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參數(shù)資料
| 型號(hào)： | RF3133 |
| 廠商： | RF Monolithics, Inc. |
| 英文描述： | QUAD-BAND GSM850/GSM/DCS/PCS POWER AMP MODULE |
| 中文描述： | 四頻GSM850/GSM/DCS/PCS功率放大器模塊 |
| 文件頁(yè)數(shù)： | 11/16頁(yè) |
| 文件大小： | 196K |
| 代理商： | RF3133 |
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2-469
RF3133
Rev A4 030527
Talk time and power management are key concerns in transmitter design since the power amplifier has the highest cur-
rent draw in a mobile terminal. Considering only the power amplifier’s efficiency does not provide a true picture for the
total system efficiency. It is important to consider effective efficiency which is represented by
η
EFF
.
(η
EFF
considers the
loss between the PA and antenna and is a more accurate measurement to determine how much current will be drawn in
the application).
η
EFF
is defined by the following relationship (Equation 2):
m
∑
-------------------------------- 100
=
(Eq. 2)
Where P
N
is the sum of all positive and negative RF power, P
IN
the input power and P
DC
is the delivered DC power. In dB
the formula becomes (Equation 3):
P
P
+
10
V
BAT
I
BAT
10
(Eq. 3)
Where P
PA
is the output power from the PA, P
LOSS
the insertion loss, P
IN
the input power to the PA and P
DC
the deliv-
ered DC power.
The RF3133 improves the effective efficiency by minimizing the P
LOSS
term in the equation. A directional coupler may
introduce 0.4dB to 0.5dB loss to the transit path. To demonstrate the improvement in effective efficiency consider the fol-
lowing example:
Conventional PA Solution:
RF3133 Solution:
The RF3133 solution improves effective efficiency 5%.
Output power does not vary due to supply voltage under normal operating conditions if V
RAMP
is sufficiently lower than
V
BATT
. By regulating the collector voltage to the PA the voltage sensitivity is essentially eliminated. This covers most
cases where the PA will be operated. However, as the battery discharges and approaches its lower power range the
maximum output power from the PA will also drop slightly. In this case it is important to also decrease V
RAMP
to prevent
the power control from inducing switching transients. These transients occur as a result of the control loop slowing down
and not regulating power in accordance with V
RAMP
.
η
EFF
P
N
P
IN
–
n
P
DC
η
EFF
10
-----------------------------
P
IN
10
-------
=
P
PA
= +33 dBm
P
IN
= +2 dBm
P
LOSS
= -0.4 dB
V
BAT
= 3.5 V
I
BAT
= 1.1 A
η
EFF
= 47.2%
P
PA
= +33 dBm
P
IN
= +2 dBm
P
LOSS
= 0 dB
V
BAT
= 3.5 V
I
BAT
= 1.1 A
η
EFF
= 51.72%
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