levels up
to +16 dBm. Bias and gain control through Vref provides complete flexibility for the handset designer, allowing the
user to define the operation by either an analog (continuously-variable) or digital (discrete-step) voltage input. As
an example, reducing the Vref voltage from 3.0V (nominal) to 2.2V can lower PA current consumption by more
than 20 percent at an output power of +12 dBm.
The following charts demonstrate analog and digital control techniques for minimizing DC power consumption at
reduced RF output power levels. Figures 14 through 17 characterize analog control over a reference voltage (Vref)
range of 1.8V to 3.0V. Using analog bias control, quiescent current is reduced to less than 30 mA and small-signal
gain is reduced by 12 dB at Vref=1.8V. Operating current at +12 dBm is also reduced by 20 percent (25 mA) at
Vref=2.2V and by more than 50 percent (50 mA) at the lowest reference voltage (Vref=1.8V) compared with fixed-
bias operation at Vref=3.0V. In all cases, DC current savings is achieved while fully complying with
IS-95 linearity requirements.
Figures 18 through 22 feature digital control performance using three discrete voltage levels (3.0V, 2.2V, 1.8V) to
optimize linear PA performance over three output power ranges (< +4 dBm, +4 dBm to +16 dBm, >+16 dBm).
Alternate output power ranges can be selected depending on the power-probability use in the cellular system.
Figure 13
Cellular PAM-Digital
Control Mode
Parameter
Low-Power Range
Current
Gain
Linearity
Mid-Power Range
Current
Gain
Linearity
High-Power Range
Current
Gain
Linearity
Min
Typical
Max
+8
50
24
-50
+8
+12
+16
120
28.5
-50
+16
+28
540
32.5
-38
Units
dBm
mA
dB
dBc
Conditions
Vref=1.8 V typ.
dBm Vref=2.2 V typ.
mA
dB
dBc
dBm Vref=3.0 V typ.
mA Pout=+28 dBm
dB
dBc
www.raytheonrf.com
Characteristic performance data and specifications are subject to change without notice.
Revised March 29, 2002
Page 10
Raytheon RF Components
362 Lowell Street
Andover, MA 01810
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