RMPA1951-102(2001) Ver la hoja de datos (PDF) - Raytheon Company
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RMPA1951-102 Datasheet PDF : 17 Pages
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RMPA1951-102
3V PCS CDMA Power
Amplifier Module
ADVANCED INFORMATION
DC Power
Management
for Reduced-Power
Operating Modes
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 handheld phones.
The RMPA1951-102 PA offers the ability to lower quiescent current by more than 60 percent and small-signal gain
by up to 10 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 2.7V (nominal) to 1.7V (minimum) can lower PA current consumption by more than
20 percent at an output power of +16 dBm.
The following charts demonstrate analog and digital control techniques for minimizing DC power consumption at
reduced RF output power levels. Figures 11 through 19 characterize analog control over a reference voltage (Vref)
range of 1.7V to 2.7V. Quiescent current is reduced to less than 30 mA and small-signal gain is reduced by 10 dB at
Vref=1.7V. Operating current at +16 dBm is also reduced by 20 percent, or 35 mA, at the lowest reference voltage.
Figures 20 through 23 feature digital control using three discrete voltage levels (2.7V, 2.0V, 1.7V) 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.
DC Power
Management
Application of Digital
Control Technique
Parameter
Low-Power Range
Current
Gain
Linearity
Mid-Power Range
Current
Gain
Linearity
High-Power Range
Current
Gain
Linearity
Symbol
Min Typical
Max
Units
Conditions
P04
Icc4
G4
ACPR4
+4
dBm
Vref=1.7V typ
55
mA
12.5
dB
-50
dBc
P16
+4
+10
Icc16
G16
20
ACPR16
-50
+16
dBm
Vref=2.0V typ
160
mA
dB
dBc
P28
+16
Icc28
560
G28
26
ACPR28
-50
+28
dBm
Vref=2.7V typ
640
mA
Pout=+28 dBm
dB
dBc
www.raytheon.com/micro
Characteristic performance data and specifications are subject to change without notice.
Revised May 10, 2001
Page 9
Raytheon RF Components
362 Lowell Street
Andover, MA 01810
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