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參數(shù)資料
| 型號(hào)： | RMPA1951-102 |
| 廠商： | Raytheon Company |
| 英文描述： | 3V PCS CDMA Power Amplifier Module |
| 中文描述： | 3V的個(gè)人通訊CDMA功放模塊 |
| 文件頁數(shù)： | 9/17頁 |
| 文件大?。?/td> | 200K |
| 代理商： | RMPA1951-102 |
Raytheon RF Components
362 Lowell Street
Andover, MA 01810
Revised August 27, 2001
Page 9
www.raytheon.com/micro
Characteristic performance data and specifications are subject to change without notice.
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.
Parameter
Low-Power Range
Current
Gain
Linearity
Mid-Power Range
Current
Gain
Linearity
High-Power Range
Current
Gain
Linearity
Symbol
P04
Icc4
G4
ACPR4
P16
Icc16
G16
ACPR16
P28
Icc28
G28
ACPR28
Min
Typical
Max
+4
55
Units
dBm
mA
dB
dBc
dBm
mA
dB
dBc
dBm
mA
dB
dBc
Conditions
Vref=1.7V typ
12.5
-50
+10
+4
+16
160
Vref=2.0V typ
20
-50
+16
+28
640
Vref=2.7V typ
Pout=+28 dBm
560
26
-50
DC Power
Management
Application of Digital
Control Technique
RMPA1951-102
3V PCS CDMA Power
Amplifier Module
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